Water Information Reporting
Copyright © Government of Western Australia
Information supplied by the Department of Water and Environmental Regulation is protected by the Copyright Act 1968. That copyright belongs to the State of Western Australia.
Apart from any fair dealing for the purpose of private study, research, criticism or review, as permitted under the Copyright Act 1968, no part may be
reproduced or reused for any purpose without the written permission of the Department of Water and Environmental Regulation. Please click on the Copyright
link for full details.
Disclaimer / limitation of liability
The information contained herein is provided by the Department of Water and Environmental Regulation in good faith as a public service.
However, the Department does not guarantee the accuracy of this information, and it is the responsibility of recipients to make their own enquiries
as to its accuracy, currency and appropriateness. Telemetered data is provisional only and has not been verified for accuracy. If any aspect of this information is of significance to you, you should
discuss your particular circumstances with the Department. Please click on the Disclaimer
link for full details.
Should you require further information or technical assistance, please contact one of our water information officers.
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 1995
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 [ ] [ ] [ ] [ ] [ ] 7.844& 38.46 " 189.6 # 61.55 & 24.45 " 29.03 " 3.241& 1
2 [ ] [ ] [ ] [ ] [ ] 10.10 & 36.20 " 156.2 # 96.42 & 22.44 " 21.29 " 2.969& 2
3 [ ] [ ] [ ] [ ] [ ] 8.749& 32.47 " 136.4 # 160.7 # 21.58 " 15.68 " 2.622& 3
4 [ ] [ ] [ ] [ ] [ ] 7.882& 29.87 " 117.7 # 160.7 # 21.68 " 13.75 & 2.107& 4
5 [ ] [ ] [ ] [ ] [ ] 10.60 & 33.23 " 99.45 & 117.0 # 20.77 " 10.68 & 1.703& 5
6 [ ] [ ] [ ] [ ] [ ] 40.39 " 58.58 & 81.74 & 149.5 # 20.64 " 9.203& 1.394& 6
7 [ ] [ ] [ ] [ ] [ ] 62.49 & 47.00 " 72.32 & 125.7 # 20.50 " 9.349& 1.108& 7
8 [ ] [ ] [ ] [ ] [ ] 111.1 & 95.41 & 90.61 & 105.1 # 18.38 " 14.42 & 0.984& 8
9 [ ] [ ] [ ] [ ] [ ] 140.8 # 159.1 # 383.4 $ 105.6 & 27.72 " 15.96 " 0.871& 9
10 [ ] [ ] [ ] [ ] [ ] 69.21 & 107.9 & 197.0 # 77.53 & 23.08 " 12.66 & 0.698& 10
11 [ ] [ ] [ ] [ ] [ ] 51.31 " 183.2 & 152.4 # 68.07 & 32.03 " 10.09 & 0.507& 11
12 [ ] [ ] [ ] [ ] 0.000& 48.04 " 215.0 # 183.5 # 65.49 & 28.63 " 8.470& 0.367& 12
13 [ ] [ ] [ ] [ ] 0.000& 50.85 " 171.2 # 202.3 # 57.81 " 20.98 " 7.168& 0.401& 13
14 [ ] [ ] [ ] [ ] 0.000& 48.97 " 130.3 # 144.7 # 58.90 & 16.48 " 6.520& 0.383& 14
15 [ ] [ ] [ ] [ ] 0.000& 42.02 " 145.2 # 122.6 # 55.85 " 14.11 " 5.827& 0.239& 15
16 [ ] [ ] [ ] [ ] 0.000& 36.43 " 146.3 # 117.1 # 51.49 " 13.24 & 5.177& 0.215& 16
17 [ ] [ ] [ ] [ ] 0.354& 32.32 " 121.5 # 157.2 # 49.84 " 31.72 & 4.467& 0.179& 17
18 [ ] [ ] [ ] [ ] 1.426& 28.47 " 103.8 # 117.3 # 53.84 " 67.45 & 3.997& 0.145& 18
19 [ ] [ ] [ ] [ ] 1.006& 25.44 " 203.9 # 134.5 # 50.04 " 40.18 " 3.707& 0.110& 19
20 [ ] [ ] [ ] [ ] 1.029& 34.36 " 340.4 $ 148.3 # 47.92 " 25.82 " 3.352& 0.089& 20
21 [ ] [ ] [ ] [ ] 1.473& 32.20 " 232.6 # 128.5 # 43.54 " 19.14 " 2.970& 0.141& 21
22 [ ] [ ] [ ] [ ] 3.628& 30.65 " 158.1 # 122.0 # 41.96 " 15.76 " 2.680& 0.849& 22
23 [ ] [ ] [ ] [ ] 8.166& 41.99 " 130.5 # 114.2 # 39.53 " 13.87 & 2.517& 1.906& 23
24 [ ] [ ] [ ] [ ] 10.78 & 38.75 " 315.1 $ 122.2 # 36.72 " 12.27 & 2.408& 4.231& 24
25 [ ] [ ] [ ] [ ] 8.582& 45.35 " 426.4 $ 100.0 # 34.38 " 11.07 & 3.251& 2.733& 25
26 [ ] [ ] [ ] [ ] 6.528& 44.81 " 228.9 # 104.6 & 33.20 " 10.53 & 3.875& 1.763& 26
27 [ ] [ ] [ ] [ ] 5.539& 42.30 " 202.9 # 81.82 & 31.20 " 9.806& 4.076& 1.171& 27
28 [ ] [ ] [ ] [ ] 11.48 & 36.15 " 334.1 $ 69.82 & 29.42 " 8.897& 3.478& 1.069& 28
29 [ ] [ ] [ ] 10.71 & 34.80 " 951.3 $ 66.48 & 26.92 " 8.399& 2.958& 1.267& 29
30 [ ] [ ] [ ] 8.129& 39.80 " 312.7 $ 63.06 & 25.88 " 16.16 & 3.031& 0.962& 30
31 [ ] [ ] 7.189& 226.3 # 64.26 & 17.78 " 0.652& 31
Mean [ ] [ ] [ ] [ ] 4.301& 41.80 & 190.9 & 130.4 & 68.72 & 21.15 & 8.068& 1.196&
Median [ ] [ ] [ ] [ ] 2.551& 39.27 & 158.1 & 122.0 & 54.85 & 20.50 & 5.502& 0.962&
Maximum [ ] [ ] [ ] [ ] 11.48 & 140.8 & 951.3 & 383.4 & 160.7 & 67.45 & 29.03 & 4.231&
Minimum [ ] [ ] [ ] [ ] 0.000& 7.844& 29.87 & 63.06 & 25.88 & 8.399& 2.408& 0.089&
Total [ ] [ ] [ ] [ ] 86.02 &1254 &5918 &4041 &2062 & 655.6 & 242.0 & 37.08 &
Missing Days 31 28 31 30 11 0 0 0 0 0 0 0
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 61.09 & " ... Relative Uncertainty +/-10%
Ann. Median 29.23 & # ... Relative Uncertainty +/-15%
Annual Total 14296 & $ ... Relative Uncertainty +/-20%
Missing Days 131 & ... Relative Uncertainty +/-30%
[ ... Not Available
Maximum Minimum
Daily 951.3 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 1996
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.356& 0.000& 0.000& 0.000& 0.000& 2.711& 110.2 & 863.5 $ 114.5 # 80.56 & 27.89 " 7.769& 1
2 0.162& 0.000& 0.000& 0.000& 0.000& 2.021& 97.05 & 366.8 $ 99.11 & 66.18 & 25.17 " 7.155& 2
3 0.082& 0.000& 0.000& 0.000& 0.000& 1.732& 162.8 # 474.5 $ 131.9 & 61.20 " 22.55 " 6.678& 3
4 0.047& 0.000& 0.000& 0.000& 0.000& 1.915& 170.8 # 563.1 $ 92.25 & 58.90 " 20.40 " 6.437& 4
5 0.020& 0.000& 0.000& 0.000& 0.000& 1.717& 132.5 # 362.1 $ 83.89 & 51.85 " 18.50 " 6.282& 5
6 0.009& 0.000& 0.000& 0.000& 0.000& 1.551& 115.7 # 211.6 # 152.1 # 49.25 " 17.31 " 5.220& 6
7 0.003& 0.000& 0.000& 0.000& 0.000& 1.422& 777.7 $ 193.8 # 117.3 # 47.98 " 18.95 " 4.386& 7
8 0.000& 0.000& 0.000& 0.000& 0.000& 1.430& 588.6 $ 166.6 # 126.6 # 46.77 " 16.59 " 3.700& 8
9 0.000& 0.000& 0.000& 0.000& 0.000& 1.754& 204.9 # 153.6 # 136.6 # 46.28 " 14.65 " 2.969& 9
10 0.000& 0.000& 0.000& 0.000& 0.000& 2.460& 153.3 # 257.0 $ 503.0 $ 55.61 " 13.59 & 2.535& 10
11 0.000& 0.000& 0.000& 0.000& 0.000& 4.010& 124.0 # 281.6 $ 295.1 $ 52.89 " 12.42 & 3.126& 11
12 0.000& 0.000& 0.000& 0.000& 0.175& 9.566& 112.2 # 207.5 # 176.2 # 46.10 " 11.89 & 51.63 & 12
13 0.000& 0.000& 0.000& 0.000& 0.328& 7.508& 97.82 & 225.7 # 148.6 # 42.36 " 11.82 & 26.92 " 13
14 0.000& 0.000& 0.000& 0.000& 0.299& 5.167& 73.98 & 216.1 # 160.6 # 40.64 " 11.19 & 16.97 " 14
15 0.000& 0.000& 0.000& 0.000& 0.301& 9.728& 78.66 & 223.5 # 245.8 # 39.63 " 25.66 & 11.75 & 15
16 0.000& 0.000& 0.000& 0.000& 0.298& 19.66 & 158.8 # 169.8 # 197.6 # 36.73 " 26.19 " 8.618& 16
17 0.000& 0.000& 0.000& 0.000& 0.318& 34.76 & 280.7 # 145.0 # 150.3 # 35.27 " 17.52 " 6.880& 17
18 0.000& 0.000& 0.000& 0.000& 0.362& 106.8 & 324.6 $ 125.6 # 131.6 # 34.49 " 14.09 & 5.609& 18
19 0.000& 0.000& 0.000& 0.000& 0.291& 81.96 & 185.6 # 109.4 # 111.9 # 32.36 " 12.07 & 4.587& 19
20 0.000& 0.000& 0.000& 0.000& 0.314& 116.9 & 155.8 # 156.0 # 92.10 & 29.30 " 10.75 & 3.881& 20
21 0.000& 0.000& 0.000& 0.000& 0.342& 192.8 # 367.2 $ 148.8 # 99.96 & 70.52 & 9.513& 2.968& 21
22 0.000& 0.000& 0.000& 0.000& 0.448& 125.5 & 489.9 $ 152.7 # 283.5 $ 94.89 & 8.322& 2.496& 22
23 0.000& 0.000& 0.000& 0.000& 0.512& 113.7 & 327.0 $ 185.9 # 153.9 # 187.1 # 7.914& 2.513& 23
24 0.000& 0.000& 0.000& 0.000& 0.476& 98.42 & 651.6 $ 456.1 $ 125.6 # 99.85 & 8.694& 2.232& 24
25 0.000& 0.000& 0.000& 0.000& 0.364& 69.11 & 259.5 $ 201.5 # 102.4 & 58.69 & 7.523& 1.929& 25
26 0.000& 0.000& 0.000& 0.000& 0.330& 68.40 & 210.7 # 187.5 # 108.9 & 50.56 " 6.813& 1.758& 26
27 0.000& 0.000& 0.000& 0.000& 0.311& 116.1 & 706.7 $ 213.5 # 184.4 # 46.34 " 6.335& 1.466& 27
28 0.000& 0.000& 0.000& 0.000& 0.305& 103.8 & 414.2 $ 184.4 # 144.0 # 42.20 " 6.100& 1.094& 28
29 0.000& 0.000& 0.000& 0.000& 0.346& 89.02 & 694.7 $ 153.1 # 115.0 # 37.95 " 5.634& 1.172& 29
30 0.000& 0.000& 0.000& 0.355& 128.4 #1122 $ 136.5 # 96.46 & 34.94 " 6.046& 1.184& 30
31 0.000& 0.000& 3.745& 821.4 $ 142.5 # 30.36 " 0.962& 31
Mean 0.022& 0.000& 0.000& 0.000& 0.330& 50.66 & 328.1 & 246.3 $ 156.0 & 55.09 & 14.07 & 6.867&
Median 0.000& 0.000& 0.000& 0.000& 0.301& 14.69 & 204.9 & 193.8 $ 131.7 & 46.77 & 12.25 & 3.881&
Maximum 0.356& 0.000& 0.000& 0.000& 3.745& 192.8 &1122 & 863.5 $ 503.0 & 187.1 & 27.89 & 51.63 &
Minimum 0.000& 0.000& 0.000& 0.000& 0.000& 1.422& 73.98 & 109.4 $ 83.89 & 29.30 & 5.634& 0.962&
Total 0.68& 0.00& 0.00& 0.00& 10.22& 1520 &10170 & 7635 $ 4681 & 1708 & 422.1 & 212.9 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 72.02 & " ... Relative Uncertainty +/-10%
Ann. Median 5.414& # ... Relative Uncertainty +/-15%
Annual Total 26360 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 1122 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 1997
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.729& 0.000& 0.992& 0.102& 0.960& 19.09 " 38.92 " 54.08 " 78.63 & 47.14 " 6.821& 5.425& 1
2 0.603& 0.000& 0.938& 0.073& 0.760& 25.11 " 34.98 " 50.61 " 90.24 & 42.12 " 6.500& 4.434& 2
3 0.432& 0.000& 0.785& 0.052& 0.842& 27.88 " 34.13 " 74.34 & 89.29 & 38.94 " 6.182& 3.776& 3
4 0.288& 0.000& 0.576& 0.035& 0.691& 25.40 " 33.41 " 742.5 $ 67.63 & 36.87 " 5.576& 3.382& 4
5 0.208& 0.000& 0.397& 0.025& 0.661& 22.88 " 33.18 " 324.9 $ 78.12 & 34.08 " 5.469& 3.041& 5
6 0.176& 0.000& 0.303& 0.027& 0.497& 21.41 " 49.72 " 202.1 # 268.7 $ 31.01 " 4.938& 2.683& 6
7 0.141& 0.000& 0.242& 0.018& 0.377& 16.53 " 51.07 " 177.0 # 138.6 # 28.06 " 4.237& 2.394& 7
8 0.110& 0.000& 0.192& 0.008& 0.323& 29.48 & 52.32 & 192.9 # 112.9 # 27.68 " 3.964& 2.098& 8
9 0.086& 0.000& 0.171& 0.002& 0.304& 59.71 & 98.56 & 249.3 # 136.7 # 39.64 " 3.766& 1.825& 9
10 0.062& 0.000& 0.166& 0.000& 0.339& 47.06 " 54.34 " 207.3 # 172.8 # 48.44 " 3.436& 1.558& 10
11 0.039& 0.000& 0.161& 0.025& 0.341& 49.20 " 49.47 " 162.5 # 143.4 # 35.46 " 3.277& 1.421& 11
12 0.026& 0.000& 0.139& 0.101& 0.516& 44.29 " 47.58 " 136.1 # 185.6 # 29.99 " 3.102& 1.304& 12
13 0.019& 0.000& 0.132& 0.079& 0.628& 36.98 " 193.7 & 118.0 # 138.6 # 27.36 " 3.088& 1.139& 13
14 0.008& 0.000& 0.109& 0.048& 0.561& 31.17 " 146.4 # 142.0 # 108.4 # 24.52 " 3.055& 1.024& 14
15 0.003& 0.000& 0.121& 0.028& 0.538& 26.36 " 93.89 & 188.9 # 85.39 & 22.74 " 2.918& 0.923& 15
16 0.001& 0.000& 0.377& 0.016& 0.675& 24.14 " 66.72 & 131.9 # 68.94 & 20.69 " 2.601& 1.041& 16
17 0.000& 0.000& 0.694& 0.013& 2.369& 22.11 " 56.79 " 99.09 & 59.91 " 17.53 " 2.233& 1.150& 17
18 0.000& 0.000& 0.453& 0.008& 8.780& 27.74 & 51.41 " 79.70 & 57.68 " 15.88 " 1.956& 1.086& 18
19 0.000& 0.000& 0.345& 0.005& 6.796& 320.8 $ 47.99 " 89.66 & 81.90 & 14.55 " 1.765& 0.976& 19
20 0.000& 0.000& 0.265& 0.016& 4.422& 283.7 $ 44.77 " 92.42 & 85.35 & 13.25 & 4.511& 0.835& 20
21 0.000& 0.000& 0.214& 0.095& 3.415& 172.5 # 42.48 " 76.14 & 63.22 & 12.12 & 56.30 & 0.718& 21
22 0.000& 0.000& 0.164& 0.133& 2.709& 141.4 # 40.19 " 65.22 & 53.56 " 11.53 & 27.79 " 0.546& 22
23 0.000& 0.000& 0.154& 0.123& 7.842& 116.8 # 38.04 " 57.08 " 55.45 " 11.40 & 12.51 & 0.378& 23
24 0.000& 0.014& 0.157& 0.108& 7.505& 83.24 & 141.9 & 52.79 " 58.23 " 11.15 & 9.207& 0.219& 24
25 0.000& 3.581& 0.197& 0.094& 13.42 & 67.20 & 156.6 # 50.12 " 51.44 " 11.41 & 7.724& 0.162& 25
26 0.000& 2.530& 0.199& 0.092& 8.330& 55.46 " 97.91 & 48.76 " 51.42 " 10.26 & 7.285& 0.136& 26
27 0.000& 1.823& 0.130& 0.170& 7.168& 50.80 " 128.2 # 85.06 & 48.43 " 10.50 & 6.206& 0.132& 27
28 0.000& 1.262& 0.106& 0.190& 6.122& 47.62 " 84.28 & 120.2 # 46.74 " 9.481& 10.10 & 0.143& 28
29 0.000& 0.099& 0.129& 5.140& 44.67 " 84.52 & 89.95 & 47.10 " 8.424& 7.711& 0.093& 29
30 0.000& 0.089& 0.319& 6.472& 42.40 " 82.07 & 63.50 & 44.24 " 7.463& 6.186& 0.059& 30
31 0.000& 0.079& 27.43 " 61.30 & 55.51 " 6.980& 0.046& 31
Mean 0.095& 0.329& 0.295& 0.071& 4.095& 66.10 & 72.16 & 138.0 & 92.29 & 22.80 & 7.680& 1.424&
Median 0.001& 0.000& 0.192& 0.050& 0.960& 43.35 & 52.32 & 92.42 & 78.37 & 20.69 & 5.203& 1.041&
Maximum 0.729& 3.581& 0.992& 0.319& 27.43 & 320.8 & 193.7 & 742.5 & 268.7 & 48.44 & 56.30 & 5.425&
Minimum 0.000& 0.000& 0.079& 0.000& 0.304& 16.53 & 33.18 & 48.76 & 44.24 & 6.980& 1.765& 0.046&
Total 2.932& 9.210& 9.142& 2.134& 126.9 &1983 &2237 &4279 &2769 & 706.6 & 230.4 & 44.15 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 33.97 & " ... Relative Uncertainty +/-10%
Ann. Median 4.434& # ... Relative Uncertainty +/-15%
Annual Total 12400 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 742.5 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 1998
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.035& 0.000& 0.000& 0.323& 0.677& 4.406& 56.72 " 381.9 $ 305.9 $ 122.7 # 12.92 & 3.563& 1
2 0.026& 0.000& 0.000& 0.229& 0.588& 7.941& 51.62 " 192.9 # 400.3 $ 125.6 # 13.32 & 4.019& 2
3 0.017& 0.000& 0.000& 0.172& 0.488& 8.212& 52.40 & 165.4 # 221.4 # 81.09 & 12.67 & 3.820& 3
4 0.016& 0.000& 0.000& 0.152& 0.465& 14.73 & 94.33 & 136.3 # 173.0 # 66.05 & 11.79 & 3.386& 4
5 0.010& 0.000& 0.000& 0.213& 0.547& 25.19 " 88.62 & 145.4 # 141.5 # 59.89 " 11.34 & 2.452& 5
6 0.005& 0.000& 0.000& 0.195& 0.481& 12.31 & 113.9 & 133.7 # 120.6 # 55.11 " 12.35 & 1.926& 6
7 0.002& 0.000& 0.000& 0.206& 0.812& 18.24 & 89.15 & 143.1 # 100.2 & 50.46 " 10.85 & 1.575& 7
8 0.000& 0.000& 0.000& 0.226& 1.137& 99.44 & 68.56 & 122.9 # 80.15 & 47.66 " 9.737& 1.304& 8
9 0.000& 0.000& 0.000& 0.384& 9.729& 57.18 & 58.14 " 96.58 & 67.00 & 45.42 " 8.922& 1.118& 9
10 0.000& 0.000& 0.000& 1.124& 7.452& 134.2 & 53.11 " 125.5 & 81.24 & 43.05 " 8.209& 0.971& 10
11 0.000& 0.000& 0.000& 1.283& 4.456& 89.33 & 51.80 " 135.5 # 64.63 & 43.58 " 7.571& 0.950& 11
12 0.000& 0.000& 0.000& 1.103& 3.410& 52.47 " 48.21 " 98.60 & 80.00 & 42.03 " 7.182& 0.940& 12
13 0.000& 0.000& 0.000& 0.780& 2.964& 61.80 & 45.40 " 75.04 & 79.87 & 43.81 " 7.414& 0.791& 13
14 0.000& 0.000& 0.000& 0.519& 2.637& 46.68 " 42.96 " 62.58 & 57.88 " 42.43 " 9.352& 0.614& 14
15 0.000& 0.000& 0.000& 0.379& 2.399& 40.68 " 41.12 " 59.84 & 54.30 " 38.76 " 7.767& 0.787& 15
16 0.000& 0.000& 0.000& 0.407& 2.323& 43.07 & 39.33 " 125.6 # 51.73 " 54.30 & 6.483& 0.778& 16
17 0.000& 0.000& 0.000& 0.386& 2.262& 101.8 & 44.64 " 93.38 & 75.48 & 49.93 " 5.929& 0.547& 17
18 0.000& 0.000& 0.000& 0.468& 3.623& 79.47 & 84.51 & 140.6 & 57.97 & 44.81 " 6.753& 0.360& 18
19 0.000& 0.000& 0.000& 0.460& 3.537& 68.55 & 71.12 & 123.6 # 51.65 " 38.28 " 6.198& 0.262& 19
20 0.000& 0.000& 0.000& 0.542& 3.196& 59.23 " 58.19 " 91.56 & 50.23 " 32.80 " 5.787& 0.197& 20
21 0.000& 0.000& 2.101& 0.629& 5.609& 50.62 " 129.0 & 78.07 & 131.6 & 30.07 " 5.216& 0.165& 21
22 0.000& 0.000& 2.602& 0.747& 7.199& 48.82 " 122.4 # 64.02 & 148.9 # 28.45 " 4.911& 0.148& 22
23 0.000& 0.000& 1.773& 1.061& 4.704& 61.09 & 79.12 & 66.81 & 91.26 & 25.54 " 5.183& 0.176& 23
24 0.000& 0.000& 1.316& 0.992& 3.836& 48.29 " 63.58 & 96.56 & 79.76 & 23.98 " 4.604& 0.192& 24
25 0.000& 0.000& 1.072& 0.898& 3.547& 166.0 & 69.60 & 63.14 & 110.5 & 24.38 " 4.248& 0.201& 25
26 0.000& 0.000& 1.237& 0.853& 5.780& 176.4 # 94.24 & 56.55 " 88.07 & 21.88 " 3.980& 0.161& 26
27 0.000& 0.000& 1.244& 0.700& 7.594& 163.4 # 69.11 & 201.2 & 136.9 # 18.86 " 3.513& 0.115& 27
28 0.000& 0.000& 0.849& 0.679& 8.527& 122.1 # 57.71 " 137.2 # 86.87 & 16.99 " 3.265& 0.082& 28
29 0.000& 0.644& 0.643& 6.808& 82.13 & 52.49 " 448.6 $ 75.04 & 16.12 " 2.897& 0.047& 29
30 0.000& 0.513& 0.612& 5.059& 63.77 & 49.12 " 321.0 $ 132.2 & 14.62 " 2.517& 0.029& 30
31 0.000& 0.411& 4.264& 737.2 & 187.1 # 13.36 & 0.020& 31
Mean 0.004& 0.000& 0.444& 0.579& 3.745& 66.92 & 89.59 & 141.0 & 113.2 & 43.94 & 7.429& 1.022&
Median 0.000& 0.000& 0.000& 0.530& 3.537& 58.20 & 58.19 & 125.5 & 84.06 & 42.43 & 6.968& 0.614&
Maximum 0.035& 0.000& 2.602& 1.283& 9.729& 176.4 & 737.2 & 448.6 & 400.3 & 125.6 & 13.32 & 4.019&
Minimum 0.000& 0.000& 0.000& 0.152& 0.465& 4.406& 39.33 & 56.55 & 50.23 & 13.36 & 2.517& 0.020&
Total 0.110& 0.000& 13.76 & 17.36 & 116.1 &2008 &2777 &4370 &3396 &1362 & 222.9 & 31.70 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 39.22 & " ... Relative Uncertainty +/-10%
Ann. Median 5.059& # ... Relative Uncertainty +/-15%
Annual Total 14315 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 737.2 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 1999
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.019& 0.000& 0.000& 0.000& 0.000& 37.37 " 102.7 & 68.53 & 104.0 & 59.30 & 27.73 " 3.710& 1
2 0.013& 0.000& 0.000& 0.000& 0.000& 56.10 & 81.60 & 61.64 & 173.2 & 49.18 " 24.94 " 4.851& 2
3 0.011& 0.000& 0.000& 0.000& 0.000& 71.58 & 257.3 & 56.58 " 190.5 # 45.63 " 22.12 " 3.874& 3
4 0.008& 0.000& 0.000& 0.000& 0.000& 50.02 " 322.4 $ 52.50 " 168.0 # 43.04 " 20.43 " 3.119& 4
5 0.027& 0.000& 0.000& 0.000& 0.843& 43.24 " 239.8 # 50.26 " 127.5 # 41.07 " 18.98 " 2.800& 5
6 0.104& 0.000& 0.000& 0.000& 6.762& 45.06 " 175.7 # 156.3 & 106.6 # 47.13 " 17.54 " 2.790& 6
7 0.074& 0.000& 0.000& 0.000& 2.964& 41.28 " 144.2 # 116.3 & 99.61 & 77.07 & 15.25 " 2.504& 7
8 0.044& 0.000& 0.000& 0.000& 1.742& 41.46 " 113.6 # 75.13 & 74.39 & 254.9 # 15.14 " 2.230& 8
9 0.019& 0.000& 0.000& 0.000& 1.407& 39.62 " 101.8 & 73.12 & 63.40 & 153.8 # 14.43 & 1.986& 9
10 0.008& 0.000& 0.000& 0.000& 3.069& 76.60 & 137.7 # 175.9 & 66.08 & 99.21 & 12.45 & 1.685& 10
11 0.002& 0.000& 0.000& 0.000& 3.498& 121.4 # 105.6 & 245.2 # 144.7 # 72.33 & 11.36 & 1.659& 11
12 0.000& 0.000& 0.000& 0.000& 2.663& 116.6 & 77.24 & 188.9 # 84.99 & 67.81 & 10.61 & 2.201& 12
13 0.000& 0.000& 0.000& 0.000& 2.279& 93.85 & 126.8 & 138.7 # 116.7 & 99.01 & 9.865& 2.415& 13
14 0.000& 0.000& 0.000& 0.000& 2.574& 224.0 # 169.7 # 108.6 # 199.7 # 230.5 # 9.316& 2.318& 14
15 0.000& 0.000& 0.000& 0.000& 7.079& 150.8 # 131.2 # 88.35 & 174.3 # 136.3 # 8.891& 1.799& 15
16 0.000& 0.000& 0.000& 0.000& 5.643& 186.2 # 178.4 # 75.51 & 122.8 # 171.4 # 8.993& 1.425& 16
17 0.000& 0.000& 0.000& 0.000& 3.693& 137.1 # 175.3 # 94.57 & 92.26 & 115.9 # 9.061& 1.099& 17
18 0.000& 0.000& 0.000& 0.000& 3.161& 201.9 # 162.6 # 111.5 # 71.93 & 81.60 & 8.538& 0.839& 18
19 0.000& 0.000& 0.000& 0.000& 10.67 & 168.5 # 158.7 # 121.8 # 62.18 & 64.84 & 8.301& 0.772& 19
20 0.000& 0.000& 0.000& 0.000& 10.51 & 137.6 # 147.0 # 88.75 & 63.33 & 56.56 " 7.686& 0.820& 20
21 0.000& 0.000& 0.000& 0.000& 8.264& 90.93 & 110.2 & 69.70 & 59.54 & 51.49 " 7.041& 0.670& 21
22 0.000& 0.000& 0.000& 0.000& 6.351& 262.9 & 82.13 & 60.73 " 54.29 " 48.29 " 6.326& 0.472& 22
23 0.000& 0.000& 0.000& 0.000& 5.171& 292.2 $ 68.12 & 55.88 " 50.81 " 46.47 " 5.771& 0.259& 23
24 0.000& 0.000& 0.000& 0.000& 4.510& 150.6 # 61.04 " 176.9 & 48.49 " 45.21 " 5.094& 0.152& 24
25 0.000& 0.000& 0.000& 0.000& 4.699& 846.7 $ 125.1 & 174.6 # 46.36 " 43.16 " 4.293& 0.110& 25
26 0.000& 0.000& 0.000& 0.000& 8.448& 507.7 $ 220.0 $ 132.3 # 49.34 " 42.71 " 4.123& 0.730& 26
27 0.000& 0.000& 0.000& 0.000& 69.12 & 205.1 # 147.5 # 115.3 # 79.27 & 39.98 " 3.964& 0.663& 27
28 0.000& 0.000& 0.000& 0.000& 64.17 & 210.6 # 148.3 # 217.8 $ 68.44 & 37.61 " 3.368& 0.205& 28
29 0.000& 0.000& 0.000& 51.94 " 166.1 # 140.8 # 285.5 $ 53.34 " 34.79 " 3.004& 0.103& 29
30 0.000& 0.000& 0.000& 39.01 " 129.5 # 113.4 # 172.8 # 67.79 & 33.54 " 3.098& 0.069& 30
31 0.000& 0.000& 35.76 " 85.25 & 130.9 # 30.83 " 0.051& 31
Mean 0.011& 0.000& 0.000& 0.000& 11.81 & 163.4 & 142.3 & 120.7 & 96.12 & 78.08 & 10.92 & 1.561&
Median 0.000& 0.000& 0.000& 0.000& 4.510& 133.3 & 137.7 & 111.5 & 76.83 & 51.49 & 9.027& 1.425&
Maximum 0.104& 0.000& 0.000& 0.000& 69.12 & 846.7 & 322.4 & 285.5 & 199.7 & 254.9 & 27.73 & 4.851&
Minimum 0.000& 0.000& 0.000& 0.000& 0.000& 37.37 & 61.04 & 50.26 & 46.36 & 30.83 & 3.004& 0.051&
Total 0.329& 0.000& 0.000& 0.000& 366.0 &4903 &4411 &3741 &2884 &2421 & 327.7 & 48.38 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 52.33 & " ... Relative Uncertainty +/-10%
Ann. Median 7.079& # ... Relative Uncertainty +/-15%
Annual Total 19101 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 846.7 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2000
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.038& 0.070& 0.000& 0.000" 0.000" 22.74 " 656.3 $ 181.3 " 180.5 " 37.49 " 11.50 " 1.395" 1
2 0.029& 0.039& 0.000& 0.000" 0.110" 14.02 " 393.5 $ 322.1 $ 157.0 " 34.41 " 9.948" 0.801" 2
3 0.018& 0.020& 0.000& 0.000" 0.773" 10.24 " 250.0 $ 196.9 " 121.4 " 31.61 " 8.658" 0.796" 3
4 0.010& 0.014& 0.000& 0.000" 0.831" 8.280" 570.6 $ 147.1 " 103.4 " 29.86 " 8.287" 0.685" 4
5 0.006& 0.006& 0.000& 0.000" 0.816" 6.852" 318.2 $ 161.1 " 138.4 $ 48.12 " 7.843" 0.397" 5
6 0.002& 0.001& 0.000& 0.000" 0.758" 5.864" 226.4 " 162.8 " 450.3 $ 39.90 " 7.008" 0.295" 6
7 0.000& 0.000& 0.000& 0.000" 0.742" 5.190" 186.3 " 270.9 $ 211.5 $ 39.37 " 9.015" 0.297" 7
8 0.000& 0.001& 0.000& 0.000" 1.346" 4.786" 135.3 " 175.2 " 145.8 " 42.33 " 16.70 " 0.223" 8
9 0.000& 0.080& 0.000& 0.000" 2.461" 4.497" 114.5 " 139.5 " 117.7 " 36.92 " 14.27 " 0.183" 9
10 0.000& 0.123& 0.000& 0.000" 2.714" 5.931" 229.9 $ 114.1 " 101.3 " 31.39 " 12.07 " 0.148" 10
11 0.000& 0.066& 0.000& 0.000" 5.435" 8.332" 290.2 $ 99.39 " 91.00 " 29.12 " 11.03 " 0.120" 11
12 0.000& 0.031& 0.000& 0.000" 9.294" 6.767" 167.3 " 91.62 " 98.51 " 29.49 " 9.201" 0.109" 12
13 0.000& 0.011& 0.000& 0.000" 6.074" 90.90 " 586.8 $ 113.3 " 109.7 " 27.32 " 7.178" 0.100" 13
14 0.001& 0.003& 0.000& 0.000" 4.352" 81.93 " 340.5 $ 90.36 " 89.15 " 25.65 " 4.638" 0.085" 14
15 0.094& 0.000& 0.000& 0.000" 3.823" 53.76 " 400.3 $ 112.2 " 88.43 " 24.21 " 4.098" 0.072" 15
16 1.080& 0.000& 0.000& 0.000" 3.123" 51.38 " 424.2 $ 215.1 " 75.41 " 22.18 " 3.291" 0.070" 16
17 3.585& 0.000& 0.000& 0.000" 2.681" 38.07 " 574.6 $ 163.3 " 67.48 " 19.54 " 3.628" 0.085" 17
18 2.344& 0.000& 0.000& 0.000" 2.379" 32.76 " 515.0 $ 124.0 " 63.41 " 17.20 " 3.129" 0.077" 18
19 1.384& 0.000& 0.000" 0.000" 2.227" 66.54 " 298.2 $ 124.7 " 60.78 " 15.74 " 2.734" 0.069" 19
20 0.895& 0.000& 0.000" 0.000" 2.041" 118.1 " 272.2 $ 105.1 " 56.29 " 14.95 " 2.291" 0.066" 20
21 0.595& 0.000& 0.000" 0.000" 1.934" 90.59 " 274.4 $ 87.33 " 53.11 " 16.99 " 1.714" 0.091" 21
22 0.474& 0.000& 0.000" 0.000" 1.840" 76.93 " 271.0 $ 78.51 " 49.65 " 17.61 " 1.757" 0.099" 22
23 0.477& 0.000& 0.000" 0.000" 2.190" 104.2 " 212.2 $ 83.22 " 46.52 " 16.47 " 1.219" 0.118" 23
24 0.390& 0.000& 0.000" 0.000" 4.410" 105.7 " 157.4 " 249.1 $ 43.61 " 14.76 " 1.353" 0.123" 24
25 0.220& 0.000& 0.000" 0.000" 3.358" 156.5 " 127.1 " 140.9 " 40.89 " 13.13 " 1.143" 0.109" 25
26 0.142& 0.000& 0.000" 0.000" 2.757" 129.9 " 106.8 " 222.0 $ 39.90 " 12.76 " 1.327" 0.080" 26
27 0.100& 0.000& 0.000" 0.000" 2.342" 113.5 " 100.8 " 132.2 " 49.40 " 11.65 " 1.920" 0.044" 27
28 0.066& 0.000& 0.000" 0.000" 2.083" 87.39 " 315.9 $ 166.3 " 49.27 " 11.06 " 2.668" 0.024" 28
29 0.038& 0.000& 0.000" 0.000" 1.889" 72.90 " 202.1 $ 234.1 $ 42.16 " 10.54 " 2.556" 0.040" 29
30 0.029& 0.000" 0.000" 1.618" 92.78 $ 142.8 " 223.8 $ 42.45 " 12.30 " 1.743" 0.042" 30
31 0.045& 0.000" 23.32 " 211.2 $ 279.7 $ 12.97 " 0.026" 31
Mean 0.389& 0.016& 0.000& 0.000" 3.217" 55.58 $ 292.6 $ 161.5 $ 99.48 $ 24.10 " 5.797" 0.222"
Median 0.038& 0.000& 0.000& 0.000" 2.227" 52.57 $ 271.0 $ 147.1 $ 81.92 $ 22.18 " 3.863" 0.100"
Maximum 3.585& 0.123& 0.000& 0.000" 23.32 " 156.5 $ 656.3 $ 322.1 $ 450.3 $ 48.12 " 16.70 " 1.395"
Minimum 0.000& 0.000& 0.000& 0.000" 0.000" 4.497$ 100.8 $ 78.51 $ 39.90 $ 10.54 " 1.143" 0.024"
Total 12.06 & 0.463& 0.000& 0.000" 99.72 "1667 $9072 $5007 $2984 $ 747.0 " 173.9 " 6.871"
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 54.02 & " ... Relative Uncertainty +/-10%
Ann. Median 2.724& $ ... Relative Uncertainty +/-20%
Annual Total 19771 & & ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 656.3 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2001
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.015" 0.000" 0.000" 0.000" 0.000" 5.252" 17.89 " 15.04 " 33.71 " 85.36 " 7.326" 0.264" 1
2 0.007" 0.000" 0.000" 0.000" 0.000" 4.895" 17.01 " 14.56 " 35.30 " 62.60 " 6.738" 0.195" 2
3 0.004" 0.000" 0.000" 0.000" 0.000" 4.268" 19.86 " 39.19 " 32.28 " 51.73 " 7.965" 0.206" 3
4 0.001" 0.000" 0.000" 0.000" 0.000" 4.062" 21.99 " 37.38 " 28.37 " 43.46 " 10.99 " 7.761" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 3.431" 17.24 " 26.75 " 30.05 " 37.51 " 8.862" 54.83 " 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 3.055" 15.55 " 41.22 " 38.80 " 33.30 " 7.501" 49.17 " 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 3.047" 15.06 " 35.89 " 38.29 " 29.50 " 6.055" 34.17 " 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 5.424" 52.12 " 35.84 " 31.96 " 27.85 " 5.173" 20.67 " 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 8.087" 59.34 " 102.6 " 45.07 " 27.02 " 4.285" 11.65 " 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 15.69 " 38.23 " 66.23 " 44.11 " 25.03 " 3.733" 6.670" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 22.04 " 30.92 " 56.65 " 32.56 " 26.57 " 3.299" 3.637" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 22.86 " 54.92 " 49.98 " 29.72 " 36.05 " 2.596" 2.403" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 16.66 " 38.78 " 61.17 " 27.24 " 27.25 " 2.086" 1.543" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 13.80 " 34.38 " 64.07 " 24.93 " 24.07 " 1.743" 0.765" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 12.43 " 30.37 " 51.95 " 25.79 " 20.96 " 1.865" 0.514" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 13.67 " 27.98 " 44.11 " 25.27 " 18.27 " 2.132" 0.330" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 18.15 " 24.67 " 39.41 " 23.26 " 16.46 " 4.047" 0.249" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 12.95 " 22.66 " 37.23 " 24.45 " 15.29 " 3.857" 0.245" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 12.19 " 21.48 " 37.04 " 23.76 " 14.11 " 2.799" 0.263" 19
20 0.000" 0.000" 0.000" 0.000" 0.410" 11.08 " 20.15 " 33.69 " 20.15 " 14.10 " 2.357" 0.242" 20
21 0.000" 0.000" 0.000" 0.000" 3.041" 10.30 " 21.31 " 30.53 " 18.69 " 18.92 " 1.908" 0.198" 21
22 0.000" 0.000" 0.000" 0.000" 1.988" 9.752" 19.72 " 28.28 " 51.69 " 24.69 " 1.508" 0.152" 22
23 0.000" 0.000" 0.000" 0.000" 1.569" 26.57 " 17.91 " 30.75 " 49.76 " 18.30 " 1.357" 0.127" 23
24 0.000" 0.000" 0.000" 0.000" 2.059" 22.58 " 16.42 " 35.59 " 38.75 " 15.69 " 1.312" 0.108" 24
25 0.000" 0.000" 0.000" 0.000" 2.815" 16.47 " 15.69 " 29.71 " 30.75 " 14.23 " 1.213" 0.089" 25
26 0.000" 0.000" 0.000" 0.000" 2.650" 14.38 " 14.57 " 27.36 " 26.55 " 12.97 " 0.856" 0.068" 26
27 0.000" 0.000" 0.000" 0.000" 2.227" 13.32 " 14.30 " 26.58 " 24.23 " 12.51 " 0.582" 0.050" 27
28 0.000" 0.000" 0.000" 0.000" 2.077" 13.38 " 18.52 " 24.45 " 51.94 " 11.67 " 0.383" 0.036" 28
29 0.000" 0.000" 0.000" 7.304" 15.05 " 17.56 " 40.35 " 122.9 " 10.77 " 0.273" 0.016" 29
30 0.000" 0.000" 0.000" 11.33 " 22.79 " 17.87 " 48.37 " 113.5 " 9.611" 0.275" 0.011" 30
31 0.000" 0.000" 7.141" 17.94 " 37.25 " 8.298" 0.008" 31
Mean 0.001" 0.000" 0.000" 0.000" 1.439" 12.59 " 24.92 " 40.30 " 38.12 " 25.62 " 3.502" 6.343"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 13.14 " 19.86 " 37.23 " 31.35 " 20.96 " 2.477" 0.249"
Maximum 0.015" 0.000" 0.000" 0.000" 11.33 " 26.57 " 59.34 " 102.6 " 122.9 " 85.36 " 10.99 " 54.83 "
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 3.047" 14.30 " 14.56 " 18.69 " 8.298" 0.273" 0.008"
Total 0.028" 0.000" 0.000" 0.000" 44.61 " 377.6 " 772.4 "1249 "1144 " 794.1 " 105.1 " 196.6 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 12.83 " " ... Relative Uncertainty +/-10%
Ann. Median 2.403"
Annual Total 4684 "
Maximum Minimum
Daily 122.9 " 0.000"
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2002
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.003" 0.000" 0.000" 0.000" 1.109" 6.943" 30.38 " 62.51 " 101.6 " 24.01 " 43.70 " 1.086" 1
2 0.000" 0.000" 0.000" 0.000" 0.975" 24.67 " 28.16 " 53.97 " 124.5 " 22.92 " 31.36 " 0.981" 2
3 0.000" 0.000" 0.000" 0.000" 2.157" 20.14 " 26.46 " 54.65 " 98.52 " 21.66 " 23.94 " 0.839" 3
4 0.000" 0.000" 0.000" 0.000" 2.463" 23.65 " 32.64 " 93.95 " 80.80 " 20.82 " 19.74 " 0.731" 4
5 0.000" 0.000" 0.000" 0.000" 2.188" 23.23 " 34.07 " 97.96 " 74.64 " 27.89 " 16.40 " 0.670" 5
6 0.000" 0.000" 0.000" 0.000" 6.208" 27.29 " 34.26 " 80.56 " 64.90 " 47.34 " 14.23 " 0.599" 6
7 0.000" 0.000" 0.000" 0.000" 8.502" 20.51 " 68.39 " 70.57 " 57.94 " 36.40 " 12.80 " 0.376" 7
8 0.000" 0.000" 0.000" 0.000" 14.45 " 17.68 " 48.21 " 67.06 " 52.95 " 30.08 " 11.78 " 0.280" 8
9 0.000" 0.000" 0.000" 0.000" 11.95 " 16.26 " 43.91 " 111.6 " 48.77 " 25.01 " 10.45 " 0.178" 9
10 0.000" 0.000" 0.000" 0.000" 14.36 " 15.45 " 50.01 " 224.8 $ 45.23 " 22.43 " 9.739" 0.121" 10
11 0.000" 0.000" 0.000" 0.000" 35.48 " 16.07 " 54.48 " 148.4 " 41.84 " 20.81 " 9.071" 0.069" 11
12 0.000" 0.000" 0.000" 0.000" 31.27 " 15.29 " 66.26 " 101.5 " 38.61 " 19.30 " 7.916" 0.039" 12
13 0.000" 0.000" 0.000" 0.000" 23.97 " 43.20 " 64.79 " 85.20 " 37.51 " 18.30 " 6.691" 0.026" 13
14 0.000" 0.000" 0.000" 0.000" 22.65 " 34.91 " 63.63 " 108.3 $ 59.06 " 17.66 " 5.650" 0.022" 14
15 0.000" 0.000" 0.000" 0.000" 20.56 " 29.40 " 59.76 " 417.8 $ 88.66 " 16.48 " 5.349" 0.019" 15
16 0.000" 0.000" 0.000" 0.000" 16.00 " 24.03 " 48.88 " 169.5 " 60.21 " 16.46 " 4.625" 0.014" 16
17 0.000" 0.000" 0.000" 0.000" 13.65 " 21.84 " 43.26 " 116.4 " 49.99 " 30.11 " 4.400" 0.010" 17
18 0.000" 0.000" 0.000" 0.000" 12.16 " 24.29 " 104.6 " 93.00 " 44.97 " 42.11 " 4.046" 0.006" 18
19 0.000" 0.000" 0.000" 0.000" 10.86 " 23.61 " 88.59 " 79.09 " 42.13 " 29.37 " 3.583" 0.002" 19
20 0.000" 0.000" 0.000" 0.000" 10.21 " 19.97 " 63.52 " 69.45 " 47.31 " 23.80 " 3.182" 0.001" 20
21 0.000" 0.000" 0.000" 0.000" 10.63 " 19.73 " 108.9 " 66.24 " 42.32 " 20.41 " 2.779" 0.000" 21
22 0.000" 0.000" 0.000" 0.000" 9.744" 17.59 " 112.3 " 58.58 " 40.42 " 18.63 " 2.624" 0.000" 22
23 0.000" 0.000" 0.000" 0.917" 9.374" 16.27 " 85.08 " 52.64 " 38.44 " 16.74 " 2.863" 0.000" 23
24 0.000" 0.000" 0.000" 1.630" 11.24 " 16.79 " 87.79 " 50.81 " 35.27 " 15.69 " 2.829" 0.000" 24
25 0.000" 0.000" 0.000" 1.310" 9.323" 16.46 " 86.19 " 61.01 " 32.80 " 14.64 " 2.614" 0.000" 25
26 0.000" 0.000" 0.000" 1.736" 8.381" 21.55 " 77.78 " 84.54 " 37.21 " 13.30 " 2.299" 0.000" 26
27 0.000" 0.000" 0.000" 1.317" 7.689" 17.75 " 84.36 " 90.20 " 34.52 " 14.48 " 2.036" 0.000" 27
28 0.000" 0.000" 0.000" 0.997" 7.034" 15.72 " 66.71 " 66.23 " 30.30 " 26.70 " 1.705" 0.000" 28
29 0.000" 0.000" 0.793" 6.347" 25.64 " 58.61 " 64.10 " 27.37 " 22.66 " 1.299" 0.000" 29
30 0.000" 0.000" 1.017" 6.201" 22.51 " 77.75 " 67.28 " 25.03 " 18.61 " 0.859" 0.000" 30
31 0.000" 0.000" 6.072" 64.88 " 84.95 " 15.87 " 0.000" 31
Mean 0.000" 0.000" 0.000" 0.324" 11.39 " 21.28 " 63.38 " 98.48 $ 53.46 " 22.93 " 9.019" 0.196"
Median 0.000" 0.000" 0.000" 0.000" 9.744" 20.32 " 63.63 " 80.56 $ 45.10 " 20.82 " 4.987" 0.014"
Maximum 0.003" 0.000" 0.000" 1.736" 35.48 " 43.20 " 112.3 " 417.8 $ 124.5 " 47.34 " 43.70 " 1.086"
Minimum 0.000" 0.000" 0.000" 0.000" 0.975" 6.943" 26.46 " 50.81 $ 25.03 " 13.30 " 0.859" 0.000"
Total 0.003" 0.000" 0.000" 9.717" 353.2 " 638.4 "1965 "3053 $1604 " 710.7 " 270.6 " 6.069"
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 23.59 $ " ... Relative Uncertainty +/-10%
Ann. Median 8.381$ $ ... Relative Uncertainty +/-20%
Annual Total 8610 $
Maximum Minimum
Daily 417.8 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2003
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 4.376" 287.4 $ 86.63 " 48.15 " 69.94 " 19.99 " 3.505" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 5.227" 168.1 " 76.00 " 45.25 " 58.81 " 18.44 " 3.059" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 5.234" 167.5 " 128.2 " 43.82 " 52.65 " 17.17 " 2.603" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 4.786" 153.7 " 110.0 " 61.30 " 47.85 " 16.23 " 2.241" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 4.430" 191.6 " 96.65 " 55.50 " 43.70 " 14.72 " 2.012" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 4.616" 167.1 " 88.59 " 49.79 " 40.93 " 13.37 " 1.869" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 4.182" 141.1 " 74.83 " 54.16 " 38.50 " 12.25 " 1.589" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 3.810" 108.1 " 65.68 " 66.77 " 36.67 " 11.33 " 1.444" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 3.495" 117.3 " 59.38 " 82.80 " 34.39 " 10.41 " 1.184" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 4.417" 141.2 " 88.83 " 97.62 " 31.40 " 9.396" 1.052" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 6.127" 143.0 " 167.2 " 101.0 " 29.80 " 8.510" 0.983" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 7.163" 105.8 " 93.03 " 96.62 " 37.61 " 6.673" 0.899" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 5.276" 134.1 " 79.01 " 86.17 " 71.68 " 5.926" 0.783" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 4.554" 159.4 " 72.00 " 71.73 " 52.30 " 5.582" 0.677" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 5.841" 112.5 " 70.71 " 61.83 " 43.24 " 5.585" 0.624" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 7.896" 102.3 " 114.8 " 55.80 " 38.18 " 5.343" 0.481" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 7.404" 86.88 " 82.05 " 51.59 " 36.83 " 5.538" 0.350" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 6.884" 75.76 " 69.83 " 47.18 " 34.60 " 14.36 " 0.424" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 6.699" 69.18 " 64.14 " 52.38 " 32.67 " 14.81 " 0.693" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 6.715" 91.28 " 79.11 " 97.22 " 31.76 " 12.89 " 0.695" 20
21 0.000" 0.000" 0.000" 0.000" 4.834" 6.633" 86.21 " 121.0 $ 173.3 $ 32.23 " 9.861" 0.519" 21
22 0.000" 0.000" 0.000" 0.000" 4.352" 16.84 " 84.71 " 221.4 $ 176.1 " 29.64 " 7.703" 0.368" 22
23 0.000" 0.000" 0.000" 0.000" 3.072" 25.08 " 70.44 " 115.8 " 154.6 " 27.99 " 6.160" 0.284" 23
24 0.000" 0.000" 0.000" 0.000" 2.366" 20.64 " 66.83 " 97.31 " 119.1 " 26.79 " 5.982" 0.231" 24
25 0.000" 0.000" 0.000" 0.000" 1.932" 78.89 " 71.46 " 84.46 " 104.4 " 24.65 " 7.457" 0.166" 25
26 0.000" 0.000" 0.000" 0.000" 1.696" 67.93 " 85.71 " 72.38 " 85.91 " 22.85 " 7.004" 0.111" 26
27 0.000" 0.000" 0.000" 0.000" 1.512" 80.94 " 73.20 " 65.58 " 73.82 " 32.23 " 5.659" 0.073" 27
28 0.000" 0.000" 0.000" 0.000" 1.342" 88.30 " 62.47 " 62.48 " 65.27 " 29.51 " 4.765" 0.047" 28
29 0.000" 0.000" 0.000" 1.316" 109.1 " 60.15 " 69.11 " 62.25 " 24.98 " 4.041" 0.027" 29
30 0.000" 0.000" 0.000" 2.349"1007 $ 185.0 $ 57.41 " 81.34 " 23.23 " 3.628" 0.016" 30
31 0.000" 0.000" 3.076" 112.9 " 51.73 " 21.60 " 0.008" 31
Mean 0.000" 0.000" 0.000" 0.000" 0.898" 53.68 $ 118.8 $ 89.85 $ 80.76 $ 37.39 " 9.692" 0.936"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 6.666$ 108.1 $ 79.11 $ 69.25 $ 34.39 " 8.106" 0.677"
Maximum 0.000" 0.000" 0.000" 0.000" 4.834"1007 $ 287.4 $ 221.4 $ 176.1 $ 71.68 " 19.99 " 3.505"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 3.495$ 60.15 $ 51.73 $ 43.82 $ 21.60 " 3.628" 0.008"
Total 0.000" 0.000" 0.000" 0.000" 27.85 "1611 $3682 $2785 $2423 $1159 " 290.8 " 29.02 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 32.90 $ " ... Relative Uncertainty +/-10%
Ann. Median 3.810$ $ ... Relative Uncertainty +/-20%
Annual Total 12008 $
Maximum Minimum
Daily 1007 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2004
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.004" 0.000" 0.000" 0.000" 0.000" 9.588" 58.26 " 110.8 " 82.93 " 32.50 " 8.557" 1.516" 1
2 0.001" 0.000" 0.000" 0.000" 0.000" 7.294" 125.2 " 97.25 " 75.00 " 28.86 " 8.132" 1.701" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 6.461" 94.93 " 92.02 " 67.08 " 27.75 " 15.12 " 0.990" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 12.62 " 76.19 " 88.65 " 63.53 " 27.18 " 14.08 " 1.113" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 32.22 " 68.63 " 159.9 " 70.43 " 25.62 " 10.83 " 1.364" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 34.16 " 85.72 " 137.7 " 72.48 " 30.04 " 9.155" 0.977" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 27.23 " 110.6 " 98.82 " 67.96 " 29.43 " 7.917" 0.993" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 28.20 " 137.5 " 83.41 " 62.38 " 25.00 " 6.994" 0.489" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 28.11 " 106.5 " 72.22 " 64.27 " 25.81 " 8.783" 0.303" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 55.02 " 82.85 " 64.24 " 56.85 " 25.78 " 10.61 " 0.240" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 84.95 " 70.89 " 106.2 " 51.50 " 25.23 " 11.82 " 0.195" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 81.98 " 68.83 " 154.9 " 47.60 " 35.45 " 11.58 " 0.165" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 57.55 " 60.54 " 106.3 " 44.55 " 28.84 " 8.865" 0.091" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 44.30 " 54.35 " 153.8 " 42.54 " 24.99 " 7.576" 0.058" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 37.93 " 50.65 " 106.9 " 41.03 " 22.78 " 6.276" 0.039" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 146.6 $ 52.70 " 96.76 " 38.42 " 28.69 " 5.712" 0.036" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 141.5 $ 46.73 " 109.4 " 35.80 " 24.26 " 10.00 " 0.052" 17
18 0.000" 0.000" 0.000" 0.000" 4.292" 72.58 " 42.40 " 102.9 " 35.55 " 20.98 " 7.972" 0.054" 18
19 0.000" 0.000" 0.000" 0.000" 4.480" 57.46 " 39.79 " 84.91 " 71.84 " 18.99 " 6.421" 0.033" 19
20 0.000" 0.000" 0.000" 0.000" 3.554" 48.26 " 38.15 " 85.66 " 50.20 " 17.38 " 4.627" 0.019" 20
21 0.000" 0.000" 0.000" 0.000" 28.10 " 43.82 " 114.6 " 112.3 " 50.56 " 16.59 " 3.989" 0.009" 21
22 0.000" 0.000" 0.000" 0.000" 23.50 " 80.77 " 105.3 " 96.49 " 44.41 " 15.74 " 2.797" 0.003" 22
23 0.000" 0.000" 0.000" 0.000" 12.81 " 59.03 " 72.01 " 171.6 " 39.47 " 14.85 " 1.936" 0.001" 23
24 0.000" 0.000" 0.000" 0.000" 9.448" 58.55 " 62.47 " 229.6 $ 36.79 " 13.90 " 1.571" 0.000" 24
25 0.000" 0.000" 0.000" 0.000" 7.672" 49.77 " 62.53 " 234.0 " 35.56 " 12.45 " 2.406" 0.000" 25
26 0.000" 0.000" 0.000" 0.000" 6.800" 45.11 " 53.99 " 206.4 " 36.42 " 10.27 " 3.699" 0.000" 26
27 0.000" 0.000" 0.000" 0.000" 6.540" 98.70 " 55.55 " 206.3 " 32.81 " 9.843" 4.194" 0.000" 27
28 0.000" 0.000" 0.000" 0.000" 6.276" 84.12 " 51.14 " 184.8 " 31.58 " 9.448" 3.752" 0.000" 28
29 0.000" 0.000" 0.000" 0.000" 5.840" 65.70 " 89.03 " 132.8 " 29.46 " 8.991" 2.845" 0.000" 29
30 0.000" 0.000" 0.000" 5.880" 57.10 " 186.1 " 105.9 " 30.15 " 8.315" 2.446" 0.000" 30
31 0.000" 0.000" 13.09 " 117.1 " 92.85 " 8.406" 0.000" 31
Mean 0.000" 0.000" 0.000" 0.000" 4.461" 55.22 $ 78.75 " 125.4 $ 50.30 " 21.11 " 7.022" 0.337"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 52.39 $ 68.83 " 106.3 $ 46.07 " 24.26 " 7.285" 0.052"
Maximum 0.004" 0.000" 0.000" 0.000" 28.10 " 146.6 $ 186.1 " 234.0 $ 82.93 " 35.45 " 15.12 " 1.701"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 6.461$ 38.15 " 64.24 $ 29.46 " 8.315" 1.571" 0.000"
Total 0.004" 0.000" 0.000" 0.000" 138.3 "1657 $2441 "3886 $1509 " 654.4 " 210.7 " 10.44 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 28.71 $ " ... Relative Uncertainty +/-10%
Ann. Median 5.169$ $ ... Relative Uncertainty +/-20%
Annual Total 10507 $
Maximum Minimum
Daily 234.0 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2005
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 1.467" 15.80 " 76.01 " 51.81 " 48.41 " 68.26 " 48.55 " 8.568" 1
2 0.000" 0.000" 0.000" 0.000" 1.665" 14.86 " 65.30 " 113.3 " 56.72 " 58.76 " 43.58 " 6.878" 2
3 0.000" 0.000" 0.000" 0.000" 1.974" 21.29 " 71.12 " 88.22 " 53.75 " 51.13 " 38.70 " 7.035" 3
4 0.000" 0.000" 0.000" 0.000" 1.854" 28.93 " 84.25 " 71.67 " 50.17 " 74.95 " 38.72 " 6.085" 4
5 0.000" 0.000" 0.000" 0.000" 1.393" 21.08 " 76.27 " 65.42 " 73.03 " 74.65 " 47.45 " 5.529" 5
6 0.000" 0.000" 0.000" 0.000" 1.039" 22.82 " 65.41 " 61.87 " 223.5 $ 150.6 " 39.85 " 6.784" 6
7 0.000" 0.000" 0.000" 0.000" 0.950" 53.96 " 59.23 " 60.12 " 120.8 " 100.7 " 36.14 " 6.524" 7
8 0.000" 0.000" 0.000" 0.000" 0.916" 44.89 " 55.19 " 54.62 " 99.73 " 80.97 " 38.07 " 7.538" 8
9 0.000" 0.000" 0.000" 0.000" 0.873" 58.06 " 51.62 " 52.04 " 98.98 " 73.73 " 35.06 " 7.322" 9
10 0.000" 0.000" 0.000" 0.000" 0.817" 98.73 " 47.97 " 56.77 " 81.93 " 65.22 " 31.20 " 6.925" 10
11 0.000" 0.000" 0.000" 0.000" 4.956" 95.98 " 45.23 " 53.21 " 74.60 " 59.21 " 29.43 " 8.815" 11
12 0.000" 0.000" 0.000" 0.000" 16.07 " 147.3 " 43.66 " 66.13 " 91.89 " 60.79 " 26.52 " 8.036" 12
13 0.000" 0.000" 0.000" 0.000" 7.320" 117.5 " 93.28 " 102.4 " 81.47 " 54.15 " 24.06 " 8.195" 13
14 0.000" 0.000" 0.000" 0.000" 5.014" 138.1 " 126.8 " 99.98 " 89.27 " 49.31 " 22.20 " 6.931" 14
15 0.000" 0.000" 0.000" 0.000" 5.439" 107.5 " 98.62 " 78.09 " 69.04 " 45.65 " 20.20 " 5.898" 15
16 0.000" 0.000" 0.000" 0.000" 88.30 " 97.21 " 87.03 " 168.5 $ 62.17 " 43.09 " 18.49 " 4.970" 16
17 0.000" 0.000" 0.000" 0.000" 44.57 " 104.5 " 71.80 " 256.4 $ 85.04 " 54.43 " 17.24 " 5.390" 17
18 0.000" 0.000" 0.000" 0.000" 68.62 " 97.43 " 69.26 " 276.5 $ 70.92 " 51.10 " 15.06 " 4.611" 18
19 0.000" 0.000" 0.000" 0.000" 122.2 " 111.7 " 66.78 " 153.2 " 61.90 " 44.38 " 14.89 " 3.765" 19
20 0.000" 0.000" 0.000" 0.000" 72.73 " 90.64 " 76.87 " 118.9 " 63.91 " 40.19 " 13.80 " 3.283" 20
21 0.000" 0.000" 0.000" 0.000" 54.94 " 77.38 " 183.8 " 102.9 " 66.89 " 53.16 " 11.70 " 2.376" 21
22 0.000" 0.000" 0.000" 0.000" 45.26 " 67.33 " 99.68 " 87.79 " 59.73 " 56.65 " 11.62 " 2.987" 22
23 0.000" 0.000" 0.000" 0.000" 38.92 " 169.3 $ 90.01 " 77.33 " 55.24 " 44.69 " 10.17 " 2.823" 23
24 0.000" 0.000" 0.000" 2.013" 33.04 " 172.9 " 80.55 " 70.97 " 49.25 " 45.85 " 10.21 " 3.213" 24
25 0.000" 0.000" 0.000" 2.710" 29.11 " 107.3 " 75.34 " 64.29 " 45.60 " 57.85 " 8.300" 2.611" 25
26 0.000" 0.000" 0.000" 2.202" 26.31 " 85.99 " 67.50 " 59.69 " 45.04 " 49.71 " 6.729" 1.770" 26
27 0.000" 0.000" 0.000" 2.190" 24.07 " 74.35 " 61.28 " 57.85 " 53.86 " 43.65 " 9.581" 2.370" 27
28 0.000" 0.000" 0.000" 2.176" 22.27 " 65.32 " 57.16 " 63.00 " 50.54 " 41.17 " 10.34 " 1.412" 28
29 0.000" 0.000" 2.056" 20.47 " 89.71 " 52.74 " 59.64 " 55.76 " 37.15 " 11.00 " 1.738" 29
30 0.000" 0.000" 2.054" 18.64 " 106.0 " 49.55 " 56.88 " 55.90 " 52.50 " 9.995" 1.177" 30
31 0.000" 0.000" 17.18 " 47.13 " 51.82 " 57.60 " 1.374" 31
Mean 0.000" 0.000" 0.000" 0.513" 25.11 " 83.46 $ 74.08 " 90.37 $ 73.17 $ 59.39 " 23.29 " 4.933"
Median 0.000" 0.000" 0.000" 0.000" 17.18 " 90.17 $ 69.26 " 66.13 $ 63.04 $ 54.15 " 19.35 " 5.390"
Maximum 0.000" 0.000" 0.000" 2.710" 122.2 " 172.9 $ 183.8 " 276.5 $ 223.5 $ 150.6 " 48.55 " 8.815"
Minimum 0.000" 0.000" 0.000" 0.000" 0.817" 14.86 $ 43.66 " 51.81 $ 45.04 $ 37.15 " 6.729" 1.177"
Total 0.000" 0.000" 0.000" 15.40 " 778.4 "2504 $2296 "2801 $2195 $1841 " 698.8 " 152.9 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 36.39 $ " ... Relative Uncertainty +/-10%
Ann. Median 17.24 $ $ ... Relative Uncertainty +/-20%
Annual Total 13283 $
Maximum Minimum
Daily 276.5 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2006
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.499" 0.000" 0.000" 0.000" 0.000" 0.000" 6.451" 62.48 " 80.13 " 23.35 " 6.087" 7.434" 1
2 0.324" 0.000" 0.000" 0.000" 0.000" 0.000" 5.641" 53.97 " 66.35 " 22.06 " 5.532" 5.144" 2
3 0.377" 0.000" 0.000" 0.000" 0.000" 0.000" 8.196" 43.11 " 58.48 " 32.14 " 6.185" 3.814" 3
4 0.702" 0.000" 0.000" 0.000" 0.000" 0.000" 9.989" 38.85 " 62.20 " 42.66 " 4.761" 2.979" 4
5 1.221" 0.000" 0.000" 0.000" 0.000" 0.000" 7.320" 35.09 " 62.95 " 30.23 " 4.568" 2.352" 5
6 0.591" 0.000" 0.000" 0.000" 0.000" 0.000" 5.784" 44.21 " 53.93 " 25.17 " 4.122" 1.198" 6
7 0.426" 0.000" 0.000" 0.000" 0.000" 0.048" 4.922" 107.6 " 47.64 " 21.83 " 5.563" 1.307" 7
8 0.284" 0.000" 0.000" 0.000" 0.000" 0.427" 4.620" 90.92 " 43.51 " 19.34 " 6.774" 1.550" 8
9 0.169" 0.000" 0.000" 0.000" 0.000" 0.458" 5.148" 68.25 " 40.88 " 17.76 " 6.703" 1.264" 9
10 0.117" 0.000" 0.000" 0.000" 0.000" 0.484" 9.492" 58.00 " 39.10 " 16.60 " 8.769" 1.131" 10
11 0.083" 0.000" 0.000" 0.000" 0.000" 0.538" 17.86 " 51.79 " 64.82 " 33.65 " 8.377" 0.839" 11
12 0.057" 0.000" 0.000" 0.000" 0.000" 0.671" 12.08 " 93.91 " 83.43 " 36.76 " 8.525" 0.639" 12
13 0.040" 0.000" 0.000" 0.000" 0.000" 8.214" 9.492" 68.04 " 60.21 " 26.81 " 5.917" 0.464" 13
14 0.032" 0.000" 0.000" 0.000" 0.000" 7.932" 12.67 " 56.80 " 50.06 " 22.21 " 4.693" 0.394" 14
15 0.024" 0.000" 0.000" 0.000" 0.000" 4.284" 13.11 " 65.70 " 44.70 " 19.92 " 2.968" 0.308" 15
16 0.012" 0.000" 0.000" 0.000" 0.000" 3.117" 10.98 " 65.41 " 40.73 " 18.12 " 2.740" 0.217" 16
17 0.005" 0.000" 0.000" 0.000" 0.000" 2.644" 9.387" 54.59 " 40.28 " 16.32 " 3.149" 0.205" 17
18 0.002" 0.000" 0.000" 0.000" 0.000" 2.399" 8.456" 61.42 " 61.04 " 16.78 " 3.311" 0.172" 18
19 0.001" 0.000" 0.000" 0.000" 0.000" 4.374" 7.730" 85.02 " 51.04 " 15.51 " 2.878" 0.135" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 8.079" 19.95 " 122.1 " 45.42 " 13.95 " 2.544" 0.129" 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 5.090" 45.23 " 84.09 " 45.62 " 24.49 " 2.031" 0.157" 21
22 0.000" 0.000" 0.000" 0.000" 0.000" 4.045" 24.74 " 309.2 $ 42.02 " 22.10 " 2.266" 0.123" 22
23 0.000" 0.000" 0.000" 0.000" 0.000" 3.460" 19.45 " 183.9 " 37.47 " 17.94 " 1.540" 0.071" 23
24 0.000" 0.000" 0.000" 0.000" 0.000" 2.978" 55.55 " 119.7 " 33.91 " 14.65 " 1.776" 0.040" 24
25 0.005" 0.000" 0.000" 0.000" 0.000" 2.705" 60.27 " 101.4 " 33.11 " 12.74 " 1.222" 0.019" 25
26 0.057" 0.000" 0.000" 0.000" 0.000" 2.671" 46.88 " 84.74 " 32.93 " 11.16 " 1.329" 0.008" 26
27 0.047" 0.000" 0.000" 0.000" 0.000" 5.957" 61.18 " 73.22 " 29.99 " 10.04 " 0.816" 0.002" 27
28 0.024" 0.000" 0.000" 0.000" 0.000" 11.57 " 58.83 " 65.88 " 27.74 " 8.546" 1.227" 0.000" 28
29 0.010" 0.000" 0.000" 0.000" 6.601" 51.75 " 58.53 " 25.96 " 8.097" 19.08 " 0.000" 29
30 0.003" 0.000" 0.000" 0.000" 5.042" 52.62 " 53.82 " 25.24 " 6.631" 15.81 " 0.000" 30
31 0.000" 0.000" 0.000" 60.90 " 113.9 " 6.047" 0.000" 31
Mean 0.165" 0.000" 0.000" 0.000" 0.000" 3.126" 23.44 " 83.09 $ 47.70 " 19.79 " 5.042" 1.035"
Median 0.032" 0.000" 0.000" 0.000" 0.000" 2.688" 12.08 " 65.88 $ 45.06 " 18.12 " 4.345" 0.217"
Maximum 1.221" 0.000" 0.000" 0.000" 0.000" 11.57 " 61.18 " 309.2 $ 83.43 " 42.66 " 19.08 " 7.434"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 4.620" 35.09 $ 25.24 " 6.047" 0.816" 0.000"
Total 5.115" 0.000" 0.000" 0.000" 0.000" 93.79 " 726.7 "2576 $1431 " 613.6 " 151.3 " 32.09 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 15.42 $ " ... Relative Uncertainty +/-10%
Ann. Median 0.816$ $ ... Relative Uncertainty +/-20%
Annual Total 5629 $
Maximum Minimum
Daily 309.2 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2007
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 6.018" 2.043" 24.38 " 202.5 " 95.39 " 59.83 " 19.02 " 2.818" 1
2 0.000" 0.000" 0.000" 0.000" 4.325" 1.945" 40.28 " 146.1 " 86.69 " 53.65 " 16.28 " 2.926" 2
3 0.035" 0.000" 0.000" 0.000" 2.871" 1.694" 43.09 " 102.6 " 71.17 " 48.04 " 14.18 " 2.783" 3
4 0.079" 0.000" 0.000" 0.000" 2.609" 1.583" 31.68 " 84.51 " 73.79 " 44.21 " 13.23 " 2.328" 4
5 0.070" 0.000" 0.000" 0.000" 3.216" 1.510" 27.51 " 74.97 " 81.48 " 39.87 " 11.70 " 2.215" 5
6 0.049" 0.000" 0.000" 0.000" 2.800" 1.474" 27.12 " 144.4 " 68.90 " 37.49 " 10.10 " 4.131" 6
7 0.025" 0.000" 0.000" 0.000" 2.049" 1.559" 23.09 " 124.8 " 86.39 " 35.26 " 9.764" 3.236" 7
8 0.011" 0.000" 0.000" 0.000" 2.391" 2.083" 25.23 " 87.41 " 150.8 " 39.38 " 9.070" 2.517" 8
9 0.004" 0.000" 0.000" 0.000" 2.515" 2.018" 24.18 " 73.23 " 122.0 " 45.80 " 9.098" 1.912" 9
10 0.004" 0.000" 0.000" 0.000" 2.131" 1.838" 19.80 " 142.8 " 86.91 " 52.80 " 8.126" 1.406" 10
11 0.006" 0.000" 0.000" 0.000" 1.989" 1.636" 17.17 " 141.6 " 88.88 " 46.09 " 7.264" 1.161" 11
12 0.003" 0.000" 0.000" 0.000" 1.859" 1.555" 15.82 " 101.7 " 143.4 " 37.22 " 6.738" 1.017" 12
13 0.001" 0.000" 0.000" 0.000" 1.873" 4.081" 15.09 " 81.95 " 140.3 " 32.09 " 5.388" 0.955" 13
14 0.000" 0.000" 0.000" 0.000" 1.757" 11.39 " 14.50 " 78.34 " 158.0 " 29.61 " 5.192" 0.879" 14
15 0.000" 0.000" 0.000" 0.000" 1.632" 5.594" 13.37 " 68.13 " 174.9 " 27.68 " 4.233" 0.722" 15
16 0.000" 0.000" 0.000" 0.000" 1.534" 4.021" 13.02 " 60.57 " 130.6 " 25.48 " 3.799" 0.791" 16
17 0.000" 0.000" 0.000" 0.000" 1.617" 3.360" 12.41 " 54.11 " 126.9 " 32.28 " 3.137" 1.510" 17
18 0.000" 0.000" 0.000" 0.000" 1.905" 2.848" 12.02 " 49.31 " 122.9 " 38.61 " 3.485" 2.112" 18
19 0.000" 0.000" 0.000" 0.000" 1.821" 2.596" 25.31 " 103.9 $ 97.41 " 29.65 " 2.963" 1.936" 19
20 0.000" 0.000" 0.000" 0.000" 1.735" 2.470" 53.78 " 225.7 $ 85.32 " 28.63 " 2.547" 1.485" 20
21 0.000" 0.000" 0.000" 0.000" 1.574" 2.358" 37.46 " 106.0 " 81.77 " 36.37 " 2.471" 1.198" 21
22 0.000" 0.000" 0.000" 0.000" 1.502" 4.046" 48.93 " 88.31 " 105.6 " 29.50 " 2.167" 1.005" 22
23 0.000" 0.000" 0.000" 0.000" 1.476" 12.97 " 56.23 " 103.3 " 81.59 " 24.24 " 2.012" 0.825" 23
24 0.000" 0.000" 0.000" 0.000" 1.420" 15.70 " 145.2 " 79.21 " 144.4 " 21.60 " 1.855" 0.599" 24
25 0.000" 0.000" 0.000" 0.000" 1.507" 13.85 " 93.97 " 84.41 " 141.4 " 19.42 " 1.693" 0.268" 25
26 0.000" 0.000" 0.000" 0.000" 1.752" 10.36 " 72.93 " 96.45 " 123.6 " 21.84 " 1.586" 0.169" 26
27 0.000" 0.000" 0.000" 0.000" 2.285" 10.32 " 128.2 " 90.27 " 99.73 " 35.53 " 1.313" 0.110" 27
28 0.000" 0.000" 0.000" 0.000" 4.698" 26.79 " 152.6 " 75.82 " 88.99 " 33.69 " 1.173" 0.092" 28
29 0.000" 0.000" 2.430" 3.610" 18.22 " 107.1 " 105.8 " 75.87 " 28.31 " 1.077" 0.059" 29
30 0.000" 0.000" 4.774" 2.696" 18.40 " 196.9 $ 131.8 " 67.26 " 24.12 " 1.682" 0.041" 30
31 0.000" 0.000" 2.214" 202.8 " 89.23 " 20.86 " 0.025" 31
Mean 0.009" 0.000" 0.000" 0.240" 2.367" 6.344" 55.52 $ 103.2 $ 106.7 " 34.81 " 6.078" 1.395"
Median 0.000" 0.000" 0.000" 0.000" 1.989" 2.722" 27.51 $ 90.27 $ 96.40 " 33.69 " 4.016" 1.161"
Maximum 0.079" 0.000" 0.000" 4.774" 6.018" 26.79 " 202.8 $ 225.7 $ 174.9 " 59.83 " 19.02 " 4.131"
Minimum 0.000" 0.000" 0.000" 0.000" 1.420" 1.474" 12.02 $ 49.31 $ 67.26 " 19.42 " 1.077" 0.025"
Total 0.286" 0.000" 0.000" 7.204" 73.38 " 190.3 "1721 $3199 $3202 "1079 " 182.3 " 43.23 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 26.57 $ " ... Relative Uncertainty +/-10%
Ann. Median 2.285$ $ ... Relative Uncertainty +/-20%
Annual Total 9699 $
Maximum Minimum
Daily 225.7 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2008
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.010" 0.000" 0.000" 0.000" 2.210" 63.75 " 80.27 " 254.0 $ 34.73 " 29.94 " 17.04 " 12.33 " 1
2 0.006" 0.000" 0.000" 0.000" 2.034" 49.88 " 68.51 " 487.6 $ 33.21 " 36.83 " 14.69 " 10.82 " 2
3 0.007" 0.000" 0.000" 0.000" 2.734" 43.25 " 60.68 " 256.4 $ 29.62 " 31.32 " 14.12 " 9.773" 3
4 0.005" 0.000" 0.000" 0.000" 3.090" 38.25 " 78.21 " 172.2 " 27.20 " 41.27 " 25.26 " 8.781" 4
5 0.002" 0.000" 0.000" 0.000" 2.585" 34.47 " 90.94 " 137.9 " 25.78 " 38.93 " 26.76 " 8.208" 5
6 0.000" 0.000" 0.000" 0.000" 2.255" 31.86 " 75.18 " 115.9 " 25.47 " 31.21 " 42.46 " 7.631" 6
7 0.000" 0.000" 0.000" 0.000" 2.005" 32.02 " 63.52 " 108.4 " 24.02 " 27.73 " 35.02 " 6.824" 7
8 0.000" 0.000" 0.000" 0.000" 1.895" 28.73 " 56.98 " 93.83 " 22.92 " 24.62 " 27.94 " 6.058" 8
9 0.000" 0.000" 0.000" 0.000" 1.864" 92.00 " 71.27 " 82.88 " 21.95 " 22.16 " 24.25 " 5.728" 9
10 0.000" 0.000" 0.000" 0.000" 13.05 " 101.2 " 95.56 " 74.57 " 24.15 " 20.41 " 20.89 " 5.360" 10
11 0.000" 0.000" 0.000" 0.000" 20.31 " 75.45 " 145.8 " 67.76 " 31.93 " 19.00 " 18.88 " 5.064" 11
12 0.000" 0.000" 0.000" 0.000" 11.17 " 66.80 " 165.5 " 62.08 " 28.81 " 18.92 " 19.04 " 4.521" 12
13 0.000" 0.000" 0.000" 0.000" 10.11 " 56.86 " 159.0 " 58.13 " 27.67 " 19.52 " 18.48 " 4.048" 13
14 0.000" 0.000" 0.000" 0.000" 9.620" 50.09 " 114.1 " 54.84 " 26.51 " 18.54 " 15.41 " 3.591" 14
15 0.000" 0.000" 0.000" 0.000" 12.30 " 128.7 " 270.2 $ 51.38 " 24.73 " 16.51 " 13.31 " 3.118" 15
16 0.000" 0.000" 0.000" 0.000" 12.05 " 219.8 " 246.2 $ 48.29 " 21.86 " 15.23 " 11.77 " 2.995" 16
17 0.000" 0.000" 0.000" 0.000" 9.535" 201.2 " 171.9 " 45.47 " 42.84 " 14.76 " 10.79 " 2.721" 17
18 0.000" 0.000" 0.000" 0.000" 9.518" 133.3 " 328.4 $ 43.44 " 44.32 " 14.24 " 10.05 " 2.418" 18
19 0.000" 0.000" 0.000" 0.000" 8.604" 97.46 " 290.2 $ 48.27 " 37.70 " 13.43 " 9.239" 2.110" 19
20 0.000" 0.000" 0.000" 0.000" 7.716" 80.71 " 166.2 " 49.47 " 33.97 " 12.42 " 11.40 " 2.478" 20
21 0.000" 0.000" 0.000" 0.000" 7.173" 68.92 " 125.4 " 42.53 " 37.67 " 14.78 " 16.24 " 3.087" 21
22 0.000" 0.000" 0.000" 0.000" 55.38 " 65.97 " 104.0 " 38.64 " 36.13 " 15.55 " 22.00 " 2.394" 22
23 0.000" 0.000" 0.000" 2.152" 69.36 " 56.48 " 233.7 $ 36.52 " 29.42 " 15.74 " 22.10 " 2.000" 23
24 0.000" 0.000" 0.000" 2.503" 95.88 " 54.59 " 249.9 $ 35.38 " 27.14 " 28.48 " 24.25 " 1.567" 24
25 0.000" 0.000" 0.000" 1.780" 93.90 " 65.43 " 197.2 " 35.47 " 46.57 " 31.86 " 21.93 " 1.334" 25
26 0.000" 0.000" 0.000" 1.576" 53.58 " 51.64 " 163.9 " 33.43 " 36.50 " 21.74 " 20.47 " 1.079" 26
27 0.000" 0.000" 0.000" 1.793" 41.80 " 56.31 " 158.0 " 31.71 " 29.46 " 17.62 " 20.98 " 1.017" 27
28 0.000" 0.000" 0.000" 1.800" 65.91 " 87.51 " 259.7 $ 30.29 " 31.45 " 15.76 " 18.29 " 0.924" 28
29 0.000" 0.000" 0.000" 2.153" 63.56 " 112.1 " 269.9 $ 32.81 " 30.10 " 27.05 " 15.31 " 0.687" 29
30 0.000" 0.000" 2.563" 48.65 " 83.80 " 450.8 $ 34.85 " 31.27 " 25.78 " 13.77 " 0.494" 30
31 0.000" 0.000" 75.88 " 331.0 $ 32.84 " 20.94 " 0.370" 31
Mean 0.001" 0.000" 0.000" 0.544" 26.31 " 77.62 " 172.3 $ 87.01 $ 30.84 " 22.65 " 19.40 " 4.178"
Median 0.000" 0.000" 0.000" 0.000" 10.11 " 65.70 " 159.0 $ 49.47 $ 29.54 " 20.41 " 18.68 " 3.087"
Maximum 0.010" 0.000" 0.000" 2.563" 95.88 " 219.8 " 450.8 $ 487.6 $ 46.57 " 41.27 " 42.46 " 12.33 "
Minimum 0.000" 0.000" 0.000" 0.000" 1.864" 28.73 " 56.98 $ 30.29 $ 21.86 " 12.42 " 9.239" 0.370"
Total 0.030" 0.000" 0.000" 16.32 " 815.7 "2329 "5342 $2697 $ 925.1 " 702.3 " 582.1 " 129.5 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 36.99 $ " ... Relative Uncertainty +/-10%
Ann. Median 14.46 $ $ ... Relative Uncertainty +/-20%
Annual Total 13539 $
Maximum Minimum
Daily 487.6 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2009
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.221" 0.000" 0.000" 0.000" 0.000" 11.91 " 142.4 " 75.49 " 95.71 " 83.76 " 14.57 " 2.940" 1
2 0.170" 0.000" 0.000" 0.000" 0.000" 8.321" 113.0 " 76.83 " 103.7 " 77.77 " 12.99 " 2.835" 2
3 0.123" 0.000" 0.000" 0.000" 0.000" 7.365" 85.85 " 72.26 " 81.64 " 85.27 " 12.02 " 2.549" 3
4 0.081" 0.000" 0.000" 0.000" 0.000" 7.067" 72.17 " 67.51 " 75.39 " 69.53 " 11.26 " 2.137" 4
5 0.055" 0.000" 0.000" 0.000" 0.000" 6.480" 62.90 " 65.71 " 124.1 " 62.20 " 10.95 " 1.852" 5
6 0.034" 0.000" 0.000" 0.000" 0.000" 5.244" 112.0 " 91.14 " 105.7 " 56.64 " 10.74 " 1.653" 6
7 0.018" 0.000" 0.000" 0.000" 0.000" 4.521" 123.5 " 74.77 " 114.1 " 52.77 " 10.47 " 1.482" 7
8 0.008" 0.000" 0.000" 0.000" 0.000" 4.184" 140.9 " 66.83 " 143.7 " 49.57 " 9.845" 1.237" 8
9 0.004" 0.000" 0.000" 0.000" 0.000" 3.929" 247.3 $ 63.42 " 110.7 " 46.99 " 8.739" 1.056" 9
10 0.001" 0.000" 0.000" 0.000" 0.000" 7.704" 214.4 $ 87.19 " 199.5 $ 45.15 " 8.191" 0.909" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 16.61 " 130.2 " 103.3 " 265.9 $ 42.91 " 7.647" 0.735" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 14.88 " 101.1 " 164.1 " 177.4 " 39.96 " 9.726" 0.575" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 11.32 " 84.98 " 145.0 " 126.0 " 38.10 " 26.10 " 0.383" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 10.35 " 73.89 " 142.6 " 122.7 " 36.38 " 17.97 " 0.277" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 16.44 " 73.04 " 268.3 $ 138.0 " 34.50 " 13.37 " 0.223" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 54.24 " 169.5 " 192.9 " 106.3 " 31.30 " 11.49 " 0.178" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 51.54 " 210.3 " 173.5 " 105.5 " 28.79 " 11.15 " 0.136" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 42.24 " 355.9 $ 204.8 $ 201.6 " 26.68 " 13.16 " 0.108" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 54.32 "1015 $ 185.7 " 137.7 " 25.02 " 16.56 " 0.087" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 89.37 " 866.7 $ 172.3 " 147.5 " 22.86 " 14.67 " 0.067" 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 96.01 " 733.9 $ 139.9 " 208.9 " 22.15 " 12.22 " 0.044" 21
22 0.000" 0.000" 0.000" 0.000" 1.967" 58.29 " 388.6 $ 139.0 " 142.4 " 20.77 " 11.41 " 0.024" 22
23 0.000" 0.000" 0.000" 0.000" 3.674" 55.85 " 544.9 $ 125.7 " 135.3 " 19.73 " 9.703" 0.011" 23
24 0.000" 0.000" 0.000" 0.000" 2.811" 243.5 $ 263.1 $ 104.7 " 108.4 " 18.73 " 7.890" 0.005" 24
25 0.000" 0.000" 0.000" 0.000" 1.965" 164.5 " 252.8 $ 93.47 " 89.44 " 16.65 " 6.183" 0.002" 25
26 0.000" 0.000" 0.000" 0.000" 1.562" 116.2 " 179.3 " 84.48 " 77.67 " 15.67 " 5.317" 0.000" 26
27 0.000" 0.000" 0.000" 0.000" 1.300" 162.0 " 148.4 " 77.49 " 70.49 " 16.07 " 4.932" 0.000" 27
28 0.000" 0.000" 0.000" 0.000" 1.086" 219.2 $ 123.1 " 86.73 " 103.9 " 20.34 " 4.543" 0.000" 28
29 0.000" 0.000" 0.000" 0.965" 316.8 $ 103.7 " 80.72 " 100.0 " 23.43 " 3.974" 0.000" 29
30 0.000" 0.000" 0.000" 0.891" 233.2 $ 91.81 " 70.12 " 97.16 " 19.50 " 3.336" 0.000" 30
31 0.000" 0.000" 6.704" 82.62 " 68.02 " 16.73 " 0.000" 31
Mean 0.023" 0.000" 0.000" 0.000" 0.740" 69.78 $ 235.7 $ 115.0 $ 127.2 $ 37.61 " 10.70 " 0.694"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 29.42 $ 140.9 $ 91.14 $ 112.4 $ 31.30 " 10.84 " 0.178"
Maximum 0.221" 0.000" 0.000" 0.000" 6.704" 316.8 $1015 $ 268.3 $ 265.9 $ 85.27 " 26.10 " 2.940"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 3.929$ 62.90 $ 63.42 $ 70.49 $ 15.67 " 3.336" 0.000"
Total 0.716" 0.000" 0.000" 0.000" 22.93 "2093 $7307 $3564 $3816 $1166 " 321.1 " 21.50 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 50.17 $ " ... Relative Uncertainty +/-10%
Ann. Median 3.929$ $ ... Relative Uncertainty +/-20%
Annual Total 18313 $
Maximum Minimum
Daily 1015 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2010
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 9.176" 24.07 " 96.57 " 41.25 " 14.63 " 3.037" 0.014" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 7.534" 24.87 " 81.61 " 38.05 " 13.46 " 2.477" 0.009" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 7.141" 23.89 " 71.31 " 36.33 " 12.48 " 1.958" 0.015" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 7.333" 21.62 " 63.98 " 36.19 " 12.56 " 1.604" 0.025" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 6.802" 19.34 " 65.38 " 34.76 " 12.89 " 1.484" 0.059" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 6.111" 17.86 " 61.99 " 35.27 " 11.92 " 1.412" 0.066" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 9.291" 17.69 " 55.94 " 50.19 " 10.96 " 1.341" 0.114" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 14.45 " 39.41 " 51.22 " 70.37 " 10.08 " 1.130" 0.117" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 10.85 " 91.86 " 47.01 " 58.77 " 9.393" 1.516" 0.067" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 8.877" 91.76 " 43.47 " 49.24 " 11.23 " 5.057" 0.033" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 7.827" 74.32 " 53.87 " 43.89 " 13.78 " 8.418" 0.019" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 7.231" 121.8 " 472.4 $ 50.81 " 11.77 " 6.030" 0.012" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 6.746" 109.9 " 291.6 $ 47.00 " 10.36 " 4.263" 0.006" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 10.41 " 82.58 " 176.2 " 41.38 " 9.495" 3.004" 0.002" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 11.06 " 70.46 " 124.8 " 37.75 " 7.694" 2.218" 0.001" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 9.898" 83.23 " 100.9 " 34.18 " 7.240" 1.697" 0.000" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 10.61 " 82.09 " 93.45 " 30.87 " 6.353" 1.349" 0.000" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 12.26 " 67.68 " 86.43 " 28.53 " 5.546" 0.980" 0.000" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 11.33 " 60.08 " 80.86 " 27.21 " 4.917" 0.489" 0.000" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 10.33 " 52.84 " 76.74 " 25.68 " 5.664" 0.316" 0.000" 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 9.076" 47.70 " 75.57 " 24.21 " 13.49 " 0.267" 0.000" 21
22 0.000" 0.000" 0.000" 0.000" 0.000" 8.858" 42.57 " 75.34 " 22.63 " 11.13 " 0.337" 0.006" 22
23 0.000" 0.000" 0.000" 0.000" 0.000" 22.40 " 38.81 " 66.99 " 21.45 " 8.522" 0.319" 0.018" 23
24 0.000" 0.000" 0.000" 0.000" 0.000" 21.68 " 35.88 " 64.43 " 20.60 " 6.710" 0.226" 0.010" 24
25 0.000" 0.000" 0.000" 0.000" 0.000" 20.02 " 45.68 " 58.62 " 20.04 " 5.473" 0.188" 0.004" 25
26 0.000" 0.000" 0.000" 0.000" 0.187" 34.86 " 131.3 " 54.35 " 19.24 " 4.769" 0.152" 0.001" 26
27 0.000" 0.000" 0.000" 0.000" 31.28 " 51.37 " 100.1 " 50.45 " 18.38 " 4.351" 0.096" 0.000" 27
28 0.000" 0.000" 0.000" 0.000" 16.86 " 37.49 " 170.5 " 47.07 " 17.34 " 4.788" 0.068" 0.000" 28
29 0.000" 0.000" 0.000" 10.46 " 32.34 " 252.9 $ 46.15 " 16.30 " 5.164" 0.041" 0.000" 29
30 0.000" 0.000" 0.000" 7.872" 28.48 " 159.2 " 48.89 " 15.57 " 4.456" 0.024" 0.000" 30
31 0.000" 0.000" 8.812" 122.8 " 44.73 " 3.696" 0.000" 31
Mean 0.000" 0.000" 0.000" 0.000" 2.434" 15.06 " 74.99 $ 91.24 $ 33.78 " 8.870" 1.717" 0.019"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 10.37 " 67.68 $ 65.38 $ 34.47 " 9.393" 1.345" 0.006"
Maximum 0.000" 0.000" 0.000" 0.000" 31.28 " 51.37 " 252.9 $ 472.4 $ 70.37 " 14.63 " 8.418" 0.117"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 6.111" 17.69 $ 43.47 $ 15.57 " 3.696" 0.024" 0.000"
Total 0.000" 0.000" 0.000" 0.000" 75.47 " 451.8 "2325 $2828 $1013 " 275.0 " 51.50 " 0.598"
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 19.24 $ " ... Relative Uncertainty +/-10%
Ann. Median 0.188$ $ ... Relative Uncertainty +/-20%
Annual Total 7021 $
Maximum Minimum
Daily 472.4 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2011
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 5.735" 49.56 " 174.8 " 62.80 " 47.18 " 11.79 " 1.674" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 9.658" 79.61 " 178.7 " 103.6 " 64.30 " 10.66 " 1.342" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 7.737" 96.85 " 166.8 " 87.64 " 69.18 " 10.88 " 1.004" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 7.281" 73.82 " 134.6 " 77.27 " 55.12 " 16.97 " 0.742" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 5.773" 56.34 " 101.6 " 77.46 " 47.62 " 18.90 " 0.583" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 4.884" 52.95 " 87.29 " 66.87 " 44.08 " 15.45 " 0.564" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 4.247" 49.91 " 95.17 " 60.15 " 40.73 " 13.36 " 0.718" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 3.842" 40.52 " 92.16 " 53.55 " 45.63 " 14.60 " 0.791" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 3.595" 35.34 " 86.95 " 49.01 " 61.57 " 14.63 " 0.722" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 3.381" 32.01 " 73.74 " 45.85 " 47.83 " 12.68 " 0.533" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 3.135" 30.63 " 65.02 " 43.28 " 40.21 " 11.66 " 0.323" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 2.824" 30.27 " 59.62 " 40.76 " 36.01 " 10.60 " 0.233" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 2.653" 27.16 " 94.56 $ 38.25 " 35.58 " 9.604" 0.223" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 5.512" 24.90 " 376.8 $ 37.52 " 33.63 " 9.202" 0.190" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 9.057" 91.26 " 183.7 " 83.86 " 31.02 " 8.364" 0.202" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 11.23 " 75.42 " 230.5 " 63.87 " 28.79 " 6.826" 0.202" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 7.881" 51.87 " 158.3 " 53.04 " 26.30 " 7.789" 0.157" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 8.870" 42.20 " 117.1 " 128.5 " 30.88 " 12.74 " 0.121" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 10.27 " 37.98 " 94.63 " 120.0 " 28.89 " 9.751" 0.109" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 8.963" 60.39 " 85.18 " 83.04 " 24.98 " 7.490" 0.109" 20
21 0.000" 0.000" 0.000" 0.000" 0.023" 9.157" 59.77 " 103.2 " 115.5 " 22.84 " 6.294" 0.066" 21
22 0.000" 0.000" 0.000" 0.000" 2.611" 8.710" 49.11 " 248.6 $ 104.6 " 21.37 " 5.569" 0.047" 22
23 0.000" 0.000" 0.000" 0.000" 2.326" 11.63 " 45.32 " 137.8 " 78.77 " 20.98 " 4.690" 0.035" 23
24 0.000" 0.000" 0.000" 0.000" 2.259" 14.18 " 41.36 " 197.4 " 67.35 " 20.95 " 3.584" 0.019" 24
25 0.000" 0.000" 0.000" 0.000" 2.128" 27.03 " 97.42 $ 129.0 " 62.02 " 19.98 " 2.779" 0.008" 25
26 0.000" 0.000" 0.000" 0.000" 1.949" 21.08 " 241.6 $ 100.2 " 65.60 " 18.92 " 2.396" 0.002" 26
27 0.000" 0.000" 0.000" 0.000" 1.793" 20.22 " 141.9 " 90.11 " 77.17 " 18.34 " 2.113" 0.000" 27
28 0.000" 0.000" 0.000" 0.000" 1.663" 57.69 " 212.9 $ 86.37 " 71.30 " 17.25 " 2.096" 0.000" 28
29 0.000" 0.000" 0.000" 1.742" 52.35 " 339.3 $ 76.54 " 59.33 " 15.39 " 2.892" 0.000" 29
30 0.000" 0.000" 0.000" 8.212" 45.44 " 320.9 $ 68.97 " 52.08 " 14.01 " 2.106" 0.000" 30
31 0.000" 0.000" 7.682" 245.6 $ 64.24 " 12.77 " 0.000" 31
Mean 0.000" 0.000" 0.000" 0.000" 1.045" 13.13 " 91.43 $ 127.7 $ 71.00 " 33.62 " 8.949" 0.346"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 8.790" 52.95 $ 100.2 $ 66.23 " 30.88 " 9.403" 0.190"
Maximum 0.000" 0.000" 0.000" 0.000" 8.212" 57.69 " 339.3 $ 376.8 $ 128.5 " 69.18 " 18.90 " 1.674"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 2.653" 24.90 $ 59.62 $ 37.52 " 12.77 " 2.096" 0.000"
Total 0.000" 0.000" 0.000" 0.000" 32.39 " 394.0 "2834 $3960 $2130 "1042 " 268.5 " 10.72 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 29.24 $ " ... Relative Uncertainty +/-10%
Ann. Median 2.396$ $ ... Relative Uncertainty +/-20%
Annual Total 10672 $
Maximum Minimum
Daily 376.8 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2012
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 107.9 " 61.52 " 68.10 " 65.13 " 46.83 " 8.542" 3.632" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 60.60 " 57.64 " 79.70 " 54.19 " 41.20 " 9.039" 2.591" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 35.77 " 50.99 " 211.4 $ 127.1 $ 42.61 " 8.632" 1.998" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 25.50 " 45.88 " 123.1 " 264.9 $ 39.78 " 10.07 " 1.587" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 20.77 " 42.19 " 93.03 " 183.3 " 34.77 " 19.79 " 1.772" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 18.09 " 105.0 " 84.63 " 134.8 " 31.40 " 16.40 " 2.008" 6
7 0.000" 0.000" 0.000" 0.000" 4.404" 26.90 " 115.4 " 100.8 " 99.59 " 28.78 " 12.87 " 1.662" 7
8 0.000" 0.000" 0.000" 0.000" 10.19 " 43.97 " 85.68 " 88.56 " 83.31 " 26.39 " 10.80 " 1.241" 8
9 0.000" 0.000" 0.000" 0.000" 7.595" 28.84 " 73.86 " 74.73 " 71.54 " 24.85 " 8.935" 0.945" 9
10 0.000" 0.000" 0.000" 0.000" 10.21 " 60.90 " 66.54 " 64.66 " 63.97 " 22.90 " 8.136" 0.751" 10
11 0.000" 0.000" 0.000" 0.000" 7.484" 156.0 " 69.62 " 58.01 " 74.84 " 21.19 " 7.812" 0.735" 11
12 0.000" 0.000" 0.000" 0.000" 5.710" 165.8 $ 67.89 " 118.1 " 64.64 " 20.12 " 6.628" 1.396" 12
13 0.000" 0.000" 0.000" 0.000" 5.010" 471.7 $ 60.74 " 146.5 " 55.59 " 20.62 " 5.985" 3.380" 13
14 0.000" 0.000" 0.000" 0.000" 7.052" 201.5 " 56.33 " 110.2 " 50.18 " 24.72 " 5.366" 3.166" 14
15 0.000" 0.000" 0.000" 0.000" 7.889" 186.9 " 52.21 " 104.4 " 45.31 " 24.89 " 4.620" 2.233" 15
16 0.000" 0.000" 0.000" 0.000" 6.539" 121.8 " 64.69 " 83.72 " 41.48 " 21.88 " 3.961" 1.707" 16
17 0.000" 0.000" 0.000" 0.000" 5.846" 98.92 " 60.38 " 72.17 " 39.41 " 19.93 " 3.342" 1.299" 17
18 0.000" 0.000" 0.000" 0.000" 5.335" 84.02 " 53.08 " 63.76 " 38.61 " 18.45 " 2.849" 1.135" 18
19 0.000" 0.000" 0.000" 0.000" 4.786" 141.1 " 49.31 " 57.59 " 35.40 " 17.34 " 2.541" 0.852" 19
20 0.000" 0.000" 0.000" 0.000" 4.076" 128.9 " 46.72 " 57.54 " 38.81 " 15.81 " 2.066" 0.595" 20
21 0.000" 0.000" 0.000" 0.000" 3.659" 105.3 " 43.50 " 70.28 " 46.94 " 14.71 " 1.717" 0.416" 21
22 0.000" 0.000" 0.000" 0.000" 3.322" 82.85 " 40.62 " 73.94 " 52.79 " 22.30 " 1.819" 0.282" 22
23 0.000" 0.000" 0.000" 0.000" 2.934" 71.35 " 46.93 " 63.15 " 44.00 " 21.97 " 1.108" 0.231" 23
24 0.000" 0.000" 0.000" 0.000" 2.659" 62.70 " 54.37 " 57.37 " 38.77 " 17.22 " 1.703" 0.145" 24
25 0.000" 0.000" 0.000" 0.000" 2.463" 56.54 " 46.74 " 50.84 " 41.00 " 14.62 " 1.442" 0.091" 25
26 0.000" 0.000" 0.000" 0.000" 2.284" 58.64 " 43.81 " 47.57 " 57.94 " 12.95 " 1.150" 0.059" 26
27 0.000" 0.000" 0.000" 0.000" 2.113" 79.67 " 41.63 " 48.34 " 99.93 " 11.86 " 0.736" 0.033" 27
28 0.000" 0.000" 0.000" 0.000" 1.901" 70.84 " 38.64 " 45.58 " 82.71 " 10.91 " 0.635" 0.019" 28
29 0.000" 0.000" 0.000" 0.000" 1.738" 62.83 " 35.58 " 44.18 " 64.64 " 9.914" 3.328" 0.010" 29
30 0.000" 0.000" 0.000" 1.681" 58.83 " 33.13 " 40.92 " 54.47 " 9.594" 4.744" 0.004" 30
31 0.000" 0.000" 12.32 " 36.89 " 48.74 " 8.921" 0.000" 31
Mean 0.000" 0.000" 0.000" 0.000" 4.168" 96.51 $ 56.37 " 79.09 $ 73.84 $ 22.56 " 5.892" 1.161"
Median 0.000" 0.000" 0.000" 0.000" 3.659" 71.10 $ 52.21 " 70.28 $ 56.76 $ 21.19 " 4.682" 0.945"
Maximum 0.000" 0.000" 0.000" 0.000" 12.32 " 471.7 $ 115.4 " 211.4 $ 264.9 $ 46.83 " 19.79 " 3.632"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 18.09 $ 33.13 " 40.92 $ 35.40 $ 8.921" 0.635" 0.000"
Total 0.000" 0.000" 0.000" 0.000" 129.2 "2895 $1747 "2452 $2215 $ 699.4 " 176.8 " 35.98 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 28.28 $ " ... Relative Uncertainty +/-10%
Ann. Median 4.240$ $ ... Relative Uncertainty +/-20%
Annual Total 10351 $
Maximum Minimum
Daily 471.7 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2013
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 19.42 " 71.05 " 114.9 " 117.3 " 95.77 " 16.40 " 7.160" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 14.98 " 63.04 " 99.37 " 121.9 " 81.32 " 15.47 " 5.986" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 13.17 " 66.01 " 90.12 " 121.6 " 72.65 " 13.76 " 4.211" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 12.24 " 76.98 " 83.30 " 130.0 " 66.99 " 13.20 " 3.155" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 14.66 " 65.42 " 82.40 " 94.45 " 66.16 " 12.34 " 2.529" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 13.40 " 54.79 " 127.3 " 83.14 " 64.40 " 12.30 " 1.939" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 12.04 " 47.35 " 396.7 $ 76.73 " 59.56 " 12.77 " 1.711" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 12.31 " 42.95 " 406.6 $ 84.03 " 56.89 " 11.12 " 1.666" 8
9 0.000" 0.000" 0.000" 0.000" 2.138" 20.41 " 50.83 " 223.0 $ 71.28 " 55.33 " 9.791" 1.463" 9
10 0.000" 0.000" 0.000" 0.000" 6.702" 22.20 " 65.22 " 151.4 " 69.30 " 48.48 " 8.674" 1.275" 10
11 0.000" 0.000" 0.000" 0.000" 5.824" 18.38 " 55.81 " 148.7 " 173.4 " 47.31 " 7.588" 1.112" 11
12 0.000" 0.000" 0.000" 0.000" 4.183" 15.97 " 49.26 " 126.9 " 186.3 " 45.20 " 6.952" 0.892" 12
13 0.000" 0.000" 0.000" 0.000" 3.608" 14.71 " 49.43 " 123.6 " 157.4 $ 40.48 " 6.439" 0.714" 13
14 0.000" 0.000" 0.000" 0.000" 3.236" 14.36 " 201.9 $ 108.9 " 856.9 $ 36.82 " 5.900" 0.526" 14
15 0.000" 0.000" 0.000" 0.000" 2.953" 13.59 "2116 $ 123.2 " 734.9 $ 35.39 " 4.944" 0.364" 15
16 0.000" 0.000" 0.000" 0.000" 3.216" 15.97 " 760.4 $ 168.6 " 528.7 $ 37.35 " 3.787" 0.293" 16
17 0.000" 0.000" 0.000" 0.000" 17.51 " 21.82 " 505.3 $ 156.2 " 501.9 $ 34.70 " 3.689" 0.217" 17
18 0.000" 0.000" 0.000" 0.000" 16.32 " 21.29 " 281.1 $ 117.3 " 263.4 $ 32.67 " 3.725" 0.148" 18
19 0.000" 0.000" 0.000" 0.000" 13.59 " 20.15 " 191.7 " 97.02 " 199.8 " 39.46 " 3.061" 0.112" 19
20 0.000" 0.000" 0.000" 0.000" 10.81 " 22.29 " 144.6 " 91.87 " 264.1 $ 63.90 " 2.619" 0.097" 20
21 0.000" 0.000" 0.000" 0.000" 8.954" 24.29 " 118.4 " 88.86 " 214.3 $ 49.45 " 2.356" 0.068" 21
22 0.000" 0.000" 0.000" 0.000" 7.636" 22.44 " 101.8 " 80.14 " 252.3 $ 38.37 " 2.645" 0.046" 22
23 0.000" 0.000" 0.000" 0.000" 6.676" 289.0 $ 113.1 " 72.30 " 517.7 $ 32.01 " 4.790" 0.030" 23
24 0.000" 0.000" 0.000" 0.000" 5.851" 304.4 $ 279.7 $ 65.40 " 266.9 $ 28.43 " 4.333" 0.031" 24
25 0.000" 0.000" 0.000" 0.000" 5.208" 200.2 " 161.0 " 106.3 $ 167.1 " 25.73 " 3.917" 0.049" 25
26 0.000" 0.000" 0.000" 0.000" 4.719" 127.7 " 269.7 $ 418.0 $ 133.3 " 23.72 " 3.095" 0.045" 26
27 0.000" 0.000" 0.000" 0.000" 4.468" 101.7 " 328.1 $ 223.9 " 110.5 " 22.43 " 2.493" 0.036" 27
28 0.000" 0.000" 0.000" 0.000" 5.998" 86.07 " 212.4 $ 211.6 " 96.45 " 21.10 " 1.955" 0.026" 28
29 0.000" 0.000" 0.000" 6.630" 89.68 " 166.1 " 144.2 " 103.5 " 19.78 " 2.505" 0.009" 29
30 0.000" 0.000" 0.000" 21.87 " 83.74 " 139.2 " 127.6 " 124.2 " 18.48 " 8.264" 0.002" 30
31 0.000" 0.000" 31.64 " 118.9 " 145.3 " 16.83 " 0.000" 31
Mean 0.000" 0.000" 0.000" 0.000" 6.443" 55.42 $ 224.8 $ 152.3 $ 227.4 $ 44.42 " 7.029" 1.158"
Median 0.000" 0.000" 0.000" 0.000" 4.719" 20.28 $ 118.4 $ 123.6 $ 145.4 $ 39.46 " 5.422" 0.293"
Maximum 0.000" 0.000" 0.000" 0.000" 31.64 " 304.4 $2116 $ 418.0 $ 856.9 $ 95.77 " 16.40 " 7.160"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 12.04 $ 42.95 $ 65.40 $ 69.30 $ 16.83 " 1.955" 0.000"
Total 0.000" 0.000" 0.000" 0.000" 199.7 "1663 $6968 $4721 $6823 $1377 " 210.9 " 35.91 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 60.27 $ " ... Relative Uncertainty +/-10%
Ann. Median 5.851$ $ ... Relative Uncertainty +/-20%
Annual Total 21998 $
Maximum Minimum
Daily 2116 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2014
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 5.506" 38.18 " 72.38 " 150.4 " 45.54 " 10.30 " 5.145" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 5.349" 63.18 " 67.46 " 114.7 " 41.07 " 9.973" 4.106" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 4.671" 62.19 " 61.50 " 97.49 " 37.41 " 15.45 " 3.192" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 4.035" 47.62 " 56.21 " 84.57 " 37.90 " 11.87 " 2.631" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 3.646" 48.63 " 52.07 " 75.94 " 48.51 " 9.966" 2.328" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 3.368" 234.6 $ 48.44 " 81.57 " 51.43 " 9.250" 2.250" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 3.153" 300.6 $ 50.93 " 92.84 " 41.58 " 12.10 " 1.948" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 3.112" 259.8 $ 48.74 " 162.2 " 36.40 " 9.833" 1.609" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 3.654" 153.3 " 44.28 " 139.8 " 34.80 " 7.955" 1.379" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 19.21 " 121.9 " 41.04 " 99.42 " 32.23 " 7.506" 1.079" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 17.11 " 138.4 " 38.44 " 84.88 " 30.27 " 7.308" 0.933" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 11.87 " 109.8 " 35.36 " 75.82 " 29.51 " 8.142" 0.787" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 9.969" 88.33 " 31.86 " 67.79 " 26.45 " 10.26 " 0.413" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 8.633" 167.3 " 31.02 " 62.18 " 24.19 " 8.106" 0.275" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 7.879" 134.4 " 35.59 " 57.86 " 22.52 " 6.760" 0.265" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 7.539" 106.9 " 32.78 " 51.90 " 21.46 " 5.920" 0.236" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 92.32 " 87.19 " 33.05 " 47.82 " 20.04 " 4.781" 0.185" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 87.59 " 74.88 " 97.75 " 43.97 " 19.27 " 4.274" 0.156" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 70.29 " 71.99 " 114.8 " 41.06 " 17.61 " 4.557" 0.121" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 58.24 " 90.42 " 73.96 " 38.57 " 17.62 " 4.284" 0.094" 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 92.62 " 83.76 " 129.4 " 60.06 " 17.26 " 4.766" 0.071" 21
22 0.000" 0.000" 0.000" 0.000" 0.000" 128.9 " 167.1 " 117.8 " 77.82 " 15.65 " 5.145" 0.046" 22
23 0.000" 0.000" 0.000" 0.000" 0.000" 78.35 " 158.4 " 82.87 " 55.66 " 14.53 " 4.503" 0.031" 23
24 0.000" 0.000" 0.000" 0.000" 0.000" 61.17 " 112.1 " 71.24 " 48.91 " 15.78 " 3.694" 0.020" 24
25 0.000" 0.000" 0.000" 0.000" 0.494" 51.77 " 136.5 " 81.93 " 46.53 " 14.58 " 3.073" 0.010" 25
26 0.000" 0.000" 0.000" 0.000" 4.318" 47.92 " 313.5 $ 121.5 " 44.24 " 14.04 " 2.711" 0.005" 26
27 0.000" 0.000" 0.000" 0.000" 5.269" 44.36 " 263.0 $ 95.82 " 74.84 " 13.10 " 4.747" 0.003" 27
28 0.000" 0.000" 0.000" 0.000" 6.800" 37.53 " 168.9 " 93.72 " 67.83 " 12.96 " 18.06 " 0.002" 28
29 0.000" 0.000" 0.000" 4.819" 33.55 " 121.3 " 516.8 $ 60.24 " 11.55 " 9.205" 0.001" 29
30 0.000" 0.000" 0.000" 3.988" 30.88 " 97.98 " 326.2 $ 52.78 " 9.916" 6.534" 0.000" 30
31 0.000" 0.000" 3.553" 83.78 " 218.2 " 11.19 " 0.000" 31
Mean 0.000" 0.000" 0.000" 0.000" 0.943" 34.47 " 132.4 $ 94.29 $ 75.32 " 25.37 " 7.701" 0.946"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 18.16 " 112.1 $ 67.46 $ 67.81 " 21.46 " 7.407" 0.236"
Maximum 0.000" 0.000" 0.000" 0.000" 6.800" 128.9 " 313.5 $ 516.8 $ 162.2 " 51.43 " 18.06 " 5.145"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 3.112" 38.18 $ 31.02 $ 38.57 " 9.916" 2.711" 0.000"
Total 0.000" 0.000" 0.000" 0.000" 29.24 "1034 "4106 $2923 $2260 " 786.4 " 231.0 " 29.32 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 31.23 $ " ... Relative Uncertainty +/-10%
Ann. Median 3.694$ $ ... Relative Uncertainty +/-20%
Annual Total 11399 $
Maximum Minimum
Daily 516.8 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2015
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 6.166" 16.56 " 57.47 " 79.47 " 17.97 " 7.624" 0.017" 1
2 0.000" 0.000" 0.000" 0.000" 0.039" 12.98 " 16.72 " 45.57 " 59.24 " 16.30 " 5.800" 0.011" 2
3 0.000" 0.000" 0.000" 0.000" 0.688" 15.83 " 24.38 " 39.90 " 50.63 " 22.70 " 5.073" 0.009" 3
4 0.000" 0.000" 0.000" 0.000" 2.125" 13.29 " 22.94 " 36.52 " 46.91 " 20.62 " 4.090" 0.007" 4
5 0.000" 0.000" 0.000" 0.000" 2.129" 11.10 " 22.68 " 34.20 " 51.94 " 27.40 " 3.023" 0.007" 5
6 0.000" 0.000" 0.000" 0.000" 1.723" 9.947" 20.58 " 32.47 " 45.86 " 22.18 " 2.803" 0.080" 6
7 0.000" 0.000" 0.000" 0.000" 0.901" 9.863" 20.70 " 30.97 " 40.79 " 18.24 " 2.770" 0.099" 7
8 0.000" 0.000" 0.000" 0.000" 0.933" 9.399" 24.19 " 40.80 " 37.03 " 15.91 " 2.614" 0.060" 8
9 0.000" 0.000" 0.000" 0.000" 1.028" 8.611" 20.68 " 52.63 " 34.14 " 13.85 " 2.579" 0.067" 9
10 0.000" 0.000" 0.000" 0.000" 1.274" 8.022" 27.41 " 60.21 " 42.39 " 12.35 " 2.656" 0.042" 10
11 0.000" 0.000" 0.000" 0.000" 1.452" 7.705" 23.99 " 58.95 " 64.38 " 12.00 " 2.236" 0.019" 11
12 0.000" 0.000" 0.000" 0.000" 1.430" 15.20 " 20.61 " 48.69 " 95.35 " 11.39 " 2.044" 0.011" 12
13 0.000" 0.000" 0.000" 0.000" 1.776" 14.64 " 18.41 " 44.77 " 85.50 " 10.67 " 1.655" 0.008" 13
14 0.000" 0.000" 0.000" 0.000" 1.921" 12.08 " 16.83 " 41.49 " 66.84 " 10.38 " 1.408" 0.005" 14
15 0.000" 0.000" 0.000" 0.000" 1.964" 11.52 " 15.94 " 38.29 " 58.39 " 9.683" 1.150" 0.002" 15
16 0.000" 0.000" 0.000" 0.000" 7.686" 10.92 " 15.10 " 35.05 " 50.92 " 8.563" 0.957" 0.000" 16
17 0.000" 0.000" 0.000" 0.000" 46.61 " 10.42 " 15.63 " 49.82 " 45.33 " 7.995" 0.535" 0.000" 17
18 0.000" 0.000" 0.000" 0.000" 26.21 " 10.39 " 22.96 " 73.55 " 40.96 " 8.505" 0.406" 0.000" 18
19 0.000" 0.000" 0.000" 0.000" 19.11 " 11.11 " 77.56 " 59.92 " 39.45 " 11.00 " 0.354" 0.000" 19
20 0.000" 0.000" 0.000" 0.000" 15.08 " 15.66 " 156.2 " 80.75 " 35.86 " 9.606" 0.287" 0.000" 20
21 0.000" 0.000" 0.000" 0.000" 12.38 " 40.34 " 103.2 " 92.87 " 32.84 " 8.459" 0.255" 0.000" 21
22 0.000" 0.000" 0.000" 0.000" 10.63 " 56.39 " 83.84 " 129.8 " 30.61 " 7.188" 0.147" 0.000" 22
23 0.000" 0.000" 0.000" 0.000" 10.65 " 39.38 " 121.6 " 111.9 " 27.98 " 6.622" 0.110" 0.000" 23
24 0.000" 0.000" 0.000" 0.000" 10.35 " 30.75 " 85.46 " 82.26 " 26.03 " 6.905" 0.093" 0.000" 24
25 0.000" 0.000" 0.000" 0.000" 9.641" 27.12 " 67.87 " 68.57 " 23.78 " 7.308" 0.074" 0.000" 25
26 0.000" 0.000" 0.000" 0.000" 11.08 " 25.30 " 58.53 " 59.78 " 23.15 " 6.260" 0.060" 0.000" 26
27 0.000" 0.000" 0.000" 0.000" 10.04 " 22.58 " 51.35 " 52.85 " 23.37 " 5.007" 0.046" 0.000" 27
28 0.000" 0.000" 0.000" 0.000" 8.458" 20.44 " 47.82 " 47.37 " 22.03 " 3.785" 0.031" 0.000" 28
29 0.000" 0.000" 0.000" 7.517" 18.76 " 44.08 " 49.96 " 20.67 " 3.313" 0.024" 0.000" 29
30 0.000" 0.000" 0.000" 6.810" 17.33 " 40.68 " 58.47 " 19.18 " 3.971" 0.022" 0.000" 30
31 0.000" 0.000" 6.341" 50.52 " 63.49 " 9.693" 0.000" 31
Mean 0.000" 0.000" 0.000" 0.000" 7.677" 17.44 " 43.71 " 57.40 " 44.03 " 11.48 " 1.697" 0.014"
Median 0.000" 0.000" 0.000" 0.000" 6.341" 13.14 " 24.19 " 52.63 " 40.88 " 9.693" 1.054" 0.000"
Maximum 0.000" 0.000" 0.000" 0.000" 46.61 " 56.39 " 156.2 " 129.8 " 95.35 " 27.40 " 7.624" 0.099"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 6.166" 15.10 " 30.97 " 19.18 " 3.313" 0.022" 0.000"
Total 0.000" 0.000" 0.000" 0.000" 238.0 " 523.2 "1355 "1779 "1321 " 355.8 " 50.92 " 0.444"
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 15.41 " " ... Relative Uncertainty +/-10%
Ann. Median 2.044"
Annual Total 5624 "
Maximum Minimum
Daily 156.2 " 0.000"
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2016
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.088" 0.000" 0.000" 0.000" 8.831" 71.41 " 84.27 " 164.4 " 82.19 " 21.54 " 1.536" 1
2 0.000" 0.059" 0.000" 0.000" 0.000" 7.785" 61.22 " 73.51 " 118.0 " 80.85 " 18.62 " 1.333" 2
3 0.000" 0.021" 0.000" 0.000" 0.000" 7.010" 69.52 " 72.60 " 102.6 " 69.94 " 17.44 " 1.049" 3
4 0.000" 0.008" 0.000" 0.000" 0.000" 11.19 " 64.79 " 256.0 $ 89.37 " 65.10 " 17.11 " 0.823" 4
5 0.000" 0.002" 0.000" 0.000" 0.000" 9.696" 54.47 " 141.6 " 79.68 " 59.72 " 15.93 " 0.574" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 8.852" 48.61 " 156.4 $ 73.12 " 60.84 " 15.06 " 0.486" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 40.12 " 44.90 " 304.7 $ 106.9 " 61.83 " 14.63 " 0.388" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 39.33 " 48.50 " 260.0 $ 99.49 " 161.6 " 13.83 " 0.296" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 27.54 " 70.73 " 174.0 " 77.19 " 112.9 " 13.22 " 0.261" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 90.34 " 125.1 " 122.6 " 83.31 " 79.53 " 14.57 " 0.220" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 62.07 " 103.4 " 124.6 " 81.05 " 67.05 " 20.67 " 0.197" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 70.65 " 80.40 " 158.3 " 65.77 " 59.34 " 15.39 " 0.883" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 151.9 " 66.08 " 116.3 " 57.82 " 52.68 " 12.61 " 3.208" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 99.35 " 59.34 " 95.75 " 53.87 " 49.33 " 10.97 " 2.678" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 88.18 " 82.10 " 94.31 " 56.13 " 49.83 " 8.881" 1.749" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 78.81 " 472.3 $ 90.51 " 67.39 " 47.99 " 8.678" 1.254" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 61.26 " 590.3 $ 190.7 $ 57.53 " 45.36 " 8.737" 0.918" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 50.66 " 512.2 $ 232.9 $ 56.83 " 42.26 " 7.743" 0.730" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 53.49 " 256.5 $ 141.9 " 102.4 " 39.28 " 6.950" 0.574" 19
20 0.730" 0.000" 0.000" 0.000" 0.000" 67.23 " 207.0 $ 147.7 " 73.01 " 43.84 " 6.280" 0.428" 20
21 1.047" 0.000" 0.000" 0.000" 0.000" 60.15 " 609.8 $ 133.5 " 60.23 " 38.51 " 5.535" 0.297" 21
22 0.847" 0.000" 0.000" 0.000" 2.023" 54.46 " 334.4 $ 134.5 " 74.98 " 33.33 " 5.077" 0.199" 22
23 0.601" 0.000" 0.000" 0.000" 7.807" 55.45 " 201.6 " 103.2 " 92.00 " 30.30 " 4.617" 0.135" 23
24 0.390" 0.000" 0.000" 0.000" 39.07 " 50.98 " 154.5 " 86.61 " 86.03 " 28.69 " 4.039" 0.095" 24
25 0.250" 0.000" 0.000" 0.000" 20.02 " 61.78 " 127.1 " 76.43 " 98.47 " 26.83 " 3.375" 0.059" 25
26 0.169" 0.000" 0.000" 0.000" 20.75 " 56.67 " 108.3 " 77.93 " 78.73 " 26.79 " 2.900" 0.041" 26
27 0.108" 0.000" 0.000" 0.000" 13.41 " 63.74 " 96.24 " 279.0 $ 81.51 " 23.61 " 2.434" 0.100" 27
28 0.055" 0.000" 0.000" 0.000" 17.90 " 116.0 " 87.97 " 251.0 $ 102.0 " 22.34 " 2.094" 0.098" 28
29 0.021" 0.000" 0.000" 0.000" 14.45 " 110.2 " 87.02 " 196.2 " 79.46 " 23.17 " 1.831" 0.066" 29
30 0.011" 0.000" 0.000" 11.63 " 84.94 " 90.93 " 139.0 " 75.82 " 24.84 " 1.647" 0.044" 30
31 0.026" 0.000" 9.905" 100.1 " 177.9 " 23.24 " 0.033" 31
Mean 0.137" 0.006" 0.000" 0.000" 5.063" 58.29 " 164.1 $ 151.4 $ 83.17 " 52.68 " 10.08 " 0.669"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 58.41 " 90.93 $ 139.0 $ 79.57 " 47.99 " 8.809" 0.388"
Maximum 1.047" 0.088" 0.000" 0.000" 39.07 " 151.9 " 609.8 $ 304.7 $ 164.4 " 161.6 " 21.54 " 3.208"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 7.010" 44.90 $ 72.60 $ 53.87 " 22.34 " 1.647" 0.033"
Total 4.254" 0.178" 0.000" 0.000" 157.0 "1749 "5087 $4694 $2495 "1633 " 302.4 " 20.75 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 44.10 $ " ... Relative Uncertainty +/-10%
Ann. Median 5.306$ $ ... Relative Uncertainty +/-20%
Annual Total 16142 $
Maximum Minimum
Daily 609.8 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2017
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.022" 0.000" 0.000" 0.000" 0.000" 1.602" 8.367" 217.2 " 87.33 " 58.25 " 14.22 " 0.919" 1
2 0.012" 0.000" 0.000" 0.000" 0.000" 1.582" 10.13 " 133.7 " 87.90 " 51.41 " 13.56 " 0.772" 2
3 0.006" 0.000" 0.000" 0.000" 0.000" 2.160" 9.544" 116.2 " 67.41 " 48.26 " 12.71 " 0.596" 3
4 0.002" 0.000" 0.000" 0.000" 0.000" 2.224" 12.69 " 104.7 " 59.16 " 40.91 " 11.70 " 1.088" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 2.168" 16.40 " 87.15 " 53.45 " 36.32 " 10.56 " 2.898" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 2.058" 17.87 " 75.45 " 48.76 " 34.81 " 9.562" 3.381" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 1.844" 25.75 " 78.81 " 44.92 " 44.35 " 8.510" 2.413" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 1.620" 20.93 " 349.2 $ 43.45 " 41.02 " 7.389" 1.634" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 1.508" 18.20 " 487.7 $ 41.10 " 35.77 " 6.353" 1.361" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 1.501" 23.30 " 281.1 $ 39.99 " 34.58 " 5.258" 1.280" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 1.513" 79.71 " 193.3 " 45.39 " 30.54 " 4.597" 0.926" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 1.446" 70.47 " 261.3 $ 40.62 " 28.51 " 4.192" 0.608" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 2.649" 52.38 " 266.5 $ 34.71 " 27.01 " 4.131" 0.411" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 13.35 " 43.28 " 256.5 $ 32.66 " 26.51 " 3.709" 0.354" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 7.884" 44.86 " 202.4 " 32.01 " 26.07 " 3.084" 0.247" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 4.962" 49.44 " 172.3 " 30.15 " 30.28 " 2.792" 0.215" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 4.711" 37.12 " 140.1 " 29.46 " 36.68 " 2.778" 0.321" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 4.527" 34.51 " 210.6 " 28.28 " 33.26 " 2.804" 14.89 " 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 4.018" 89.72 " 261.8 $ 28.01 " 26.85 " 2.909" 19.35 " 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 4.628" 128.6 " 235.5 $ 27.57 " 23.48 " 2.883" 9.430" 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 6.738" 94.65 " 154.8 " 39.36 " 21.41 " 2.661" 5.271" 21
22 0.000" 0.000" 0.000" 0.000" 0.000" 8.664" 91.29 " 145.0 " 48.54 " 33.10 " 2.263" 3.371" 22
23 0.000" 0.000" 0.000" 0.000" 0.000" 8.872" 85.58 " 126.3 " 45.71 " 29.66 " 1.932" 2.221" 23
24 0.000" 0.000" 0.000" 0.000" 0.093" 7.464" 87.09 " 98.80 " 39.63 " 24.56 " 1.688" 1.839" 24
25 0.000" 0.000" 0.000" 0.000" 1.203" 5.877" 85.97 " 86.63 " 76.56 " 21.39 " 1.456" 1.517" 25
26 0.000" 0.000" 0.000" 0.000" 1.745" 5.035" 97.27 " 76.94 " 146.1 " 20.64 " 1.257" 0.789" 26
27 0.000" 0.000" 0.000" 0.000" 2.027" 4.600" 100.8 " 69.42 " 97.15 " 22.94 " 1.104" 0.460" 27
28 0.000" 0.000" 0.000" 0.000" 2.051" 4.411" 165.8 " 63.60 " 99.90 " 19.69 " 1.043" 0.326" 28
29 0.000" 0.000" 0.000" 1.909" 4.151" 136.1 " 58.54 " 84.04 " 17.81 " 0.984" 0.297" 29
30 0.000" 0.000" 0.000" 1.801" 5.341" 128.1 " 54.24 " 67.93 " 15.88 " 1.001" 0.199" 30
31 0.000" 0.000" 1.677" 150.1 " 64.82 " 15.00 " 0.163" 31
Mean 0.001" 0.000" 0.000" 0.000" 0.403" 4.304" 65.03 " 165.5 $ 54.91 " 30.87 " 4.970" 2.566"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 4.281" 52.38 " 140.1 $ 45.15 " 29.66 " 2.996" 0.926"
Maximum 0.022" 0.000" 0.000" 0.000" 2.051" 13.35 " 165.8 " 487.7 $ 146.1 " 58.25 " 14.22 " 19.35 "
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 1.446" 8.367" 54.24 $ 27.57 " 15.00 " 0.984" 0.163"
Total 0.043" 0.000" 0.000" 0.000" 12.51 " 129.1 "2016 "5131 $1647 " 957.0 " 149.1 " 79.55 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 27.73 $ " ... Relative Uncertainty +/-10%
Ann. Median 1.801$ $ ... Relative Uncertainty +/-20%
Annual Total 10121 $
Maximum Minimum
Daily 487.7 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2018
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.098" 0.000" 0.000" 0.000" 0.000" 6.441" 42.71 " 106.3 " 178.9 " 26.10 " 10.38 " 1.970" 1
2 0.060" 0.000" 0.000" 0.000" 0.000" 4.994" 335.7 $ 130.7 " 143.8 " 25.53 " 9.603" 1.265" 2
3 0.040" 0.000" 0.000" 0.000" 0.000" 4.294" 235.2 $ 135.6 " 120.4 " 23.84 " 9.574" 1.377" 3
4 0.029" 0.000" 0.000" 0.000" 0.000" 4.041" 177.3 " 206.5 " 107.8 " 27.18 " 8.955" 1.284" 4
5 0.021" 0.000" 0.000" 0.000" 0.000" 37.11 " 177.6 " 188.5 " 106.3 " 29.88 " 8.833" 1.469" 5
6 0.022" 0.000" 0.000" 0.000" 0.000" 30.77 " 120.6 " 133.5 " 100.6 " 32.36 " 8.509" 7.151" 6
7 0.020" 0.000" 0.000" 0.000" 0.000" 19.02 " 94.46 " 115.6 " 97.72 " 29.13 " 8.313" 7.593" 7
8 0.017" 0.000" 0.000" 0.000" 0.000" 16.05 " 79.87 " 100.6 " 97.34 " 25.30 " 7.180" 4.093" 8
9 0.012" 0.000" 0.000" 0.000" 0.000" 30.72 " 69.08 " 195.6 " 92.00 " 22.78 " 6.268" 2.786" 9
10 0.008" 0.000" 0.000" 0.000" 0.000" 53.99 " 61.20 " 192.8 " 87.27 " 21.48 " 5.462" 2.091" 10
11 0.005" 0.000" 0.000" 0.000" 0.000" 43.72 " 54.37 " 142.4 " 80.05 " 21.06 " 5.265" 1.707" 11
12 0.004" 0.000" 0.000" 0.000" 0.000" 36.64 " 50.13 " 111.0 " 69.80 " 19.68 " 4.561" 1.446" 12
13 0.003" 0.000" 0.000" 0.000" 0.000" 29.91 " 61.19 " 96.95 " 68.22 " 22.30 " 4.791" 1.098" 13
14 0.002" 0.000" 0.000" 0.000" 0.000" 25.99 " 65.33 " 153.3 " 65.55 " 51.97 " 4.744" 0.901" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 26.76 " 94.76 " 108.1 " 56.58 " 45.37 " 4.174" 0.780" 15
16 0.036" 0.000" 0.000" 0.000" 0.000" 26.82 " 82.49 " 95.26 " 53.75 " 31.68 " 3.715" 0.870" 16
17 0.122" 0.000" 0.000" 0.000" 0.000" 23.38 " 75.11 " 100.6 " 54.83 " 26.45 " 3.414" 1.090" 17
18 0.087" 0.000" 0.000" 0.000" 0.000" 56.96 " 67.49 " 83.95 " 50.83 " 25.32 " 3.291" 1.027" 18
19 0.058" 0.000" 0.000" 0.000" 0.000" 71.14 " 62.73 " 73.11 " 48.23 " 23.19 " 3.351" 0.495" 19
20 0.042" 0.000" 0.000" 0.000" 0.000" 64.92 " 55.79 " 67.56 " 44.83 " 20.61 " 3.139" 0.240" 20
21 0.032" 0.000" 0.000" 0.000" 0.000" 53.30 " 159.3 " 74.44 " 41.87 " 20.00 " 3.054" 0.170" 21
22 0.022" 0.000" 0.000" 0.000" 0.000" 50.05 " 205.8 " 77.63 " 39.02 " 18.38 " 3.053" 0.118" 22
23 0.012" 0.000" 0.000" 0.000" 0.000" 41.15 " 181.0 " 68.27 " 36.83 " 16.81 " 3.046" 0.082" 23
24 0.005" 0.000" 0.000" 0.000" 0.000" 35.20 " 141.2 " 61.49 " 35.02 " 18.82 " 2.935" 0.062" 24
25 0.001" 0.000" 0.000" 0.000" 0.000" 31.09 " 179.1 $ 56.44 " 32.76 " 24.64 " 3.165" 0.046" 25
26 0.000" 0.000" 0.000" 0.000" 0.286" 31.32 " 302.9 $ 52.19 " 30.87 " 19.18 " 4.920" 0.036" 26
27 0.000" 0.000" 0.000" 0.000" 3.494" 58.50 " 174.6 " 55.76 " 30.33 " 15.97 " 4.047" 0.046" 27
28 0.000" 0.000" 0.000" 0.000" 2.913" 47.26 " 133.8 " 132.9 " 28.91 " 14.26 " 3.008" 0.057" 28
29 0.000" 0.000" 0.000" 4.881" 37.63 " 107.8 " 503.2 $ 27.27 " 13.30 " 2.596" 0.045" 29
30 0.000" 0.000" 0.000" 14.51 " 36.03 " 102.9 " 619.7 $ 28.04 " 12.46 " 2.170" 0.031" 30
31 0.000" 0.000" 8.620" 88.97 " 258.3 $ 11.21 " 0.029" 31
Mean 0.025" 0.000" 0.000" 0.000" 1.119" 34.51 " 123.9 $ 145.1 $ 68.53 " 23.75 " 5.184" 1.337"
Median 0.012" 0.000" 0.000" 0.000" 0.000" 33.26 " 94.76 $ 108.1 $ 55.71 " 22.78 " 4.367" 0.901"
Maximum 0.122" 0.000" 0.000" 0.000" 14.51 " 71.14 " 335.7 $ 619.7 $ 178.9 " 51.97 " 10.38 " 7.593"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 4.041" 42.71 $ 52.19 $ 27.27 " 11.21 " 2.170" 0.029"
Total 0.761" 0.000" 0.000" 0.000" 34.70 "1035 "3840 $4498 $2056 " 736.2 " 155.5 " 41.45 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 33.97 $ " ... Relative Uncertainty +/-10%
Ann. Median 3.139$ $ ... Relative Uncertainty +/-20%
Annual Total 12398 $
Maximum Minimum
Daily 619.7 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2019
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.028" 0.002" 0.000" 0.000" 0.000" 0.000" 54.39 " 34.11 " 86.86 " 22.73 " 17.86 " 0.158" 1
2 0.020" 0.000" 0.000" 0.000" 0.000" 0.000" 44.71 " 32.07 " 112.4 " 18.51 " 17.97 " 0.149" 2
3 0.021" 0.000" 0.000" 0.000" 0.000" 0.000" 37.64 " 32.06 " 106.7 " 21.28 " 14.67 " 0.121" 3
4 0.016" 0.000" 0.000" 0.000" 0.000" 0.000" 82.22 " 35.65 " 91.75 " 70.46 " 11.80 " 0.086" 4
5 0.013" 0.000" 0.000" 0.000" 0.000" 0.000" 146.9 " 46.85 " 75.73 " 59.03 " 10.30 " 0.071" 5
6 0.008" 0.000" 0.000" 0.000" 0.000" 0.000" 105.5 " 61.47 " 64.41 " 38.73 " 8.719" 0.056" 6
7 0.005" 0.000" 0.000" 0.000" 0.000" 6.849" 101.4 " 48.24 " 57.29 " 30.09 " 7.201" 0.391" 7
8 0.002" 0.000" 0.000" 0.000" 0.000" 12.57 " 135.0 " 42.58 " 51.61 " 25.81 " 5.616" 0.853" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 18.43 " 120.7 " 39.04 " 47.36 " 23.38 " 4.514" 0.697" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 25.50 " 94.81 " 35.67 " 43.39 " 22.03 " 3.671" 0.597" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 41.01 " 79.69 " 32.37 " 39.87 " 20.39 " 3.533" 0.444" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 35.20 " 67.19 " 30.05 " 38.34 " 18.89 " 2.918" 0.338" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 34.62 " 59.26 " 31.97 " 37.53 " 17.89 " 2.387" 0.239" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 44.57 " 52.97 " 49.69 " 35.68 " 19.32 " 1.872" 0.134" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 45.02 " 47.89 " 69.39 " 32.85 " 16.62 " 1.842" 0.082" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 36.06 " 43.87 " 52.71 " 30.06 " 15.24 " 1.194" 0.052" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 37.41 " 40.88 " 78.19 " 28.40 " 14.12 " 1.053" 0.038" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 30.25 " 43.16 " 59.81 " 28.21 " 13.34 " 1.084" 0.025" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 24.76 " 48.16 " 51.34 " 38.04 " 12.48 " 0.853" 0.021" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 21.49 " 86.25 " 46.03 " 33.81 " 11.69 " 0.772" 0.022" 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 19.15 " 73.63 " 42.04 " 29.85 " 10.83 " 0.910" 0.017" 21
22 0.000" 0.000" 0.000" 0.000" 0.000" 23.57 " 65.72 " 40.28 " 27.04 " 10.40 " 0.712" 0.009" 22
23 0.003" 0.000" 0.000" 0.000" 0.000" 81.37 " 57.19 " 73.21 " 24.22 " 10.21 " 0.585" 0.004" 23
24 0.048" 0.000" 0.000" 0.000" 0.000" 69.13 " 61.24 " 62.57 " 22.72 " 10.04 " 0.545" 0.001" 24
25 0.063" 0.000" 0.000" 0.000" 0.000" 49.58 " 71.84 " 49.42 " 21.40 " 9.308" 0.415" 0.000" 25
26 0.048" 0.000" 0.000" 0.000" 0.000" 47.93 " 58.68 " 42.96 " 20.56 " 8.983" 0.332" 0.000" 26
27 0.034" 0.000" 0.000" 0.000" 0.000" 54.31 " 54.53 " 39.02 " 20.13 " 8.583" 0.284" 0.000" 27
28 0.023" 0.000" 0.000" 0.000" 0.000" 60.65 " 47.89 " 36.17 " 18.60 " 6.945" 0.246" 0.000" 28
29 0.015" 0.000" 0.000" 0.000" 52.60 " 43.34 " 38.12 " 17.92 " 6.617" 0.208" 0.000" 29
30 0.012" 0.000" 0.000" 0.000" 53.55 " 40.01 " 85.33 " 18.14 " 9.145" 0.178" 0.000" 30
31 0.006" 0.000" 0.000" 36.85 " 86.25 " 18.17 " 0.000" 31
Mean 0.012" 0.000" 0.000" 0.000" 0.000" 30.85 " 67.86 " 48.54 " 43.36 " 19.40 " 4.141" 0.149"
Median 0.003" 0.000" 0.000" 0.000" 0.000" 32.43 " 58.68 " 42.96 " 34.74 " 16.62 " 1.518" 0.052"
Maximum 0.063" 0.002" 0.000" 0.000" 0.000" 81.37 " 146.9 " 86.25 " 112.4 " 70.46 " 17.97 " 0.853"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 36.85 " 30.05 " 17.92 " 6.617" 0.178" 0.000"
Total 0.366" 0.002" 0.000" 0.000" 0.000" 925.6 "2104 "1505 "1301 " 601.3 " 124.2 " 4.604"
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 17.99 " " ... Relative Uncertainty +/-10%
Ann. Median 0.208"
Annual Total 6565 "
Maximum Minimum
Daily 146.9 " 0.000"
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2020
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 4.693" 32.24 " 80.30 " 91.26 " 39.68 " 19.75 " 5.616" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 4.114" 27.40 " 100.4 " 91.17 " 37.91 " 20.09 " 4.554" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 4.148" 24.27 " 168.1 " 74.79 " 36.66 " 21.32 " 3.864" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 3.816" 21.85 " 218.2 $ 64.70 " 33.44 " 16.18 " 3.457" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 3.565" 33.85 " 260.5 $ 61.93 " 31.07 " 13.17 " 3.167" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 3.364" 131.5 " 145.4 " 192.6 $ 28.48 " 10.43 " 2.885" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 4.170" 144.0 " 107.8 " 298.0 $ 30.02 " 9.219" 2.643" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 5.138" 93.98 " 92.06 " 149.4 " 70.49 " 7.786" 1.967" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 4.299" 74.09 " 101.4 " 113.4 " 50.42 " 13.49 " 1.788" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 3.926" 63.97 " 370.4 $ 236.8 $ 38.15 " 28.66 " 1.119" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 6.334" 52.02 " 302.1 $ 139.5 " 32.04 " 19.35 " 0.670" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 10.16 " 46.74 " 196.6 " 99.94 " 29.14 " 15.82 " 0.505" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 7.292" 77.90 " 135.3 " 86.10 " 25.92 " 19.80 " 0.517" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 5.380" 170.2 " 109.6 " 77.91 " 25.24 " 17.83 " 0.371" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 4.576" 121.9 " 122.7 " 70.88 " 24.00 " 19.07 " 0.250" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 4.542" 146.6 " 292.8 $ 63.77 " 22.13 " 15.71 " 0.285" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 5.641" 134.6 " 217.3 " 57.32 " 20.48 " 13.07 " 0.254" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 9.587" 119.7 " 158.9 " 53.11 " 18.88 " 13.69 " 0.193" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 8.676" 94.44 " 120.3 " 58.53 " 18.28 " 13.52 " 0.186" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 7.876" 79.58 " 109.2 " 66.48 " 17.09 " 11.95 " 0.127" 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 7.217" 68.65 " 100.6 " 58.54 " 16.42 " 11.45 " 0.135" 21
22 0.000" 0.000" 0.000" 0.000" 0.000" 8.725" 87.99 $ 86.68 " 59.04 " 16.20 " 9.158" 0.112" 22
23 0.000" 0.000" 0.000" 0.000" 0.000" 20.70 " 409.0 $ 80.29 " 51.68 " 15.09 " 7.242" 0.083" 23
24 0.000" 0.000" 0.000" 0.000" 0.000" 13.79 " 168.5 " 73.04 " 45.32 " 13.73 " 6.059" 0.060" 24
25 0.000" 0.000" 0.000" 0.000" 0.000" 11.41 " 113.5 " 65.65 " 40.15 " 12.77 " 5.309" 0.046" 25
26 0.000" 0.000" 0.000" 0.000" 0.000" 13.23 " 140.0 " 61.01 " 40.70 " 11.68 " 4.927" 0.025" 26
27 0.000" 0.000" 0.000" 0.000" 0.139" 14.07 " 127.6 " 59.38 " 50.66 " 11.08 " 4.255" 0.013" 27
28 0.000" 0.000" 0.000" 0.000" 1.610" 19.40 " 192.6 " 59.10 " 44.47 " 10.63 " 4.031" 0.012" 28
29 0.000" 0.000" 0.000" 0.000" 5.307" 29.61 " 119.4 " 58.12 " 41.99 " 9.276" 3.865" 0.006" 29
30 0.000" 0.000" 0.000" 6.811" 35.76 " 92.82 " 51.67 " 42.01 " 7.959" 5.192" 0.003" 30
31 0.000" 0.000" 5.865" 85.71 " 48.71 " 7.486" 0.001" 31
Mean 0.000" 0.000" 0.000" 0.000" 0.637" 9.507" 106.3 $ 134.0 $ 87.40 $ 24.58 " 12.71 " 1.126"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 6.776" 93.98 $ 107.8 $ 64.24 $ 22.13 " 13.12 " 0.254"
Maximum 0.000" 0.000" 0.000" 0.000" 6.811" 35.76 " 409.0 $ 370.4 $ 298.0 $ 70.49 " 28.66 " 5.616"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 3.364" 21.85 $ 48.71 $ 40.15 $ 7.486" 3.865" 0.001"
Total 0.000" 0.000" 0.000" 0.000" 19.73 " 285.2 "3297 $4154 $2622 $ 761.8 " 381.4 " 34.92 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 31.57 $ " ... Relative Uncertainty +/-10%
Ann. Median 3.979$ $ ... Relative Uncertainty +/-20%
Annual Total 11555 $
Maximum Minimum
Daily 409.0 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2021
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 1.827" 37.26 " 159.6 " 322.2 $ 66.74 " 59.05 " 30.27 " 3.060" 1
2 0.001" 0.000" 0.000" 0.000" 1.912" 26.01 " 124.8 " 234.9 $ 63.30 " 69.93 " 27.52 " 2.848" 2
3 0.000" 0.000" 0.000" 0.000" 2.608" 20.52 " 109.8 " 170.7 " 65.06 " 70.44 " 25.32 " 2.574" 3
4 0.000" 0.000" 0.000" 0.000" 2.090" 17.46 " 128.1 " 140.8 " 59.55 " 60.38 " 22.98 " 2.238" 4
5 0.000" 0.000" 0.000" 0.000" 1.867" 15.11 " 173.4 " 115.4 " 54.12 " 79.63 " 21.48 " 1.984" 5
6 0.000" 0.000" 0.000" 0.000" 1.715" 17.09 " 189.9 $ 98.06 " 49.34 " 62.28 " 20.55 " 1.722" 6
7 0.000" 0.000" 0.000" 0.000" 1.768" 21.00 " 284.7 $ 94.40 " 45.23 " 52.60 " 20.17 " 1.470" 7
8 0.000" 0.000" 0.000" 0.000" 1.662" 17.33 " 209.9 " 294.8 $ 48.02 " 51.03 " 19.24 " 0.885" 8
9 0.000" 0.000" 0.000" 0.000" 1.600" 16.46 " 232.8 $ 279.9 $ 124.6 " 46.29 " 16.83 " 0.653" 9
10 0.000" 0.000" 0.000" 0.000" 1.468" 64.85 " 300.9 $ 369.4 $ 101.0 " 41.74 " 14.82 " 0.685" 10
11 0.000" 0.000" 0.000" 0.000" 1.338" 61.17 " 177.1 " 275.8 $ 83.12 " 47.79 " 14.11 " 0.575" 11
12 0.000" 0.000" 0.000" 0.000" 1.539" 42.81 " 235.2 $ 187.0 " 72.02 " 64.17 " 13.38 " 0.637" 12
13 0.000" 0.000" 0.000" 0.000" 1.585" 34.85 " 316.2 $ 167.5 " 63.61 " 52.37 " 12.98 " 0.563" 13
14 0.000" 0.000" 0.000" 0.000" 1.430" 42.27 " 285.7 $ 179.3 " 58.05 " 44.86 " 11.73 " 0.395" 14
15 0.000" 0.000" 0.000" 0.000" 1.364" 41.95 " 276.7 $ 134.4 " 57.17 " 40.32 " 10.51 " 0.304" 15
16 0.000" 0.000" 0.000" 0.002" 1.284" 36.47 " 181.4 " 107.9 " 128.5 " 37.14 " 10.22 " 0.270" 16
17 0.000" 0.000" 0.000" 0.031" 1.263" 31.67 " 144.3 " 94.77 " 106.6 " 33.95 " 9.819" 0.263" 17
18 0.000" 0.000" 0.000" 0.073" 1.966" 28.87 " 157.8 " 92.01 " 93.09 " 31.37 " 8.797" 0.266" 18
19 0.000" 0.000" 0.000" 0.093" 2.314" 32.31 " 175.5 " 113.3 " 93.27 " 35.66 " 7.741" 0.256" 19
20 0.000" 0.000" 0.000" 0.146" 2.005" 102.5 " 161.5 " 92.98 " 78.18 " 74.98 " 7.263" 0.196" 20
21 0.000" 0.000" 0.000" 0.181" 1.722" 247.0 $ 144.4 " 84.26 " 66.11 " 81.40 " 7.038" 0.160" 21
22 0.000" 0.000" 0.000" 0.189" 3.403" 145.4 " 132.8 " 80.53 " 57.07 " 54.62 " 9.625" 0.126" 22
23 0.000" 0.000" 0.000" 0.202" 13.27 " 100.7 " 114.5 " 72.30 " 52.16 " 44.75 " 9.018" 0.093" 23
24 0.000" 0.000" 0.000" 0.185" 14.73 " 79.85 " 100.8 " 64.17 " 47.36 " 40.49 " 6.963" 0.067" 24
25 0.000" 0.000" 0.000" 0.163" 9.984" 67.56 " 91.69 " 60.82 " 43.46 " 37.72 " 5.658" 0.044" 25
26 0.000" 0.000" 0.000" 0.155" 7.068" 60.65 " 84.35 " 68.57 " 41.57 " 43.21 " 4.827" 0.027" 26
27 0.000" 0.000" 0.000" 0.148" 5.571" 201.3 $ 91.11 " 68.64 " 53.93 " 43.74 " 4.260" 0.012" 27
28 0.000" 0.000" 0.000" 0.141" 5.098" 407.5 $ 92.58 " 63.33 " 55.15 " 37.82 " 3.746" 0.004" 28
29 0.000" 0.000" 1.051" 6.879" 251.5 $ 154.7 " 80.46 " 47.49 " 33.33 " 3.524" 0.001" 29
30 0.000" 0.000" 2.734" 41.53 " 199.1 " 170.9 " 76.82 " 40.52 " 30.89 " 3.315" 0.000" 30
31 0.000" 0.000" 36.99 " 175.0 " 70.41 " 29.09 " 0.000" 31
Mean 0.000" 0.000" 0.000" 0.183" 5.834" 82.28 $ 173.5 $ 140.5 $ 67.18 " 49.45 " 12.79 " 0.722"
Median 0.000" 0.000" 0.000" 0.001" 1.912" 42.11 $ 161.5 $ 98.06 $ 58.80 " 44.86 " 10.37 " 0.270"
Maximum 0.001" 0.000" 0.000" 2.734" 41.53 " 407.5 $ 316.2 $ 369.4 $ 128.5 " 81.40 " 30.27 " 3.060"
Minimum 0.000" 0.000" 0.000" 0.000" 1.263" 15.11 $ 84.35 $ 60.82 $ 40.52 " 29.09 " 3.315" 0.000"
Total 0.002" 0.000" 0.000" 5.493" 180.8 "2469 $5378 $4356 $2015 "1533 " 383.7 " 22.38 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 44.78 $ " ... Relative Uncertainty +/-10%
Ann. Median 6.963$ $ ... Relative Uncertainty +/-20%
Annual Total 16343 $
Maximum Minimum
Daily 407.5 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2022
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 4.384" 22.46 " 268.5 $ 41.41 " 27.27 " 18.88 " 2.625" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 9.934" 20.93 " 351.5 $ 38.96 " 26.75 " 16.13 " 2.442" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 12.40 " 19.78 " 325.6 $ 37.33 " 24.17 " 14.31 " 2.193" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 9.683" 18.72 " 263.4 $ 37.28 " 23.35 " 12.76 " 1.993" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 8.091" 30.33 " 170.6 " 48.76 " 29.13 " 11.28 " 1.833" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 6.944" 30.59 " 136.0 " 45.56 " 27.37 " 10.20 " 1.664" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 5.965" 24.42 " 160.1 " 47.49 " 24.02 " 9.475" 1.381" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 5.490" 22.45 " 147.8 " 42.81 " 21.74 " 8.580" 1.170" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 6.439" 78.01 " 390.7 $ 39.02 " 21.31 " 7.645" 1.006" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 15.31 " 115.1 " 378.1 $ 35.57 " 22.30 " 7.877" 0.891" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 27.43 " 76.42 " 212.1 $ 31.71 " 20.69 " 11.56 " 0.776" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 32.90 " 67.13 " 148.2 " 30.07 " 21.09 " 10.35 " 0.622" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 37.53 " 83.82 " 155.7 " 112.4 " 19.03 " 8.819" 0.473" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 28.12 " 83.68 " 203.4 " 107.3 " 21.40 " 7.842" 0.354" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 25.84 " 118.7 " 133.2 " 73.39 " 23.91 " 6.941" 0.263" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 46.21 " 92.19 " 175.4 " 61.07 " 19.85 " 6.297" 0.200" 16
17 0.000" 0.000" 0.000" 0.000" 0.005" 48.12 " 78.48 " 180.5 " 54.30 " 18.80 " 6.417" 0.154" 17
18 0.000" 0.000" 0.000" 0.000" 0.435" 81.35 " 79.06 " 143.0 " 50.12 " 16.96 " 8.577" 0.121" 18
19 0.000" 0.000" 0.000" 0.000" 0.976" 61.37 " 68.54 " 108.5 " 65.32 " 15.68 " 10.09 " 0.095" 19
20 0.000" 0.000" 0.000" 0.000" 1.039" 53.43 " 60.83 " 95.63 " 61.18 " 15.18 " 8.779" 0.068" 20
21 0.000" 0.000" 0.000" 0.000" 1.145" 46.34 " 141.4 " 89.94 " 50.96 " 15.45 " 7.336" 0.049" 21
22 0.000" 0.000" 0.000" 0.000" 1.721" 42.28 " 150.3 " 80.03 " 51.12 " 14.21 " 5.822" 0.038" 22
23 0.000" 0.000" 0.000" 0.000" 7.796" 47.06 " 191.9 " 69.88 " 45.56 " 13.23 " 4.865" 0.030" 23
24 0.000" 0.000" 0.000" 0.000" 17.10 " 45.80 " 218.7 " 64.30 " 51.21 " 15.32 " 4.106" 0.024" 24
25 0.000" 0.000" 0.000" 0.000" 11.65 " 37.71 " 141.6 " 60.60 " 49.00 " 21.71 " 4.281" 0.027" 25
26 0.000" 0.000" 0.000" 0.000" 8.209" 32.39 " 131.3 " 58.22 " 45.37 " 16.97 " 6.271" 0.027" 26
27 0.000" 0.000" 0.000" 0.000" 6.586" 31.08 " 130.2 " 53.79 " 40.11 " 16.23 " 5.048" 0.027" 27
28 0.000" 0.000" 0.000" 0.000" 5.691" 30.15 " 95.61 " 53.21 " 36.51 " 14.10 " 3.977" 0.015" 28
29 0.000" 0.000" 0.000" 5.148" 27.10 " 123.0 " 50.85 " 33.37 " 13.96 " 3.552" 0.010" 29
30 0.000" 0.000" 0.000" 4.703" 24.39 " 151.9 " 47.65 " 31.05 " 25.03 " 3.026" 0.007" 30
31 0.000" 0.000" 4.552" 135.6 " 44.71 " 23.99 " 0.005" 31
Mean 0.000" 0.000" 0.000" 0.000" 2.476" 29.71 " 90.42 " 155.5 $ 49.84 " 20.33 " 8.370" 0.664"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 29.14 " 83.68 " 143.0 $ 45.56 " 21.09 " 7.859" 0.200"
Maximum 0.000" 0.000" 0.000" 0.000" 17.10 " 81.35 " 218.7 " 390.7 $ 112.4 " 29.13 " 18.88 " 2.625"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 4.384" 18.72 " 44.71 $ 30.07 " 13.23 " 3.026" 0.005"
Total 0.000" 0.000" 0.000" 0.000" 76.76 " 891.2 "2803 "4821 $1495 " 630.2 " 251.1 " 20.58 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 30.11 $ " ... Relative Uncertainty +/-10%
Ann. Median 5.048$ $ ... Relative Uncertainty +/-20%
Annual Total 10989 $
Maximum Minimum
Daily 390.7 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2023
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.004" 0.000" 0.000" 0.000" 0.000" 1.729" 39.97 " 77.09 " 31.60 " 17.76 " 3.751" 0.011" 1
2 0.003" 0.000" 0.000" 0.000" 0.000" 1.540" 36.90 " 199.9 $ 34.42 " 26.24 " 3.140" 0.008" 2
3 0.001" 0.000" 0.000" 0.000" 0.000" 1.373" 63.18 " 339.9 $ 51.30 " 23.30 " 2.587" 0.015" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 1.335" 79.13 " 163.1 " 47.80 " 19.88 " 2.218" 0.016" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 5.838" 74.81 " 116.9 " 42.87 " 18.70 " 1.920" 0.017" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 29.74 " 70.22 " 95.44 " 58.89 " 17.37 " 1.505" 0.011" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 26.50 " 69.57 " 83.27 " 47.31 " 15.81 " 1.022" 0.005" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 19.82 " 62.80 " 99.28 " 39.16 " 14.27 " 0.849" 0.002" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 16.55 " 57.04 " 95.86 " 34.89 " 13.71 " 0.848" 0.000" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 17.01 " 66.21 " 78.30 " 32.55 " 12.87 " 0.656" 0.000" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 26.38 " 67.36 " 70.30 " 30.04 " 11.54 " 0.514" 0.000" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 31.00 " 65.35 " 63.96 " 30.65 " 10.20 " 0.493" 0.000" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 61.95 " 78.62 " 57.90 " 66.69 " 9.698" 0.428" 0.000" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 73.47 " 76.36 " 55.82 " 89.60 " 9.389" 0.290" 0.000" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 55.00 " 63.49 " 64.48 " 63.86 " 8.855" 0.277" 0.000" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 60.89 " 54.69 " 104.4 " 56.72 " 8.072" 0.264" 0.000" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 55.66 " 66.83 " 79.66 " 49.59 " 7.192" 0.201" 0.000" 17
18 0.000" 0.000" 0.000" 0.000" 0.139" 42.37 " 83.79 " 66.67 " 42.37 " 6.719" 0.166" 0.000" 18
19 0.000" 0.000" 0.000" 0.000" 0.491" 35.81 " 168.8 " 59.61 " 40.28 " 6.481" 0.134" 0.000" 19
20 0.000" 0.000" 0.000" 0.000" 0.290" 58.29 " 107.6 " 54.77 " 39.29 " 5.944" 0.106" 0.000" 20
21 0.000" 0.000" 0.000" 0.000" 0.262" 60.40 " 108.1 " 51.50 " 36.29 " 5.603" 0.085" 0.000" 21
22 0.000" 0.000" 0.000" 0.000" 0.307" 53.70 " 91.67 " 47.87 " 32.54 " 5.769" 0.072" 0.000" 22
23 0.000" 0.000" 0.000" 0.000" 0.642" 58.02 " 76.07 " 54.60 " 29.66 " 6.555" 0.057" 0.000" 23
24 0.000" 0.000" 0.000" 0.000" 1.630" 60.47 " 66.59 " 53.23 " 27.32 " 5.680" 0.041" 0.000" 24
25 0.000" 0.000" 0.000" 0.000" 1.309" 66.34 " 86.88 " 47.33 " 25.09 " 4.799" 0.031" 0.000" 25
26 0.000" 0.000" 0.000" 0.000" 0.983" 87.41 " 207.1 " 43.23 " 22.96 " 4.175" 0.017" 0.000" 26
27 0.000" 0.000" 0.000" 0.000" 0.940" 66.25 " 190.1 " 40.37 " 21.28 " 3.847" 0.008" 0.000" 27
28 0.000" 0.000" 0.000" 0.000" 0.931" 56.13 " 132.5 " 41.31 " 20.06 " 3.699" 0.010" 0.000" 28
29 0.000" 0.000" 0.000" 0.928" 49.37 " 122.9 " 39.71 " 18.56 " 3.898" 0.017" 0.000" 29
30 0.000" 0.000" 0.000" 1.015" 44.01 " 100.5 " 35.39 " 17.65 " 4.822" 0.018" 0.000" 30
31 0.000" 0.000" 1.458" 87.31 " 32.72 " 4.458" 0.000" 31
Mean 0.000" 0.000" 0.000" 0.000" 0.365" 40.81 " 87.82 " 81.09 $ 39.38 " 10.24 " 0.724" 0.003"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 46.69 " 76.07 " 63.96 $ 35.59 " 8.072" 0.270" 0.000"
Maximum 0.004" 0.000" 0.000" 0.000" 1.630" 87.41 " 207.1 " 339.9 $ 89.60 " 26.24 " 3.751" 0.017"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 1.335" 36.90 " 32.72 $ 17.65 " 3.699" 0.008" 0.000"
Total 0.008" 0.000" 0.000" 0.000" 11.32 "1224 "2722 "2514 $1181 " 317.3 " 21.72 " 0.085"
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 21.90 $ " ... Relative Uncertainty +/-10%
Ann. Median 0.201$ $ ... Relative Uncertainty +/-20%
Annual Total 7992 $
Maximum Minimum
Daily 339.9 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2024
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 4.765" 349.5 $ 110.4 " 30.21 " 8.698" 0.776" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 8.147" 156.5 " 93.86 " 35.59 " 8.467" 0.724" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 8.592" 100.9 " 81.45 " 55.24 " 7.625" 0.778" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 7.288" 79.16 " 83.97 " 49.49 " 6.927" 0.959" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 6.597" 116.6 $ 105.5 " 40.69 " 6.800" 0.873" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 6.311" 360.4 $ 110.6 " 34.32 " 7.453" 0.485" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 7.551" 364.3 $ 95.46 " 29.61 " 6.534" 0.499" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 8.898" 148.1 " 83.17 " 26.79 " 6.071" 0.362" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 10.59 " 136.8 " 75.62 " 24.09 " 5.596" 0.244" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 11.55 " 122.7 " 68.91 " 20.42 " 5.130" 0.147" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 8.788" 208.3 " 61.41 " 18.84 " 4.690" 0.103" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 7.054" 269.9 $ 55.69 " 17.45 " 4.262" 0.074" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 6.212" 230.5 $ 51.01 " 16.13 " 3.897" 0.061" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 5.680" 520.1 $ 47.25 " 17.21 " 3.577" 0.054" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 5.271" 270.0 $ 43.67 " 19.49 " 3.247" 0.051" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 4.793" 175.3 " 39.77 " 19.62 " 2.927" 0.050" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 5.748" 392.5 $ 37.14 " 36.82 " 2.574" 0.053" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 33.02 " 837.8 $ 35.33 " 24.61 " 2.267" 0.051" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 25.88 " 381.0 $ 34.11 " 21.12 " 2.294" 0.037" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 18.78 " 252.4 $ 31.92 " 21.85 " 3.322" 0.024" 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 15.04 " 175.7 " 30.01 " 39.40 " 5.422" 0.015" 21
22 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 25.08 " 345.5 $ 29.38 " 29.21 " 4.687" 0.009" 22
23 0.000" 0.000" 0.000" 0.000" 0.000" 1.756" 28.73 " 600.1 $ 29.58 " 22.98 " 3.400" 0.004" 23
24 0.000" 0.000" 0.000" 0.000" 0.000" 3.805" 26.38 " 613.6 $ 28.48 " 19.45 " 2.620" 0.001" 24
25 0.000" 0.000" 0.000" 0.000" 0.000" 5.206" 35.85 " 382.5 $ 26.09 " 16.47 " 2.114" 0.001" 25
26 0.000" 0.000" 0.000" 0.000" 0.000" 5.804" 32.73 " 236.5 $ 24.72 " 14.55 " 1.701" 0.000" 26
27 0.000" 0.000" 0.000" 0.000" 0.000" 7.763" 27.38 " 206.6 " 27.72 " 13.02 " 1.454" 0.000" 27
28 0.000" 0.000" 0.000" 0.000" 0.000" 7.318" 169.6 $ 158.2 " 27.03 " 11.98 " 1.239" 0.000" 28
29 0.000" 0.000" 0.000" 0.000" 0.000" 5.973" 172.1 $ 174.8 " 24.27 " 11.08 " 1.026" 0.000" 29
30 0.000" 0.000" 0.000" 0.000" 5.006" 122.0 " 149.5 " 23.81 " 10.21 " 0.865" 0.000" 30
31 0.000" 0.000" 0.000" 169.3 $ 126.2 " 9.238" 0.000" 31
Mean 0.000" 0.000" 0.000" 0.000" 0.000" 1.421" 33.09 $ 278.8 $ 53.91 " 24.43 " 4.230" 0.208"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 10.59 $ 230.5 $ 41.72 " 21.12 " 3.737" 0.051"
Maximum 0.000" 0.000" 0.000" 0.000" 0.000" 7.763" 172.1 $ 837.8 $ 110.6 " 55.24 " 8.698" 0.959"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 4.765$ 79.16 $ 23.81 " 9.238" 0.865" 0.000"
Total 0.000" 0.000" 0.000" 0.000" 0.000" 42.63 "1026 $8642 $1617 " 757.2 " 126.9 " 6.436"
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 33.38 $ " ... Relative Uncertainty +/-10%
Ann. Median 0.007$ $ ... Relative Uncertainty +/-20%
Annual Total 12218 $
Maximum Minimum
Daily 837.8 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2025
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 68.21 " 157.9 " 102.0 " 49.47 " 25.10 " 4.212" 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 76.71 " 516.7 $ 93.94 " 45.87 " 20.79 " 3.503" 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 252.3 $ 439.6 $ 84.96 " 43.07 " 18.23 " 2.847" 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 25.66 " 137.7 " 303.3 $ 77.97 " 86.94 " 16.42 " 2.288" 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 23.57 " 95.96 " 242.8 " 382.5 $ 78.10 " 22.38 " 1.617" 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 11.83 " 127.5 " 180.7 " 661.1 $ 57.27 " 29.85 " 1.697" 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 8.511" 208.6 " 142.4 " 377.4 $ 50.44 " 23.30 " 1.561" 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 6.530" 150.0 " 123.4 " 307.8 $ 45.96 " 18.85 " 1.109" 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 5.162" 102.7 " 127.2 " 204.6 " 41.81 " 15.89 " 1.151" 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 10.07 " 83.59 " 154.4 " 158.2 " 38.70 " 13.96 " 0.978" 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 12.10 " 72.43 " 116.5 " 129.5 " 36.63 " 12.58 " 0.880" 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 8.652" 190.6 " 113.4 " 109.6 " 35.10 " 11.45 " 0.614" 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 9.555" 160.9 " 105.9 " 126.3 " 34.16 " 10.54 " 0.419" 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 10.33 " 215.8 " 148.5 " 274.1 $ 31.08 " 10.23 " 0.316" 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 13.45 " 165.9 " 108.6 " 232.2 $ 29.05 " 10.11 " 0.263" 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 11.97 " 168.1 " 91.10 " 160.7 " 29.09 " 9.353" 0.194" 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 10.71 " 117.3 " 85.02 " 383.0 $ 28.57 " 8.536" 0.157" 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 26.90 " 101.8 " 79.87 " 241.1 $ 29.50 " 7.663" 0.114" 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 29.84 " 92.83 " 280.5 $ 190.0 " 33.11 " 6.831" 0.084" 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 62.78 " 186.3 $ 280.0 $ 153.2 " 41.41 " 6.556" 0.059" 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 262.0 $ 293.7 $ 186.8 " 123.2 " 33.63 " 6.040" 0.039" 21
22 0.000" 0.000" 0.000" 0.000" 0.000" 217.5 $ 174.3 " 178.7 " 103.4 " 28.92 " 7.773" 0.033" 22
23 0.000" 0.000" 0.000" 0.000" 0.000" 118.9 " 325.6 $ 176.4 " 90.77 " 25.76 " 8.899" 0.026" 23
24 0.000" 0.000" 0.000" 0.000" 0.000" 81.94 " 456.5 $ 198.7 $ 80.39 " 33.68 " 9.953" 0.017" 24
25 0.000" 0.000" 0.000" 0.000" 0.000" 62.65 " 295.1 $ 359.6 $ 72.32 " 43.27 " 7.998" 0.010" 25
26 0.000" 0.000" 0.000" 0.000" 0.000" 97.76 " 198.7 " 342.7 $ 67.20 " 31.61 " 7.674" 0.006" 26
27 0.000" 0.000" 0.000" 0.000" 0.000" 119.6 " 983.1 $ 289.0 $ 61.34 " 26.06 " 8.378" 0.005" 27
28 0.000" 0.000" 0.000" 0.000" 0.000" 77.93 " 766.7 $ 302.6 $ 58.72 " 23.01 " 6.695" 0.006" 28
29 0.000" 0.000" 0.000" 0.000" 63.83 " 449.0 $ 188.9 " 55.85 " 21.26 " 5.737" 0.009" 29
30 0.000" 0.000" 0.000" 0.000" 62.08 " 269.4 $ 143.9 " 53.13 " 21.55 " 4.875" 0.005" 30
31 0.000" 0.000" 0.000" 195.3 " 117.0 " 22.53 " 0.002" 31
Mean 0.000" 0.000" 0.000" 0.000" 0.000" 48.39 $ 231.7 $ 202.6 $ 173.9 $ 37.95 " 12.42 " 0.781"
Median 0.000" 0.000" 0.000" 0.000" 0.000" 18.51 $ 174.3 $ 176.4 $ 124.8 $ 33.68 " 10.03 " 0.194"
Maximum 0.000" 0.000" 0.000" 0.000" 0.000" 262.0 $ 983.1 $ 516.7 $ 661.1 $ 86.94 " 29.85 " 4.212"
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 0.000$ 68.21 $ 79.87 $ 53.13 $ 21.26 " 4.875" 0.002"
Total 0.000" 0.000" 0.000" 0.000" 0.000"1452 $7182 $6282 $5217 $1177 " 372.7 " 24.22 "
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 59.47 $ " ... Relative Uncertainty +/-10%
Ann. Median 2.847$ $ ... Relative Uncertainty +/-20%
Annual Total 21706 $
Maximum Minimum
Daily 983.1 $ 0.000$
Department of Water and Environmental Regulation HYDAY V146 Output 14/08/2026
Site 609023 Chapman Brook - Forest Grove Year 2026
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 45.98 " 38.37 " [ ] [ ] [ ] [ ] 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 43.11 " 31.76 " [ ] [ ] [ ] [ ] 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 33.55 " 29.60 " [ ] [ ] [ ] [ ] 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 28.48 " 78.78 " [ ] [ ] [ ] [ ] 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 57.71 " 62.59 " [ ] [ ] [ ] [ ] 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 122.8 " 60.99 " [ ] [ ] [ ] [ ] 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 71.64 " 66.21 " [ ] [ ] [ ] [ ] 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 57.08 " 72.44 " [ ] [ ] [ ] [ ] 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 60.68 " 69.29 " [ ] [ ] [ ] [ ] 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 58.96 " 66.20 " [ ] [ ] [ ] [ ] 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 49.20 " 64.37 " [ ] [ ] [ ] [ ] 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 43.37 " 55.08 " [ ] [ ] [ ] [ ] 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 39.39 " [ ] [ ] [ ] [ ] [ ] 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 0.850" 36.47 " [ ] [ ] [ ] [ ] [ ] 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 4.841" 32.63 " [ ] [ ] [ ] [ ] [ ] 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 9.778" 51.39 " [ ] [ ] [ ] [ ] [ ] 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 8.081" 64.95 " [ ] [ ] [ ] [ ] [ ] 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 7.434" 62.06 " [ ] [ ] [ ] [ ] [ ] 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 6.521" 59.62 " [ ] [ ] [ ] [ ] [ ] 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 5.715" 58.61 " [ ] [ ] [ ] [ ] [ ] 20
21 0.000" 0.000" 0.000" 0.000" 0.000" 6.604" 60.06 " [ ] [ ] [ ] [ ] [ ] 21
22 0.000" 0.000" 0.000" 0.000" 0.000" 7.077" 53.83 " [ ] [ ] [ ] [ ] [ ] 22
23 0.000" 0.000" 0.000" 0.000" 0.000" 5.781" 45.53 " [ ] [ ] [ ] [ ] [ ] 23
24 0.000" 0.000" 0.000" 0.000" 0.000" 4.970" 40.89 " [ ] [ ] [ ] [ ] [ ] 24
25 0.000" 0.000" 0.000" 0.000" 0.000" 4.632" 37.47 " [ ] [ ] [ ] [ ] [ ] 25
26 0.000" 0.000" 0.000" 0.000" 0.000" 13.40 " 38.89 " [ ] [ ] [ ] [ ] [ ] 26
27 0.000" 0.000" 0.000" 0.000" 0.000" 35.42 " 37.89 " [ ] [ ] [ ] [ ] [ ] 27
28 0.000" 0.000" 0.000" 0.000" 0.000" 50.72 " 33.64 " [ ] [ ] [ ] [ ] [ ] 28
29 0.000" 0.000" 0.000" 0.000" 38.72 " 30.77 " [ ] [ ] [ ] [ ] [ ] 29
30 0.000" 0.000" 0.000" 0.000" 51.61 " 28.57 " [ ] [ ] [ ] [ ] [ ] 30
31 0.000" 0.000" 0.000" 29.01 " [ ] [ ] [ ] 31
Mean 0.000" 0.000" 0.000" 0.000" 0.000" 8.739" 48.85 " 57.97 " [ ] [ ] [ ] [ ]
Median 0.000" 0.000" 0.000" 0.000" 0.000" 4.737" 45.53 " 63.48 " [ ] [ ] [ ] [ ]
Maximum 0.000" 0.000" 0.000" 0.000" 0.000" 51.61 " 122.8 " 78.78 " [ ] [ ] [ ] [ ]
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 0.000" 28.48 " 29.60 " [ ] [ ] [ ] [ ]
Total 0.000" 0.000" 0.000" 0.000" 0.000" 262.2 "1514 " 695.7 " [ ] [ ] [ ] [ ]
Missing Days 0 0 0 0 0 0 0 19 30 31 30 31
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 11.04 " " ... Relative Uncertainty +/-10%
Ann. Median 0.000" [ ... Not Available
Annual Total 2472 "
Missing Days 141
Maximum Minimum
Daily 122.8 " 0.000"