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 HYMONTH V128 Output 14/11/2025
Site 609022 Chapman Brook - White Elephant Site 609022
VarFrom 10.00 Stage - SL in Metres
VarTo 151.00 Total Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Mean Annual Missing
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Monthly Total Days Yr
1995 [ ] [ ] [ ] [ ] [298.7] 5388 &18968 &13485 " 6799 & 3143 & 1698 & 752.7& [6316 ] [50531] 146 1995
1996 176.1& 115.6& 101.8& 82.3& 6.3$ 2665 $24259 &21368 &16752 "14522 " 6761 " 1218 # 7336 & 88028& 0 1996
1997 92.2$ 9.0$ 26.1$ 0.5$ 413.2$ 6907 " 7532 "14739 &11389 " 3099 " 1067 # 238.4$ 3793 & 45512& 0 1997
1998 8.7$ 0.0$ 105.4$ 209.3# 691.2# 8749 # 7893 &17271 &14923 " 6226 " 1488 # 251.1$ 4818 & 57815& 0 1998
1999 68.3$ 0.0$ 0.0$ 0.0$ 1501 $16070 &17640 &15399 "12157 " 9750 " 1843 # 325.8$ 6230 & 74754& 0 1999
2000 78.3$ 16.0$ 34.0$ 113.2$ 309.5# 5070 #22841 &14448 "10526 " 2814 " 827.0# 122.9$ 4767 & 57200& 0 2000
2001 3.2$ 0.0$ 0.0$ 0.0$ 218.2$ 1167 # 2035 " 3985 " 3493 " 2767 " 531.9# 324.8$ 1210 $ 14525$ 0 2001
2002 7.7$ 0.0$ 0.0$ 78.2$ 1112 # 2043 # 6179 " 8863 " 5572 " 2576 " 1180 # 114.0$ 2310 $ 27725$ 0 2002
2003 1.6$ 0.0$ 0.0$ 0.0$ 114.5$ 2742 &11030 & 9032 " 8040 " 3969 " 1212 # 184.8$ 3027 & 36326& 0 2003
2004 3.9$ 0.0$ 0.0$ 0.0$ 232.5$ 4652 # 6329 "11753 " 4938 " 2154 " 757.7# 123.9$ 2579 $ 30944$ 0 2004
2005 0.1$ 0.0$ 0.0$ 12.2$ 2147 $ 7199 " 6393 " 8685 " 7180 " 6144 " 2347 " 684.0# 3399 $ 40792$ 0 2005
2006 105.1$ 11.0$ 0.0$ 9.4$ 67.2$ 283.8$ 1952 # 6211 " 3503 " 1655 # 507.3# 179.0$ 1207 $ 14484$ 0 2006
2007 26.1$ 0.0$ 0.0$ 0.0$ 144.7$ 410.6# 5240 "10076 "10009 " 3689 " 872.9# 254.2$ 2560 $ 30722$ 0 2007
2008 10.0$ 0.0$ 0.0$ 8.4$ 1621 # 5959 "14082 " 9065 " 2898 " 2166 " 1612 " 389.0$ 3151 $ 37811$ 0 2008
2009 13.9$ 0.0$ 2.6$ 0.0$ 25.4$ 5536 #19488 &11494 "13628 " 4769 " 1422 # 197.5$ 4715 & 56577& 0 2009
2010 3.2$ 0.0$ 0.0$ 0.0$ 185.6$ 934.0# 5360 " 6483 " 2515 " 769.4# 207.9$ 21.7$ 1373 $ 16479$ 0 2010
2011 0.1$ 0.0$ 0.0$ 0.0$ 29.6$ 803.4# 6692 "10220 " 5472 " 2839 " 833.9# 76.0$ 2247 $ 26965$ 0 2011
2012 0.5$ 0.0$ 0.0$ 0.0$ 32.2$ 5579 " 3710 " 5617 " 5288 " 2127 " 630.5# 185.3$ 1931 $ 23169$ 0 2012
2013 0.9$ 0.0$ 0.0$ 0.0$ 709.2$ 4980 "14196 &14843 &18973 & 5080 " 909.6# 207.6$ 4992 & 59899& 0 2013
2014 0.9$ 0.0$ 0.0$ 0.0$ 42.5$ 2863 #11217 " 7360 " 7981 " 3101 " 1025 # 289.9$ 2823 $ 33880$ 0 2014
2015 15.0$ 0.0$ 0.0$ 0.4$ 683.1$ 1421 # 3470 " 4817 " 3351 " 1167 # 392.2# 83.1$ 1283 $ 15399$ 0 2015
2016 112.0$ 24.5$ 0.0$ 0.0$ 445.6$ 4437 #12948 "12583 " 7202 " 4981 # 1242 # 243.1$ 3685 $ 44218$ 0 2016
2017 11.8$ 0.0$ 0.0$ 0.1$ 110.2$ 398.5# 5416 #13722 " 5145 # 3532 # 715.4# 373.5$ 2452 $ 29425$ 0 2017
2018 23.3$ 0.0$ 0.0$ 9.4$ 304.5$ 4323 #12259 "13217 & 7827 # 3264 # 1169 # 459.0$ 3571 & 42857& 0 2018
2019 22.0$ 2.3$ 0.0$ 12.5$ 100.8$ 3751 $ 7094 # 5345 # 5929 # 2922 # 1032 # 113.9$ 2194 $ 26325$ 0 2019
2020 1.7$ 0.0$ 0.0$ 0.0$ 225.5$ 1796 # 9604 #10896 " 8341 " 3266 # 1823 # 401.9$ 3030 $ 36355$ 0 2020
2021 9.3$ 0.0$ 32.6$ 85.2$ 703.6# 6013 #14470 "16439 " 7396 " 6942 # 2320 # 442.0# 4571 $ 54853$ 0 2021
2022 23.0$ 0.0$ 0.0$ 0.3$ [365.7] 3261 # 7602 #14219 " 5060 # 2738 # 1458 # 285.7$ [2918 ] [35014] 1 2022
2023 17.4$ 0.0$ 0.0$ 0.0$ 94.6$ 3952 # 8238 # 8846 # 4480 # 1427 # 193.2$ 0.4$ 2271 $ 27249$ 0 2023
2024 0.0$ 0.0$ 0.0$ 0.0$ 0.0$ 137.9$ 3527 $20048 & 6339 # 2953 # 823.0# 107.2$ 2828 & 33935& 0 2024
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
" ... Relative Uncertainty +/-10%
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
[ ... Not Available
Department of Water and Environmental Regulation HYMONTH V128 Output 14/11/2025
Site 609022 Chapman Brook - White Elephant Site 609022
VarFrom 10.00 Stage - SL in Metres
VarTo 151.00 Total Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Mean Annual Missing
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Monthly Total Days Yr
2025 0.0$ 0.0$ 0.0$ 0.0$ 0.0$ 4398 $16886 &17829 "13716 " 4278 # [963.2] [ ] [5279 ][58070 ] 49 2025
Mean 27.9& 5.9& 10.1& 20.7& [417.3] 3997 &10147 &11560 & 7962 & 3898 &[1286 ] 288.3& [3383 ][39608 ] Mean
Med. 9.7& 0.0& 0.0& 0.0& [225.5] 3952 & 7893 &11494 & 7180 & 3101 &[1032 ] 240.7& Med.
Max 176.1& 115.6& 105.4& 209.3&[2147 ]16070 &24259 &21368 &18973 &14522 &[6761 ] 1218 & [7336 ][88028 ] Max
Min 0.0& 0.0& 0.0& 0.0& [0.0] 137.9& 1952 & 3985 & 2515 & 769.4& [193.2] 0.4& [1207 ][14484 ] Min
Total 836& 178& 303& 621& [12935] 123892& 314549& 358358& 246822& 120828& [39866] 8650& [104865][1227838] 196 Total
OK 100% 100% 100% 100% 97% 100% 100% 100% 100% 100% 98% 100% 100% 100% OK
Cnt 30 30 30 30 31 31 31 31 31 31 31 30 31 31 Cnt
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
" ... Relative Uncertainty +/-10%
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
[ ... Not Available