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Department of Water and Environmental Regulation HYMONTH V128 Output 09/08/2026
Site 802156 Margaret River - Margaret Gorge Site 802156
VarFrom 10.00 Stage - SL in Metres
VarTo 140.00 Mean Stream Discharge in Cubic Metres/Second
Figures are for period ending 24:00
Mean Median Missing
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Monthly Monthly Days Yr
1997 [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [0.000] 0.000& 37.18 & [12.39 ] [0.000] 279 1997
1998 37.89 & 53.52 & 2.470& 6.332& 0.141& 0.000& 0.000& 0.000& 0.000& 0.000& 25.20 &171.7 & 24.77 & 1.305& 0 1998
1999 243.9 $211.8 $ 27.95 & 5.710& 1.026& 0.630& 0.436& 0.312& 0.231& 0.473& 23.67 & 61.49 & 48.14 & 3.368& 0 1999
2000 172.0 $234.5 $[1290 ][57.44 ] 12.85 # 4.010# 1.733# 0.990$ 0.733$ 0.576$ 0.496$ 8.298$ [148.7 ] [6.154] 45 2000
2001 7.912#585.3 $431.0 $ 24.69 # 5.484# 3.242# 2.156# 1.351$ 0.699$ 0.306$ 0.653$ 10.46 $ 89.43 $ 4.363$ 0 2001
2002 23.07 #433.4 $ 48.72 # 1.739$ 0.636$ 0.333$ 0.104$ 0.006& 0.000& 0.000& 4.756& 9.238# 43.50 & 1.188& 0 2002
2003 55.90 #219.2 $ 38.55 # 5.476# 1.161$ 0.011& 0.000& 0.000& 0.000& 0.000& 0.000& 7.021& 27.28 & 0.586& 0 2003
2004 71.04 $302.2 $ 53.88 # 10.73 # 16.77 # 4.300$ 0.118& 0.000& 0.000& 0.000& 0.000& 0.000& 38.25 & 2.209& 0 2004
2005 8.895& 36.58 $ 14.91 $ 0.528& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 34.72 & 7.969& 0.000& 0 2005
2006 225.4 $ 81.58 # 94.72 # 6.475# 0.824$ 0.009& 0.000& 0.000& 0.000& 0.000& 2.257& 12.63 # 35.32 & 1.541& 0 2006
2007 165.3 $ 2.316$125.9 $ 23.29 # 0.871$ 0.111$ 0.001& 0.000& 0.000& 0.000& 5.217& 23.98 & 28.92 & 1.593& 0 2007
2008 38.35 #271.8 $ 17.21 # 2.358$ 0.021& 0.000& 0.000& 0.000& 0.000& 0.000& 6.843& 38.94 $ 31.30 & 1.189& 0 2008
2009 231.1 $120.5 # 44.25 # 0.646& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 10.27 & 33.90 & 0.000& 0 2009
2010 91.04 $ 39.18 # 27.33 # 8.270$ 0.648$ 0.246& 0.166$ 0.002& 0.091& 6.416& 3.826# 10.29 # 15.63 & 5.121& 0 2010
2011 95.01 #215.7 $938.6 $146.9 # 21.02 # 1.189$ 0.008& 0.000& 0.000& 0.000& 35.70 & 51.05 # 125.4 & 28.36 & 0 2011
2012 64.45 # 61.26 #154.1 # 27.39 # 11.08 # 8.566# 5.670# 3.338# 1.956# 0.994$ 3.682$ 52.73 # 32.94 $ 9.822$ 0 2012
2013 44.64 # 52.68 # 89.97 # 11.87 # 13.83 # 9.667# 5.561# 2.105$ 0.742$ 0.136& 17.22 & 53.20 # 25.13 & 12.85 & 0 2013
2014 268.9 $237.3 $ 30.70 # 13.57 # 9.065# 4.605# 1.610$ 0.226& 0.000& 0.000& 0.000& 37.48 & 50.28 & 6.835& 0 2014
2015 144.8 # 54.77 # 83.41 $ 3.070$ 0.917$ 0.071& 0.000& 0.000& 0.000& 0.000& 6.535& 52.68 $ 28.86 & 1.993& 0 2015
2016 65.65 $ 32.74 $ 42.31 $ 5.805$ 6.467$ 1.171$ 0.009& 0.000& 0.000& 0.000& 0.000& 38.13 & 16.02 & 3.488& 0 2016
2017 355.1 $327.0 $254.1 $ 12.68 # 3.359# 1.148$ 0.338$ 0.038& 0.000& 0.000& 0.000& 0.250& 79.50 & 0.743& 0 2017
2018 89.35 & 95.84 # 29.28 # 0.578& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 17.92 & 0.000& 0 2018
2019 65.90 & 11.56 $ 6.655# 1.220$ 0.044& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 7.115& 0.000& 0 2019
2020 39.02 &175.6 $225.6 $ 0.100& 0.396& 0.115& 0.000& 0.000& 0.000& 0.000& 0.000&208.0 & 54.07 & 0.108& 0 2020
2021 88.81 #283.2 $118.2 $ 5.902$ 0.064& 0.000& 0.000& 0.000& 0.000& 0.000& 9.114& 0.786& 42.18 & 0.425& 0 2021
2022 214.2 $118.3 $ 1.096$ 0.190& 0.000& 0.000& 0.000& 0.000& 0.000& 3.233&233.4 & 89.76 $ 55.02 & 0.643& 0 2022
2023 619.2 $ 94.40 # 9.320# 26.24 # 2.183$ 0.572$ [0.319] [ ]N [ ]N [ ]N [ ]N [ ]N [107.5 ] [9.320] 183 2023
2024 [530.5 ]114.6 $143.5 $[18.22 ] [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N[20.85 ] [165.5 ][114.6 ] 274 2024
2025 [48.17 ][51.56 ][17.79 ] [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N[59.18 ] [44.17 ] [49.86 ] 332 2025
2026 [38.66 ][439.7 ]242.8 $ [9.646] [ ]N [ ]N [ ]N [ ] [ ] [ ] [ ] [ ] [182.7 ][140.8 ] 296 2026
1409 Total
Mean [142.9 ][171.0 ][158.8 ][15.61 ] 4.187& 1.538& [0.701] 0.335& 0.178& [0.467] 14.56 &[39.29 ] [53.99 ] Mean
Med. [88.81 ][118.3 ][48.72 ] [6.403] 0.894& 0.181& [0.004] 0.000& 0.000& [0.000] 1.455&[29.35 ] [2.316] Med.
Max [619.2 ][585.3 ][1290 ][146.9 ] 21.02 & 9.667& [5.670] 3.338& 1.956& [6.416]233.4 &[208.0 ] [182.7 ] Max
Min [7.912] [2.316] [1.096] [0.100] 0.000& 0.000& [0.000] 0.000& 0.000& [0.000] 0.000& [0.000] [7.115] Min
OK 94% 98% 95% 91% 100% 100% 96% 100% 100% 99% 100% 94% 97% OK
Cnt 29 29 29 28 26 26 26 25 25 26 26 28 30 Cnt
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
N ... Not Rated
[ ... Not Available
Department of Water and Environmental Regulation HYMONTH V128 Output 09/08/2026
Site 802156 Margaret River - Margaret Gorge Site 802156
VarFrom 10.00 Stage - SL in Metres
VarTo 140.00 Maximum Stream Discharge in Cubic Metres/Second
Figures are for period ending 24:00
Annual Missing
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Max Days Yr
1997 [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [0.00] 0.00& 276.5 & [276.5 ] 279 1997
1998 261.9 & 515.0 & 17.95& 118.5 & 0.97& 0.00& 0.00& 0.00& 0.00& 0.00& 310.9 &2122 & 2122 & 0 1998
1999 1766 $ 930.2 $ 100.7 & 30.63& 1.56& 0.76& 0.53& 0.37& 0.27& 49.68& 231.0 & 331.8 & 1766 & 0 1999
2000 2240 $2551 $[4452 ] [68.16] 44.84# 5.91# 2.45# 1.26$ 0.82$ 0.65$ 0.51$ 87.54$ [4452 ] 45 2000
2001 215.6 #4054 $3824 $ 67.63# 9.02# 3.98# 2.87# 1.81$ 0.97$ 0.48$ 5.05$ 50.12$ 4054 $ 0 2001
2002 189.8 #4721 $ 707.3 # 2.98$ 0.94$ 0.48$ 0.20$ 0.03& 0.00& 0.00& 141.5 & 67.33# 4721 & 0 2002
2003 722.2 #2292 $ 672.6 # 10.86# 3.64$ 0.10& 0.00& 0.00& 0.00& 0.00& 0.00& 52.96& 2292 & 0 2003
2004 845.1 $1505 $ 358.5 # 27.99# 125.8 # 12.73$ 0.59& 0.00& 0.00& 0.00& 0.00& 0.00& 1505 & 0 2004
2005 138.0 & 918.9 $ 260.9 $ 4.38& 0.00& 0.00& 0.00& 0.00& 0.00& 0.00& 0.00& 433.3 & 918.9 & 0 2005
2006 2515 $ 862.1 # 878.0 # 20.62# 2.30$ 0.07& 0.00& 0.00& 0.00& 0.00& 8.32& 139.8 # 2515 & 0 2006
2007 2237 $ 8.04$1578 $ 282.6 # 2.06$ 0.28$ 0.01& 0.00& 0.00& 0.00& 108.5 & 382.0 & 2237 & 0 2007
2008 382.2 #1411 $ 44.28# 14.77$ 0.14& 0.00& 0.00& 0.00& 0.00& 0.00& 71.00& 653.0 $ 1411 & 0 2008
2009 1627 $ 721.4 # 659.6 # 3.70& 0.00& 0.00& 0.00& 0.00& 0.00& 0.00& 0.00& 134.4 & 1627 & 0 2009
2010 1057 $ 179.2 # 358.3 # 59.08$ 1.54$ 0.91& 0.80$ 0.02& 0.68& 77.30& 12.91# 122.0 # 1057 & 0 2010
2011 891.3 #1171 $4786 $ 913.0 # 47.15# 4.00$ 0.07& 0.00& 0.00& 0.00& 185.5 & 173.1 # 4786 & 0 2011
2012 239.5 # 292.8 # 742.8 # 69.53# 12.87# 9.79# 7.25# 4.32# 2.59# 1.63$ 39.62$ 764.1 # 764.1 $ 0 2012
2013 457.2 # 469.1 # 731.7 # 18.58# 57.02# 13.29# 7.93# 3.34$ 1.24$ 0.38& 193.8 & 425.3 # 731.7 & 0 2013
2014 3256 $1153 $ 66.17# 33.26# 13.24# 6.76# 3.77$ 0.66& 0.01& 0.00& 0.00& 190.9 & 3256 & 0 2014
2015 970.9 # 348.2 # 929.9 $ 5.73$ 1.68$ 0.30& 0.00& 0.00& 0.00& 0.00& 44.60& 793.9 $ 970.9 & 0 2015
2016 413.2 $ 145.2 $ 238.2 $ 13.34$ 27.38$ 2.85$ 0.10& 0.00& 0.00& 0.00& 0.00& 221.7 & 413.2 & 0 2016
2017 2711 $2092 $3586 $ 53.64# 5.48# 1.83$ 0.70$ 0.11& 0.00& 0.00& 0.00& 6.13& 3586 & 0 2017
2018 2395 & 551.0 # 361.6 # 3.88& 0.00& 0.00& 0.00& 0.00& 0.00& 0.00& 0.00& 0.00& 2395 & 0 2018
2019 927.4 & 231.6 $ 102.3 # 3.10$ 0.25& 0.00& 0.00& 0.00& 0.00& 0.00& 0.00& 0.00& 927.4 & 0 2019
2020 310.3 &1295 $3929 $ 2.07& 8.15& 2.24& 0.00& 0.00& 0.00& 0.00& 0.00&1488 & 3929 & 0 2020
2021 610.2 #3074 $1375 $ 25.49$ 0.53& 0.00& 0.00& 0.00& 0.00& 0.00& 92.89& 37.25& 3074 & 0 2021
2022 2829 $2807 $ 7.93$ 1.16& 0.00& 0.00& 0.00& 0.00& 0.00& 35.40&2435 &1463 $ 2829 & 0 2022
2023 5885 $ 953.5 # 49.17# 483.4 # 4.13$ 0.94$ [0.44] [ ]N [ ]N [ ]N [ ]N [ ]N [5885 ] 183 2023
2024 [2613 ]2101 $1472 $ [45.41] [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [64.73] [2613 ] 274 2024
2025 [643.5 ][757.4 ] [26.66] [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N[120.1 ] [757.4 ] 332 2025
2026 [258.0 ][1808 ]2503 $ [11.86] [ ]N [ ]N [ ]N [ ] [ ] [ ] [ ] [ ] [2503 ] 296 2026
1409 Total
Mean [1366 ][1377 ][1201 ][85.55 ] 14.26 & 2.586& [1.066] 0.477& 0.263& [6.366]149.3 &[378.6 ] [2346 ] Mean
Med. [891.3 ][953.5 ][672.6 ][23.06 ] 2.179& 0.620& [0.039] 0.000& 0.000& [0.000] 6.686&[156.5 ] Med.
Max [5885 ][4721 ][4786 ][913.0 ] 125.8 & 13.29& [7.93] 4.32& 2.59& [77.30]2435 &[2122 ] [5885 ] Max
Min [138.0 ] [8.04] [7.93] [1.16] 0.00& 0.00& [0.00] 0.00& 0.00& [0.00] 0.00& [0.00] [276.5 ] Min
OK 94% 98% 95% 91% 100% 100% 96% 100% 100% 99% 100% 94% 97% OK
Cnt 29 29 29 28 26 26 26 25 25 26 26 28 30 Cnt
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
N ... Not Rated
[ ... Not Available
Department of Water and Environmental Regulation HYMONTH V128 Output 09/08/2026
Site 802156 Margaret River - Margaret Gorge Site 802156
VarFrom 10.00 Stage - SL in Metres
VarTo 140.00 Minimum Stream Discharge in Cubic Metres/Second
Figures are for period ending 24:00
Annual Missing
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Min Days Yr
1997 [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [0.000] 0.000& 0.000& [0.000] 279 1997
1998 0.755& 1.976& 0.455& 0.036& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 10.32 & 0.000& 0 1998
1999 30.80 $ 47.12 $ 4.041& 1.560& 0.763& 0.526& 0.370& 0.270& 0.188& 0.100& 0.222& 3.125& 0.100& 0 1999
2000 30.37 $ 18.32 $[144.7 ][41.91 ] 5.910# 2.450# 1.261# 0.822$ 0.651$ 0.510$ 0.490$ 0.445$ [0.445] 45 2000
2001 1.687# 2.618$ 48.07 $ 8.095# 3.985# 2.310# 1.814# 0.971$ 0.475$ 0.155$ 0.132$ 0.830$ 0.132$ 0 2001
2002 6.057# 11.55 $ 2.985# 0.938$ 0.476$ 0.201$ 0.028$ 0.000& 0.000& 0.000& 0.000& 2.943# 0.000& 0 2002
2003 2.464# 1.810$ 5.212# 3.645# 0.100$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2003
2004 4.638$ 26.96 $ 14.92 # 4.547# 4.058# 0.594$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2004
2005 0.000& 0.644$ 0.460$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2005
2006 10.93 $ 14.82 # 3.340# 2.299# 0.070$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 1.291# 0.000& 0 2006
2007 4.440$ 0.154$ 0.026$ 2.059# 0.282$ 0.011$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2007
2008 2.561# 22.76 $ 6.057# 0.136$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.958$ 0.000& 0 2008
2009 3.525$ 22.81 # 3.697# 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2009
2010 2.958$ 10.95 # 2.249# 0.927$ 0.088$ 0.003& 0.008$ 0.000& 0.000& 0.000& 2.237# 1.753# 0.000& 0 2010
2011 3.715# 23.58 $ 53.90 $ 47.15 # 3.996# 0.068$ 0.000& 0.000& 0.000& 0.000& 0.000& 25.32 # 0.000& 0 2011
2012 39.69 # 21.91 # 69.53 # 11.95 # 9.666# 7.175# 4.208# 2.547# 1.416# 0.596$ 0.539$ 2.122# 0.539$ 0 2012
2013 12.77 # 13.97 # 16.33 # 8.845# 8.293# 7.845# 3.340# 1.236$ 0.384$ 0.004& 0.000& 15.91 # 0.000& 0 2013
2014 8.816$ 60.62 $ 10.66 # 10.24 # 6.689# 2.807# 0.663$ 0.005& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2014
2015 15.23 # 18.29 # 5.732$ 1.654$ 0.300$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.688$ 0.000& 0 2015
2016 7.845$ 8.293$ 10.70 $ 3.098$ 2.733$ 0.093$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2016
2017 20.74 $ 57.55 $ 33.81 $ 5.462# 1.821# 0.695$ 0.111$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2017
2018 0.000& 14.41 # 1.986# 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2018
2019 0.000& 0.393$ 2.943# 0.254$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2019
2020 0.000& 5.050$ 0.048$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2020
2021 2.263# 23.41 $ 9.982$ 0.528$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0 2021
2022 0.300$ 2.084$ 0.275$ 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 0.000& 1.037$ 0.000& 0 2022
2023 15.85 $ 11.27 # 1.998# 1.776# 0.942$ 0.332$ [0.314] [ ]N [ ]N [ ]N [ ]N [ ]N [0.314] 183 2023
2024 [24.92 ] 7.737$ 26.84 $ [7.493] [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [8.965] [7.493] 274 2024
2025 [8.041] [7.601] [9.730] [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N [ ]N[35.12 ] [7.601] 332 2025
2026 [9.085][14.61 ] 11.73 $ [7.957] [ ]N [ ]N [ ]N [ ] [ ] [ ] [ ] [ ] [7.957] 296 2026
1409 Total
Mean [9.326][16.32 ][17.33 ] [6.163] 1.930& 0.966& [0.466] 0.234& 0.125& [0.053] 0.139& [3.958] [0.819] Mean
Med. [4.638][13.97 ] [5.732] [1.917] 0.291& 0.007& [0.000] 0.000& 0.000& [0.000] 0.000& [0.567] Med.
Max [39.69 ][60.62 ][144.7 ][47.15 ] 9.666& 7.845& [4.208] 2.547& 1.416& [0.596] 2.237&[35.12 ] [7.957] Max
Min [0.000] [0.154] [0.026] [0.000] 0.000& 0.000& [0.000] 0.000& 0.000& [0.000] 0.000& [0.000] [0.000] Min
OK 94% 98% 95% 91% 100% 100% 96% 100% 100% 99% 100% 94% 97% OK
Cnt 29 29 29 28 26 26 26 25 25 26 26 28 30 Cnt
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
N ... Not Rated
[ ... Not Available