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Department of Water and Environmental Regulation HYMONTH V128 Output 13/11/2025
Site 615062 Avon River - Northam Weir Site 615062
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
1977 0.000# 0.000# 0.000# 0.000 0.000 0.392& 0.748& 4.770$ 0.626& 0.478& 0.718& 0.000 0.644& 0.196& 0 1977
1978 0.000 0.104& 0.031& 0.000 0.662& 2.205$ 46.58 " 9.922" 3.834" 1.250& 0.014& 0.000 5.383& 0.383& 0 1978
1979 0.051& 0.000 0.000 0.000 0.556& 5.150# 5.854" 9.166! 1.780! 0.113! 0.000! 0.000 1.889! 0.082! 0 1979
1980 0.000 0.000 0.000 0.000 0.148& 1.359& 3.244" 1.900" 0.536& 0.895& 0.114& 0.000 0.683& 0.131& 0 1980
1981 0.000 0.000 0.008& 0.000 4.560& 33.23 " 22.20 " 35.23 ! 4.684" 0.704& 1.266& 0.026& 8.492! 0.985! 0 1981
1982 3.392! 0.194& 0.000 0.000 0.072& 1.998& 3.162# 6.240" 2.799# 0.915& 0.480& 0.152& 1.617! 0.697! 0 1982
1983 0.000 0.000 0.013& 0.009& 0.000! 21.09 ! 85.56 " 41.88 " 38.81 " 1.907& 1.822& 0.174& 15.94 ! 0.998! 0 1983
1984 0.270& 0.000 0.000 0.173& 7.940# 6.480" 7.679" 8.379" 9.846" 1.087& 0.303& 0.000& 3.513& 0.695& 0 1984
1985 0.000 0.000 0.000 0.000 0.000 0.282& 4.872# 7.869" 2.576" 0.390& 0.059& 0.003& 1.338& 0.031& 0 1985
1986 0.000 1.660! 0.313& 0.002& 0.798! 12.69 $ 13.39 " 20.90 " 4.420" 0.905& 0.208& 0.001& 4.608! 0.852! 0 1986
1987 0.000 0.000 0.000 0.000 1.186& 1.929& 5.598" 9.044" 2.210# 0.466& 0.034& 0.013& 1.707& 0.250& 0 1987
1988 0.000& 0.000 0.000 0.000 0.788& 7.919! 15.87 " 13.38 " 4.166" 3.074! 0.110& 0.634& 3.828! 0.711! 0 1988
1989 0.000 0.000 0.000 0.000 1.096& 5.397" 26.54 " 6.617! 1.210! 0.594& 0.092& 0.000& 3.463! 0.343! 0 1989
1990 8.578& 24.52 " 3.654$ 1.817& 2.061" 2.201# 10.99 # 8.419" 2.174" 0.827& 0.110& 0.000 5.446& 2.188& 0 1990
1991 0.000 0.000 0.000 0.000 0.000 3.044& 13.91 " 17.15 " 4.242# 0.398& 0.124& 0.028& 3.241& 0.076& 0 1991
1992 0.001& 0.000& 0.000 1.012& 0.291& 5.562& 14.67 " 27.03 " 35.32 " 8.070# 0.797& 0.127& 7.739& 0.905& 0 1992
1993 0.000 0.025& 0.658& 0.339& 1.002& 3.018# 6.306" 10.51 " 6.704" 1.096& 0.521& 0.015& 2.516& 0.830& 0 1993
1994 0.000 0.000 0.000 0.000 0.954& 5.829" 10.03 " 7.652" 2.163& 0.223& 0.007& 0.000 2.238& 0.115& 0 1994
1995 0.000 0.000 0.000 0.000 0.672& 5.441& 28.00 " 13.36 " 5.049" 4.559& 0.277& 0.002& 4.780& 0.475& 0 1995
1996 0.000 0.000 0.000 0.000 0.000 8.986& 55.57 " 41.91 " 8.873" 2.647# 2.086& 0.058& 10.01 & 1.072& 0 1996
1997 0.000 0.000 0.698& 2.560$ 0.749& 2.358# 3.006# 7.958" 7.374" 1.177& 0.094& 0.000& 2.164& 0.963& 0 1997
1998 0.000 0.000 0.000 0.000! 0.000! 3.952! 6.021" 9.289" 15.83 " 1.376& 0.055& 0.000& 3.044! 0.027! 0 1998
1999 0.211& 0.000& 0.000 0.000 1.749& 10.59 " 24.67 " 18.29 " 14.55 " 7.141" 0.850& 0.182& 6.520& 1.299& 0 1999
2000 40.71 & 42.08 " 5.298$ 0.477& 0.629& 2.232& 14.49 " 8.579" 7.337" 0.623& 0.079& 0.000 10.21 & 3.765& 0 2000
2001 0.000 0.000 0.000 0.000 0.000 0.260& 0.981& 8.067" 1.539$ 0.677& 0.053& 0.002& 0.965& 0.027& 0 2001
2002 0.000 0.000 0.000 0.000 0.049& 0.654& 2.485# 1.891# 1.342& 0.260& 0.021& 0.000 0.559& 0.035& 0 2002
2003 0.000 0.000 0.000 0.484& 0.697& 1.922& 10.03 " 12.34 " 3.730" 0.690& 0.036& 0.000 2.494& 0.587& 0 2003
2004 0.000 0.000 0.000 0.000 0.000 1.182& 2.341# 4.709" 2.446$ 0.320& 0.027& 0.000 0.919& 0.013& 0 2004
2005 0.000 0.000 0.000 0.950& 7.192& 19.90 " 8.091" 7.243" 4.878" 1.420& 0.089& 0.000 4.147& 1.185& 0 2005
2006 6.767& 1.383& 0.022& 0.047& 0.154& 0.272& 0.836& 3.280# 2.952# 0.356& 0.035& 0.000 1.342& 0.314& 0 2006
2007 0.000 0.000 0.000 0.000 0.000 0.698& 5.504# 9.921" 4.107" 0.780& 0.021& 0.000 1.753& 0.011& 0 2007
2008 0.000 0.000 0.000 0.589& 0.367& 1.177$ 10.85 " 13.58 " 2.161# 1.886$ 0.612& 0.113& 2.612& 0.600& 0 2008
2009 1.234& 0.315& 0.116& 0.000 0.000 0.683& 14.00 " 12.29 " 5.889" 0.960& 0.169& 0.003& 2.972& 0.499& 0 2009
2010 0.000 0.000 0.999& 0.187& 0.190& 0.470& 1.660& 0.850$ 0.222& 0.013& 0.000 0.000 0.383& 0.188& 0 2010
2011 0.000 0.000 0.000 0.000# 0.000 0.173& 4.318# 11.35 " 2.700" 1.503$ 1.356& 0.526& 1.827& 0.350& 0 2011
50 Total
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
! ... Not reviewed / Quality not known
" ... Relative Uncertainty +/-10%
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
[ ... Not Available Department of Water and Environmental Regulation HYMONTH V128 Output 13/11/2025
Site 615062 Avon River - Northam Weir Site 615062
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
2012 0.221& 0.013& 0.000 0.000 0.000 1.414& 0.628& 0.998$ 1.073& 0.163& 0.058& 0.004& 0.381& 0.110& 0 2012
2013 0.016& 0.000 0.000 0.085& 0.175& 0.261& 2.480& 5.422" 8.082" 1.217& 0.044& 0.000 1.482& 0.130& 0 2013
2014 0.000 0.000 0.000 0.000 0.717& 1.442& 5.095# 2.740" 3.411# 0.601& 0.052& 0.000" 1.171& 0.326& 0 2014
2015 0.000" 0.000" 0.000" 0.000" 0.000" 0.127& 0.353& 4.436" 0.619& 0.032& 0.001& 0.000 0.464& 0.000& 0 2015
2016 0.175& 0.404& 0.378& 1.380& 3.155$ 3.142" 5.786" 7.467" 3.204" 0.798& 0.036& 0.021& 2.162& 1.089& 0 2016
2017 0.109& 63.76 & 9.433# 0.458& 0.465& 0.491& 2.590# 14.32 " 4.388" 1.485$ 0.223& 0.007& 8.143& 0.988& 0 2017
2018 1.021& 0.054& 0.136& 0.000" 0.134& 1.660& 8.770" 18.88 " 3.303# 0.857& 0.047& 0.000 2.905& 0.497& 0 2018
2019 0.000 0.000 0.000 0.000 0.000 1.068& 4.441" 3.622" 3.360& 0.141& 0.012& 0.000 1.054& 0.006& 0 2019
2020 0.000 0.000 0.000 0.000 0.000 0.080& 1.280$ 1.704$ 0.658& 0.087& 0.056& 0.000& 0.322& 0.028& 0 2020
2021 0.000 0.000 1.967& 0.052& 2.251& 3.663" 55.89 " 51.87 " 7.678" 2.021# 0.672& 0.015& 10.51 & 1.994& 0 2021
2022 0.000 0.000 0.000 0.000 0.187& 4.694& 4.931" 55.97 " 22.72 " 2.400# 0.364& 0.012& 7.607& 0.276& 0 2022
2023 0.000 0.000 2.489& 5.143" 2.186$ 12.15 # 4.904" 6.493" 2.860# 0.301& 0.014& 0.000 3.045& 2.337& 0 2023
2024 0.000 0.000 0.000 0.000 0.000 0.584& 3.150$ 12.00 " 3.334$ 0.490& 0.030& 0.000 1.632& 0.015& 0 2024
2025 0.000 0.000 0.000 0.000 0.000 0.000 1.323& 16.72 " 6.354" 0.514& [0.711] [ ] [2.330] [0.000] 50 2025
50 Total
Mean 1.281! 2.745! 0.535& 0.322! 0.894! 4.317! 12.08 & 12.93 ! 5.921! 1.243! [0.305] 0.044& [3.555] Mean
Med. 0.000! 0.000! 0.000& 0.000! 0.190! 1.998! 5.786& 9.044! 3.411! 0.798! [0.089] 0.000& [0.356] Med.
Max 40.71 ! 63.76 ! 9.433& 5.143! 7.940! 33.23 ! 85.56 & 55.97 ! 38.81 ! 8.070! [2.086] 0.634& [15.94 ] Max
Min 0.000! 0.000! 0.000& 0.000! 0.000! 0.000! 0.353& 0.850! 0.222! 0.013! [0.000] 0.000& [0.322] Min
OK 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 99% 100% 100% OK
Cnt 49 49 49 49 49 49 49 49 49 49 49 48 49 Cnt
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
! ... Not reviewed / Quality not known
" ... Relative Uncertainty +/-10%
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
[ ... Not Available
Department of Water and Environmental Regulation HYMONTH V128 Output 13/11/2025
Site 615062 Avon River - Northam Weir Site 615062
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
1977 0.000# 0.000# 0.000# 0.000 0.000 1.765& 2.468& 22.29 $ 1.421& 7.021& 5.733& 0.000 22.29 & 0 1977
1978 0.000 0.919& 0.253& 0.000 3.873& 12.06 $234.4 " 30.71 " 7.471" 8.422& 0.086& 0.000 234.4 & 0 1978
1979 0.710& 0.000 0.000 0.000 4.193& 20.03 # 10.37 " 54.45 ! 4.615! 0.759! 0.001! 0.000 54.45 ! 0 1979
1980 0.000 0.000 0.000 0.000 0.832& 6.588& 6.759" 3.504" 1.706& 5.567& 0.832& 0.000 6.759& 0 1980
1981 0.000 0.000 0.077& 0.000 150.2 &192.8 "111.9 "107.5 ! 9.345" 2.133& 34.49 & 0.141& 192.8 ! 0 1981
1982 55.37 ! 1.303& 0.000 0.000 0.919& 5.486& 11.28 # 14.54 " 8.033# 3.797& 4.275& 1.983& 55.37 ! 0 1982
1983 0.000 0.000 0.206& 0.188& 0.000!272.6 !354.6 "111.9 "135.7 " 5.567& 8.226& 4.359& 354.6 ! 0 1983
1984 3.225& 0.000 0.000 1.258& 31.21 # 16.42 " 21.29 " 18.20 " 96.21 " 2.330& 1.311& 0.014& 96.21 & 0 1984
1985 0.000 0.000 0.000 0.000 0.000 0.749& 19.63 # 17.50 " 6.387" 1.258& 0.305& 0.048& 19.63 & 0 1985
1986 0.000 13.50 ! 2.616& 0.022& 3.649! 94.84 $ 42.21 "105.0 " 7.966" 2.468& 0.672& 0.010& 105.0 ! 0 1986
1987 0.000 0.000 0.000 0.000 11.28 & 5.486& 86.86 " 42.68 " 5.170# 2.018& 0.106& 0.278& 86.86 & 0 1987
1988 0.010& 0.000 0.000 0.000 2.133& 23.57 !123.0 " 53.77 " 9.791" 20.31 ! 0.385& 5.170& 123.0 ! 0 1988
1989 0.000 0.000 0.000 0.000 8.620& 23.87 " 48.68 " 16.82 ! 2.468! 1.536& 0.412& 0.001& 48.68 ! 0 1989
1990 192.1 & 61.61 " 15.22 $ 4.865& 8.520" 4.359# 43.80 # 29.39 " 4.031" 2.007& 0.441& 0.000 192.1 & 0 1990
1991 0.000 0.000 0.000 0.000 0.000 8.620& 40.78 " 88.16 " 14.28 # 1.059& 0.566& 0.501& 88.16 & 0 1991
1992 0.035& 0.000& 0.000 7.563& 0.672& 40.39 & 37.00 " 65.93 " 59.63 " 18.48 # 4.865& 0.600& 65.93 & 0 1992
1993 0.000 0.229& 11.50 & 0.749& 3.952& 20.87 # 14.67 " 32.74 " 20.59 " 3.363& 2.398& 0.188& 32.74 & 0 1993
1994 0.000 0.000 0.000 0.000 15.90 & 19.76 " 24.90 " 54.45 " 9.345& 0.600& 0.095& 0.000 54.45 & 0 1994
1995 0.000 0.000 0.000 0.000 2.757& 26.38 & 92.94 " 41.52 " 16.03 " 38.30 & 0.875& 0.056& 92.94 & 0 1995
1996 0.000 0.000 0.000 0.000 0.000 45.25 &191.7 "176.0 " 18.34 " 8.699# 13.50 & 0.359& 191.7 & 0 1996
1997 0.000 0.000 19.63 & 16.96 $ 1.478& 5.486# 5.016# 20.45 " 29.39 " 2.757& 0.533& 0.000& 29.39 & 0 1997
1998 0.000 0.000 0.000 0.000! 0.000! 16.16 ! 14.01 "129.0 " 84.11 " 5.898& 0.334& 0.000& 129.0 ! 0 1998
1999 14.67 & 0.010& 0.000 0.000 15.90 & 25.66 " 70.77 " 57.94 " 34.66 " 24.46 " 3.723& 5.814& 70.77 & 0 1999
2000 172.4 &105.2 " 11.72 $ 2.401& 0.965& 4.615& 59.14 " 20.45 " 28.45 " 1.536& 0.412& 0.000 172.4 & 0 2000
2001 0.000 0.000 0.000 0.000 0.000 0.635& 20.97 & 32.23 " 3.433$ 3.649& 0.278& 0.030& 32.23 & 0 2001
2002 0.000 0.000 0.000 0.000 0.229& 1.311& 5.170# 4.615# 5.486& 1.012& 0.229& 0.000 5.486& 0 2002
2003 0.000 0.000 0.000 2.198& 3.294& 22.29 & 28.00 " 26.81 " 7.289" 3.294& 0.129& 0.000 28.00 & 0 2003
2004 0.000 0.000 0.000 0.000 0.000 5.814& 8.620# 13.12 " 8.033$ 1.591& 0.206& 0.000 13.12 & 0 2004
2005 0.000 0.000 0.000 7.471& 28.60 & 44.83 " 20.87 " 26.52 " 13.00 " 4.275& 0.385& 0.000 44.83 & 0 2005
2006 24.90 & 5.248& 0.141& 0.117& 0.305& 0.832& 2.398& 11.39 # 5.406# 1.365& 0.229& 0.000 24.90 & 0 2006
2007 0.000 0.000 0.000 0.000 0.000 2.468& 21.72 # 30.71 " 10.72 " 2.757& 0.141& 0.000 30.71 & 0 2007
2008 0.000 0.000 0.000 3.873& 1.765& 5.814$102.8 "116.6 " 6.415# 32.92 $ 1.825& 0.749& 116.6 & 0 2008
2009 28.30 & 4.615& 3.363& 0.000 0.000 7.109& 67.45 " 44.83 " 13.25 " 2.960& 0.501& 0.106& 67.45 & 0 2009
2010 0.000 0.000 11.17 & 1.311& 1.156& 1.156& 7.379& 2.610$ 0.470& 0.095& 0.000 0.000 11.17 & 0 2010
2011 0.000 0.000 0.000 0.000# 0.000 2.468& 20.93 # 43.19 " 5.649" 5.327$ 5.092& 2.007& 43.19 & 0 2011
50 Total
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
! ... Not reviewed / Quality not known
" ... Relative Uncertainty +/-10%
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
[ ... Not Available Department of Water and Environmental Regulation HYMONTH V128 Output 13/11/2025
Site 615062 Avon River - Northam Weir Site 615062
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
2012 1.946& 1.059& 0.000 0.000 0.000 4.790& 1.258& 2.538$ 4.865& 0.875& 1.106& 0.095& 4.865& 0 2012
2013 0.470& 0.000 0.000 0.470& 0.533& 0.710& 10.37 & 18.77 " 20.87 " 3.797& 0.334& 0.000 20.87 & 0 2013
2014 0.000 0.000 0.000 0.000 3.294& 3.873& 11.28 # 5.814" 10.84 # 2.468& 0.412& 0.000" 11.28 & 0 2014
2015 0.000" 0.000" 0.000" 0.000" 0.000" 1.206& 2.832& 11.95 " 1.421& 0.170& 0.016& 0.000 11.95 & 0 2015
2016 3.649& 3.504& 14.28 & 4.865& 7.471$ 5.814" 12.18 " 13.25 " 8.805" 2.007& 0.154& 0.441& 14.28 & 0 2016
2017 5.248&195.8 & 25.51 # 0.965& 0.875& 1.012& 7.109# 38.30 " 7.938" 4.528$ 0.635& 0.095& 195.8 & 0 2017
2018 6.327& 0.832& 1.648& 0.000" 1.765& 6.933& 27.25 " 78.19 " 15.63 # 3.433& 0.253& 0.000 78.19 & 0 2018
2019 0.000 0.000 0.000 0.000 0.000 6.933& 10.60 " 7.843" 14.54 & 0.412& 0.141& 0.000 14.54 & 0 2019
2020 0.000 0.000 0.000 0.000 0.000 1.478& 3.091$ 5.016$ 2.832& 0.470& 0.305& 0.002& 5.016& 0 2020
2021 0.000 0.000 16.82 & 0.154& 15.08 & 9.455"187.1 "129.6 " 14.28 " 3.504# 3.025& 0.170& 187.1 & 0 2021
2022 0.000 0.000 0.000 0.000 2.133& 12.53 & 12.18 "187.1 " 50.87 " 5.982# 1.365& 0.129& 187.1 & 0 2022
2023 0.000 0.000 56.29 & 12.18 " 6.240$ 61.11 # 10.25 " 17.64 " 10.13 # 1.059& 0.117& 0.000 61.11 & 0 2023
2024 0.000 0.000 0.000 0.000 0.000 1.825& 14.81 $ 49.12 " 11.61 $ 1.591& 0.790& 0.000 49.12 & 0 2024
2025 0.000 0.000 0.000 0.000 0.000 0.000 7.938& 63.89 " 23.72 " 1.258& [3.797] [ ] [63.89 ] 50 2025
50 Total
Mean 10.39 ! 8.039! 3.886& 1.380! 6.935! 22.58 ! 46.79 & 46.87 ! 18.22 ! 5.329! [2.164] 0.486& [78.42 ] Mean
Med. 0.000! 0.000! 0.000& 0.000! 0.965! 6.588! 20.87 & 30.71 ! 9.345! 2.757! [0.412] 0.001& Med.
Max 192.1 !195.8 ! 56.29 & 16.96 !150.2 !272.6 !354.6 &187.1 !135.7 ! 38.30 ![34.49 ] 5.814& [354.6 ] Max
Min 0.000! 0.000! 0.000& 0.000! 0.000! 0.000! 1.258& 2.538! 0.470! 0.095! [0.000] 0.000& [4.865] Min
OK 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 99% 100% 100% OK
Cnt 49 49 49 49 49 49 49 49 49 49 49 48 49 Cnt
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
! ... Not reviewed / Quality not known
" ... Relative Uncertainty +/-10%
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
[ ... Not Available
Department of Water and Environmental Regulation HYMONTH V128 Output 13/11/2025
Site 615062 Avon River - Northam Weir Site 615062
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
1977 0.000# 0.000# 0.000# 0.000 0.000 0.000& 0.278& 0.470$ 0.278& 0.014& 0.000& 0.000 0.000& 0 1977
1978 0.000 0.000& 0.000& 0.000 0.000& 0.441$ 2.330" 5.567" 2.070" 0.057& 0.000& 0.000 0.000& 0 1978
1979 0.000& 0.000 0.000 0.000 0.000& 0.600# 2.330" 0.141! 0.672! 0.000! 0.000! 0.000 0.000! 0 1979
1980 0.000 0.000 0.000 0.000 0.000& 0.141& 1.156" 1.012" 0.141& 0.030& 0.000& 0.000 0.000& 0 1980
1981 0.000 0.000 0.000& 0.000 0.000& 7.379" 4.275" 8.323! 1.311" 0.170& 0.095& 0.000& 0.000! 0 1981
1982 0.000! 0.000& 0.000 0.000 0.000& 0.129& 0.965# 2.263" 0.635# 0.106& 0.002& 0.000& 0.000! 0 1982
1983 0.000 0.000 0.000& 0.000& 0.000! 0.000! 14.67 " 14.94 " 5.567" 0.305& 0.117& 0.000& 0.000! 0 1983
1984 0.000& 0.000 0.000 0.000& 0.832# 3.504" 3.504" 3.952" 2.070" 0.106& 0.009& 0.000& 0.000& 0 1984
1985 0.000 0.000 0.000 0.000 0.000 0.000& 0.635# 2.757" 1.206" 0.026& 0.000& 0.000& 0.000& 0 1985
1986 0.000 0.000! 0.018& 0.000& 0.000! 0.334$ 5.486" 7.966" 1.156" 0.129& 0.010& 0.000& 0.000! 0 1986
1987 0.000 0.000 0.000 0.000 0.000& 0.229& 1.258" 2.960" 0.965# 0.041& 0.000& 0.000& 0.000& 0 1987
1988 0.000& 0.000 0.000 0.000 0.000& 0.672! 4.031" 4.528" 1.825" 0.278! 0.000& 0.000& 0.000! 0 1988
1989 0.000 0.000 0.000 0.000 0.000& 1.886" 5.248" 2.468! 0.635! 0.170& 0.000& 0.000& 0.000! 0 1989
1990 0.000& 6.673" 0.385$ 0.206& 1.106" 0.919# 0.832# 3.504" 1.311" 0.188& 0.000& 0.000 0.000& 0 1990
1991 0.000 0.000 0.000 0.000 0.000 0.000& 3.225" 4.031" 0.965# 0.056& 0.002& 0.000& 0.000& 0 1991
1992 0.000& 0.000& 0.000 0.000& 0.129& 0.170& 6.327" 5.898" 17.23 " 0.710# 0.305& 0.000& 0.000& 0 1992
1993 0.000 0.000& 0.000& 0.106& 0.188& 0.875# 3.091" 5.016" 1.825" 0.141& 0.129& 0.000& 0.000& 0 1993
1994 0.000 0.000 0.000 0.000 0.000& 1.012" 3.433" 2.007" 0.278& 0.012& 0.000& 0.000 0.000& 0 1994
1995 0.000 0.000 0.000 0.000 0.000& 0.253& 1.765" 5.731" 1.156" 0.206& 0.030& 0.000& 0.000& 0 1995
1996 0.000 0.000 0.000 0.000 0.000 0.000& 7.843" 9.791" 5.567" 0.635# 0.154& 0.000& 0.000& 0 1996
1997 0.000 0.000 0.000& 0.334$ 0.206& 0.919# 0.749# 1.886" 2.007" 0.188& 0.000& 0.000& 0.000& 0 1997
1998 0.000 0.000 0.000 0.000! 0.000! 0.000! 2.610" 1.478" 3.294" 0.106& 0.000& 0.000& 0.000! 0 1998
1999 0.000& 0.000& 0.000 0.000 0.000& 1.206" 8.226" 6.415" 6.846" 1.059" 0.095& 0.000& 0.000& 0 1999
2000 0.170& 1.706" 0.359$ 0.229& 0.206& 0.229& 1.591" 4.193" 1.478" 0.095& 0.000& 0.000 0.000& 0 2000
2001 0.000 0.000 0.000 0.000 0.000 0.000& 0.117& 2.330" 0.533$ 0.129& 0.000& 0.000& 0.000& 0 2001
2002 0.000 0.000 0.000 0.000 0.000& 0.041& 0.965# 0.749# 0.229& 0.048& 0.000& 0.000 0.000& 0 2002
2003 0.000 0.000 0.000 0.000& 0.041& 0.154& 3.157" 3.797" 1.591" 0.077& 0.000& 0.000 0.000& 0 2003
2004 0.000 0.000 0.000 0.000 0.000 0.000& 0.832# 1.365" 0.441$ 0.070& 0.000& 0.000 0.000& 0 2004
2005 0.000 0.000 0.000 0.000& 0.035& 2.610" 3.576" 2.398" 1.765" 0.305& 0.000& 0.000 0.000& 0 2005
2006 0.000& 0.063& 0.000& 0.000& 0.077& 0.141& 0.278& 0.749# 0.919# 0.154& 0.000& 0.000 0.000& 0 2006
2007 0.000 0.000 0.000 0.000 0.000 0.000& 0.600# 3.433" 1.365" 0.086& 0.000& 0.000 0.000& 0 2007
2008 0.000 0.000 0.000 0.000& 0.063& 0.566$ 1.311" 2.263" 0.919# 0.533$ 0.106& 0.000& 0.000& 0 2008
2009 0.000& 0.000& 0.000& 0.000 0.000 0.000& 3.225" 5.486" 2.683" 0.206& 0.016& 0.000& 0.000& 0 2009
2010 0.000 0.000 0.000& 0.018& 0.002& 0.117& 0.206& 0.334$ 0.030& 0.000& 0.000 0.000 0.000& 0 2010
2011 0.000 0.000 0.000 0.000# 0.000 0.000& 0.832# 3.157" 1.012" 0.385$ 0.009& 0.000& 0.000& 0 2011
50 Total
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
! ... Not reviewed / Quality not known
" ... Relative Uncertainty +/-10%
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
[ ... Not Available Department of Water and Environmental Regulation HYMONTH V128 Output 13/11/2025
Site 615062 Avon River - Northam Weir Site 615062
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
2012 0.000& 0.000& 0.000 0.000 0.000 0.000& 0.229& 0.359$ 0.188& 0.000& 0.000& 0.000& 0.000& 0 2012
2013 0.000& 0.000 0.000 0.000& 0.000& 0.117& 0.106& 1.591" 2.538" 0.170& 0.000& 0.000 0.000& 0 2013
2014 0.000 0.000 0.000 0.000 0.000& 0.253& 0.710# 1.106" 0.672# 0.129& 0.000& 0.000" 0.000& 0 2014
2015 0.000" 0.000" 0.000" 0.000" 0.000" 0.000& 0.117& 1.206" 0.086& 0.000& 0.000& 0.000 0.000& 0 2015
2016 0.000& 0.000& 0.000& 0.041& 0.470$ 1.311" 1.365" 4.940" 1.311" 0.086& 0.000& 0.000& 0.000& 0 2016
2017 0.000& 0.253& 0.875# 0.278& 0.253& 0.278& 0.749# 5.092" 1.946" 0.501$ 0.035& 0.000& 0.000& 0 2017
2018 0.000& 0.000& 0.000& 0.000" 0.000& 0.229& 3.797" 4.359" 0.635# 0.154& 0.000& 0.000 0.000& 0 2018
2019 0.000 0.000 0.000 0.000 0.000 0.000& 1.886" 1.421" 0.305& 0.014& 0.000& 0.000 0.000& 0 2019
2020 0.000 0.000 0.000 0.000 0.000 0.000& 0.441$ 0.385$ 0.170& 0.000& 0.000& 0.000& 0.000& 0 2020
2021 0.000 0.000 0.000& 0.000& 0.016& 1.765" 2.007" 11.61 " 2.133" 0.875# 0.070& 0.000& 0.000& 0 2021
2022 0.000 0.000 0.000 0.000 0.000& 0.305& 1.946" 11.06 " 5.814" 0.672# 0.063& 0.000& 0.000& 0 2022
2023 0.000 0.000 0.000& 2.683" 0.533$ 0.672# 2.960" 2.070" 0.790# 0.041& 0.000& 0.000 0.000& 0 2023
2024 0.000 0.000 0.000 0.000 0.000 0.000& 0.412$ 6.153" 0.501$ 0.041& 0.000& 0.000 0.000& 0 2024
2025 0.000 0.000 0.000 0.000 0.000 0.000 0.000& 2.330" 1.206" 0.117& [0.026] [ ] [0.000] 50 2025
50 Total
Mean 0.003! 0.177! 0.033& 0.080! 0.085! 0.601! 2.402& 3.817! 1.842! 0.196! [0.026] 0.000& [0.000] Mean
Med. 0.000! 0.000! 0.000& 0.000! 0.000! 0.170! 1.591& 2.960! 1.156! 0.117! [0.000] 0.000& Med.
Max 0.170! 6.673! 0.875& 2.683! 1.106! 7.379! 14.67 & 14.94 ! 17.23 ! 1.059! [0.305] 0.000& [0.000] Max
Min 0.000! 0.000! 0.000& 0.000! 0.000! 0.000! 0.000& 0.141! 0.030! 0.000! [0.000] 0.000& [0.000] Min
OK 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 99% 100% 100% OK
Cnt 49 49 49 49 49 49 49 49 49 49 49 48 49 Cnt
------------------ Notes -------------------
All recorded data is continuous and reliable
except where the following tags are used...
! ... Not reviewed / Quality not known
" ... Relative Uncertainty +/-10%
# ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
[ ... Not Available