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Statistics of monthly and annual mean discharges __________________________________________________________________________________________________________
Maximum Minimum Mean
______________________ ______________________ _____________________________________________
Water year Water year Standard Coeffi- Percentage
Month Discharge of Discharge of Discharge deviation cient of of annual
(ft3/s) occurrence (ft3/s) occurrence (ft3/s) (ft3/s) variation discharge
__________________________________________________________________________________________________________
October 70.0 1945 0.165 1951 17.4 22.4 1.29 3.76
November 46.3 1947 0.133 1951 13.7 17.6 1.29 2.98
December 56.5 1952 0.235 1949 18.9 22.0 1.16 4.10
January 55.4 1952 0.216 1950 18.4 18.8 1.02 4.00
February 41.4 1952 0.421 1949 16.6 14.2 0.85 3.61
March 77.2 1953 1.05 1949 28.2 21.4 0.76 6.13
April 131 1953 29.8 1944 77.9 31.8 0.41 16.9
May 167 1950 27.9 1949 82.9 38.1 0.46 18.0
June 198 1953 9.06 1952 71.5 57.2 0.80 15.5
July 118 1946 4.25 1945 53.2 37.8 0.71 11.5
August 147 1952 0.326 1945 35.4 43.5 1.23 7.69
September 111 1944 0.197 1950 26.8 37.7 1.41 5.81
Annual 64.8 1952 12.1 1949 39.0 16.5 0.42 100
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Monthly and annual flow duration, in cubic feet per second
______________________________________________________________________________________________________________________
Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
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95 0.20 0.35 0.58 22.3 26.0 2.80 0.37 0.30 0.19 0.18 0.10 0.18 0.20
90 0.20 0.35 1.00 25.1 33.7 7.80 11.2 0.30 0.19 0.18 0.18 0.18 0.26
85 0.48 0.47 1.00 30.4 46.1 16.5 14.4 0.46 0.19 0.18 0.18 0.26 0.41
80 0.80 1.00 1.50 39.5 51.3 22.6 16.1 1.00 0.36 0.18 0.18 0.48 1.00
75 2.70 1.60 11.2 46.0 53.7 25.7 18.4 1.90 0.36 0.28 0.39 1.00 2.70
70 3.80 7.99 19.3 52.0 58.0 28.1 21.5 6.98 0.56 0.34 0.48 1.00 7.25
65 5.45 8.87 20.6 59.8 62.5 35.5 26.5 8.54 0.86 0.42 0.48 1.30 11.5
60 6.14 9.31 22.0 67.2 67.3 51.4 31.0 12.4 2.00 0.51 0.70 1.90 16.8
55 7.15 10.4 23.2 73.7 76.1 55.4 35.8 14.5 3.90 1.70 1.90 3.30 21.6
50 8.19 13.3 24.3 78.8 80.6 60.2 40.7 17.4 7.67 10.3 4.00 8.25 25.5
45 18.5 19.3 25.3 83.9 85.1 65.5 45.8 21.7 10.0 13.6 7.61 16.3 30.0
40 22.9 21.1 26.4 89.2 89.6 78.8 53.8 27.7 17.0 14.9 10.6 19.6 35.9
35 25.4 23.4 27.5 94.6 93.9 84.7 64.3 33.9 22.7 16.2 13.3 23.3 43.6
30 31.5 26.1 29.2 100 98.6 91.5 74.9 43.7 26.1 18.6 15.4 26.1 51.0
25 35.5 28.4 31.7 107 104 98.9 84.5 56.7 41.0 28.4 18.3 42.4 59.7
20 38.1 30.9 34.2 114 115 108 95.3 67.0 62.2 37.8 35.0 46.5 71.5
15 40.5 33.6 39.4 122 121 134 106 78.6 73.9 47.2 43.4 50.5 86.6
10 43.0 36.8 51.6 134 136 168 118 94.4 98.8 54.1 46.9 54.6 104
5 55.8 41.1 102 152 170 194 133 141 113 66.9 50.4 58.8 131
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Probability of annual high discharges
[ng, statistic not given]
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Maximum average discharge
(ft3/s)
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Recurrence Maximum
Exceedance interval instantaneous 3-day period 7-day period 15-day period 30-day period
probability (years) (ft3/s)
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0.99 1.01 57.8 61.7 58.2 51.5 40.9
0.95 1.05 76.2 76.1 72.5 66.4 56.6
0.90 1.11 87.7 85.3 81.6 75.9 66.8
0.80 1.25 104 98.2 94.3 89.1 80.7
0.50 2 140 129 125 120 113
0.20 5 186 172 167 161 153
0.10 10 214 201 195 187 177
0.04 25 246 237 230 220 205
0.02 50 269 264 256 243 225
0.01 100 291 291 282 266 243
0.005 200 312 319 309 288 260
0.002 500 340 ng ng ng ng
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Probability of annual low discharges
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Minimum average discharge (ft3/s)
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Number of consecutive days
______________________________________________________________________
Non- Recur-
exceed- rence
ance inter- 1 3 7 14 30 60 90 120 183
prob- val
ability (years)
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0.05 20 0.064 10.064 10.065 10.066 10.067 10.068 10.069 0.069 0.257
0.10 10 0.089 10.089 10.090 10.090 0.091 0.106 0.116 0.130 0.516
0.20 5 0.143 0.143 0.144 0.151 0.177 0.242 0.261 0.295 1.18
0.50 2 0.470 0.491 0.561 0.625 0.808 1.35 1.45 1.65 5.32
__________________________________________________________________________________________
1Graphical interpretation.
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Probability of seasonal low discharges
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Minimum average discharge (ft3/s)
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Number of consecutive days
_________________________________________________________________
Non- Recurrence
exceedance interval 1 7 14 30 1 7 14 30
probability (years)
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December-January-February March-April-May
_____________________________ ____________________________
0.05 20 0.054 0.058 0.064 0.115 0.329 0.422 0.474 1.27
0.10 10 0.125 0.151 0.164 0.273 0.820 1.01 1.12 2.90
0.20 5 0.341 0.456 0.486 0.743 2.20 2.60 2.85 6.85
0.50 2 2.28 3.30 3.44 4.48 10.2 11.3 12.0 23.7
June-July-August September-October-November
_____________________________ ____________________________
0.05 20 0.108 0.111 0.176 0.323 0.054 10.055 0.055 0.065
0.10 10 0.279 0.292 0.421 0.770 0.098 0.099 0.107 0.133
0.20 5 0.813 0.869 1.14 2.02 0.206 0.223 0.248 0.319
0.50 2 4.92 5.47 6.28 10.0 0.945 1.16 1.35 1.80
_____________________________________________________________________________________________
1Graphical interpretation.
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Annual peak discharge and corresponding gage height, period of record
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Gage Peak Gage Peak
Water Date height discharge Water Date height discharge
year (feet) (ft3/s) year (feet) (ft3/s)
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Annual peak discharge, by year, and corresponding gage height
1943 June 26 3.84 136 1949 April 10 2.82 75.0
1944 September 2 3.82 136 1950 May 19 5.10 210
1945 April 22 3.54 115 1951 June 3 2.84 117
1946 July 18 4.07 145 1952 August 15 4.40 214
1947 May 2 3.86 133 1953 June 20 4.28 229
1948 May 7 3.20 94.0
Annual peak discharge, from highest to lowest, and corresponding gage height
1953 June 20 4.28 229 1947 May 2 3.86 133
1952 August 15 4.40 214 1951 June 3 2.84 117
1950 May 19 5.10 210 1945 April 22 3.54 115
1946 July 18 4.07 145 1948 May 7 3.20 94.0
1943 June 26 3.84 136 1949 April 10 2.82 75.0
1944 September 2 3.82 136
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Monthly and annual mean discharges, in cubic feet per second
[Data were not rounded in accordance with U.S. Geological Survey publication standards; --, no data]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1942 -- -- -- -- -- -- -- -- -- 23.9 7.11 26.1 --
1943 14.5 14.6 19.2 29.5 27.2 25.2 70.2 82.8 104.8 67.6 18.9 3.15 39.8
1944 8.62 5.13 8.12 6.13 9.11 16.1 29.8 56.3 63.8 62.1 68.1 111.3 37.0
1945 70.0 44.0 43.2 37.5 33.5 49.3 100.3 79.9 51.0 4.25 0.326 0.213 42.8
1946 0.200 5.92 24.5 23.0 20.7 34.5 77.8 43.2 35.1 117.8 54.8 13.9 37.8
1947 48.4 46.3 51.6 35.8 26.8 27.5 95.7 114.3 84.6 36.0 1.02 0.423 47.4
1948 0.445 0.530 1.79 5.21 8.97 19.8 63.0 75.8 25.9 18.5 10.1 1.85 19.3
1949 0.239 0.220 0.235 0.384 0.421 1.05 41.8 27.9 9.63 28.4 29.8 3.98 12.1
1950 0.561 0.457 0.606 0.216 0.439 1.90 117.5 166.8 133.6 37.5 1.51 0.197 38.5
1951 0.165 0.133 0.797 8.00 13.2 23.9 46.0 64.3 70.9 33.1 16.2 15.6 24.4
1952 32.9 35.0 56.5 55.4 41.4 34.3 83.8 92.1 9.06 103.0 147.2 83.7 64.8
1953 13.5 2.61 1.43 1.56 1.38 77.2 130.8 108.8 198.0 105.9 70.1 61.2 64.5
1954 18.7 9.75 -- -- -- -- -- -- -- -- -- -- --
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