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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 34.7 1972 1.15 1968 7.93 9.12 1.15 4.87
November 31.4 1972 1.45 1977 6.87 6.88 1.00 4.22
December 13.6 1978 0.314 1977 4.53 3.44 0.76 2.78
January 8.99 1974 0.396 1977 3.17 2.20 0.69 1.95
February 7.38 1974 0.393 1968 2.77 1.84 0.66 1.70
March 37.5 1966 2.07 1971 12.4 11.9 0.97 7.60
April 118 1966 6.91 1977 58.2 30.9 0.53 35.7
May 105 1962 4.61 1977 29.1 22.4 0.77 17.9
June 54.4 1962 2.29 1961 18.2 16.8 0.92 11.2
July 57.3 1962 2.10 1961 9.31 13.7 1.47 5.72
August 18.7 1966 1.09 1976 3.79 3.97 1.05 2.33
September 59.3 1973 0.623 1967 6.57 12.8 1.94 4.04
Annual 25.3 1962 3.56 1977 13.8 5.79 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
______________________________________________________________________________________________________________________
95 0.59 0.66 0.93 4.60 3.30 1.50 1.00 0.79 0.54 0.89 1.60 0.43 0.74
90 1.10 0.76 1.20 6.81 5.30 2.20 1.50 0.93 0.81 1.30 1.90 1.30 1.20
85 1.20 0.99 1.50 8.55 6.64 2.50 1.80 1.10 1.20 1.50 2.20 1.50 1.60
80 1.20 1.10 1.90 13.4 7.65 3.00 1.80 1.10 1.20 1.90 2.20 1.90 1.60
75 1.40 1.30 1.90 17.9 8.83 3.50 2.20 1.30 1.50 2.20 2.50 2.20 2.00
70 1.70 1.30 2.50 21.1 10.5 4.20 2.20 1.50 1.80 2.70 2.90 2.50 2.00
65 1.90 1.50 2.50 24.2 12.6 4.90 2.60 1.50 1.80 3.20 3.80 2.80 2.60
60 2.10 1.70 2.50 27.9 14.7 6.34 2.60 1.80 1.80 3.20 3.80 2.80 2.60
55 2.30 2.20 3.20 31.4 16.7 7.17 3.20 2.00 2.20 3.20 4.40 3.20 3.65
50 2.60 2.20 3.20 36.9 18.6 7.90 3.20 2.00 2.20 3.80 4.40 3.60 4.11
45 3.20 2.50 3.20 42.5 20.4 9.70 3.80 2.00 2.20 3.80 5.10 3.60 4.62
40 3.20 2.90 4.48 51.8 23.6 11.3 3.80 2.40 2.70 4.60 5.10 4.10 5.18
35 3.60 3.30 4.86 61.4 26.9 13.5 4.60 2.80 2.70 5.88 5.90 4.60 6.05
30 3.60 3.30 5.44 71.3 30.6 16.3 5.91 2.80 3.30 6.71 5.90 4.60 7.70
25 4.00 3.80 6.07 82.2 35.2 20.9 6.82 3.30 4.00 8.01 7.15 5.20 9.50
20 4.50 3.80 9.15 98.0 40.7 27.8 7.58 3.80 5.60 9.51 8.06 5.90 14.0
15 4.50 4.40 21.3 113 47.4 35.7 8.87 4.50 7.34 11.9 10.2 7.70 21.0
10 6.10 5.00 34.7 138 63.0 46.9 14.0 7.13 11.2 15.5 14.8 10.5 34.6
5 8.56 6.60 52.0 173 97.0 64.5 28.0 12.3 24.0 28.4 20.3 13.2 65.8
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Probability of annual high discharges
[ng, statistic not given]
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Maximum average discharge
(ft3/s)1
___________________________________________________________
Recurrence Maximum
Exceedance interval instantaneous 3-day period 7-day period 15-day period 30-day period
probability (years) (ft3/s)
__________________________________________________________________________________________________
0.99 1.01 ng 22.5 21.3 16.6 10.2
0.95 1.05 68.0 47.2 43.2 33.1 22.1
0.90 1.11 88.6 66.8 59.8 45.3 31.4
0.80 1.25 120 97.5 84.7 63.4 45.1
0.50 2 200 177 144 106 76.7
0.20 5 313 275 210 152 108
0.10 10 384 329 241 173 121
0.04 25 469 383 271 193 132
0.02 50 528 416 287 204 136
0.01 100 583 442 299 212 140
0.005 200 635 464 308 218 142
0.002 500 700 ng ng ng ng
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1 Statistics computed using period of daily value
record 1961-78.
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Annual peak discharge and corresponding gage height, period of record
[--, no data]
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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
1960 April 17 4.45 74.0 1979 April 20 4.94 284
1961 April 20 3.74 66.0 1980 April 5 3.36 137
1962 July 7 6.70 364 1981 June 28 -- 150
1963 May 28 5.48 225 1982 April 15 4.59 249
1964 April 16 4.45 134 1983 March 7 4.81 175
1965 April 13 6.38 412 1984 March 26 4.03 195
1966 April 2 5.53 265 1985 May 13 4.91 281
1967 March 30 6.35 453 1986 March 29 4.61 190
1968 June 10 2.70 76.0 1987 July 22 6.05 395
1969 April 9 6.62 232 1988 April 4 5.20 165
1970 April 29 5.28 279 1989 April 5 4.44 178
1971 April 8 5.40 176 1990 June 20 -- 30.0
1972 April 17 4.87 237 1991 July 3 2.29 66.0
1973 September 2 3.94 156 1992 March 7 3.25 98.0
1974 April 12 5.80 268 1993 March 29 3.74 169
1975 April 17 5.74 364 1994 July 19 2.85 112
1976 March 29 5.25 147 1995 March 13 6.10 200
1977 September 24 2.05 47.0 1996 April 19 5.78 455
1978 April 7 5.67 357 1997 April 14 5.24 390
Annual peak discharge, from highest to lowest, and corresponding gage height
1996 April 19 5.78 455 1986 March 29 4.61 190
1967 March 30 6.35 453 1989 April 5 4.44 178
1965 April 13 6.38 412 1971 April 8 5.40 176
1987 July 22 6.05 395 1983 March 7 4.81 175
1997 April 14 5.24 390 1993 March 29 3.74 169
1962 July 7 6.70 364 1988 April 4 5.20 165
1975 April 17 5.74 364 1973 September 2 3.94 156
1978 April 7 5.67 357 1981 June 28 -- 150
1979 April 20 4.94 284 1976 March 29 5.25 147
1985 May 13 4.91 281 1980 April 5 3.36 137
1970 April 29 5.28 279 1964 April 16 4.45 134
1974 April 12 5.80 268 1994 July 19 2.85 112
1966 April 2 5.53 265 1992 March 7 3.25 98.0
1982 April 15 4.59 249 1968 June 10 2.70 76.0
1972 April 17 4.87 237 1960 April 17 4.45 74.0
1969 April 9 6.62 232 1961 April 20 3.74 66.0
1963 May 28 5.48 225 1991 July 3 2.29 66.0
1995 March 13 6.10 200 1977 September 24 2.05 47.0
1984 March 26 4.03 195 1990 June 20 -- 30.0
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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
__________________________________________________________________________________________________________________________________
1960 -- -- -- -- -- -- 31.5 10.3 25.2 4.73 3.28 2.25 --
1961 1.60 2.47 1.75 0.932 0.889 6.44 26.3 26.8 2.29 2.10 1.17 4.10 6.43
1962 3.22 3.53 1.76 1.21 1.69 2.68 60.9 104.8 54.4 57.3 3.38 7.28 25.3
1963 4.26 5.53 3.89 1.87 1.02 10.9 31.9 38.2 53.2 7.98 6.89 2.17 14.0
1964 1.97 2.12 1.35 1.22 1.37 2.32 50.1 22.4 12.7 4.45 1.58 5.67 8.89
1965 5.92 3.61 2.91 2.50 1.72 2.56 92.9 51.6 49.2 5.26 2.45 4.75 18.7
1966 10.2 5.15 4.84 4.18 2.76 37.5 118.2 33.6 6.83 4.33 18.7 2.94 20.8
1967 5.08 5.11 2.49 2.09 2.33 30.3 71.3 28.7 29.4 6.19 1.94 0.623 15.4
1968 1.15 1.71 4.58 2.76 0.393 14.2 22.4 10.6 23.9 7.62 1.82 2.62 7.80
1969 5.09 3.41 3.00 2.06 3.64 3.10 74.1 34.1 16.1 3.55 5.04 2.53 12.9
1970 12.4 10.0 5.79 4.59 4.33 4.66 85.8 38.5 25.7 3.96 1.41 1.56 16.5
1971 4.48 6.38 4.06 1.44 1.22 2.07 54.2 16.8 7.71 4.85 2.14 3.18 9.01
1972 34.7 31.4 8.23 6.61 4.79 17.8 74.1 29.9 9.50 11.8 8.38 2.54 19.9
1973 5.54 8.31 3.71 4.09 4.83 33.9 12.8 8.74 2.52 3.22 3.12 59.3 12.5
1974 28.9 8.30 11.5 8.99 7.38 5.81 85.2 43.9 12.3 2.87 3.20 2.15 18.4
1975 3.19 5.01 3.66 3.32 4.08 5.73 89.6 27.2 13.8 38.2 2.93 6.44 16.9
1976 5.13 6.51 4.11 3.55 3.58 18.5 35.2 5.42 2.60 2.14 1.09 0.694 7.35
1977 1.21 1.45 0.314 0.396 0.998 3.79 6.91 4.61 3.39 3.88 1.89 13.9 3.56
1978 13.1 13.7 13.6 5.25 2.80 3.99 91.7 10.9 5.61 5.23 2.70 3.78 14.3
1986 -- -- -- -- -- 28.8 48.8 35.0 7.89 6.62 2.73 2.99 --
1987 3.52 -- -- -- -- -- -- -- -- -- -- -- --
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