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Last update: Wednesday, 23-Feb-2005 09:45:59 EST
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Statistics of monthly and annual mean discharges
[m, more than 1 year of occurrence]
__________________________________________________________________________________________________________
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 57.9 1983 1.52 1941 10.0 8.43 0.84 2.30
November 23.7 1983 2.03 1941 8.73 4.24 0.49 2.00
December 19.2 1983 2.06 1941 7.24 3.53 0.49 1.66
January 16.3 1986 2.70 1941 6.20 2.53 0.41 1.42
February 29.9 1981 1.21 1963 7.23 4.54 0.63 1.66
March 278 1966 4.07 1941 59.7 65.5 1.10 13.7
April 1,180 1950 9.46 1991 196 241 1.23 45.0
May 1,040 1950 7.07 1961 61.2 154 2.52 14.1
June 255 1964 2.74 1940 33.2 45.4 1.37 7.62
July 232 1982 3.34 m 24.9 42.8 1.72 5.72
August 280 1993 1.64 1945 12.5 37.4 2.98 2.88
September 53.3 1993 0.913 1940 8.81 7.62 0.87 2.02
Annual 193 1950 6.37 1990 36.7 31.6 0.86 100
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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 2.70 2.00 3.70 8.01 6.73 4.10 2.40 1.40 2.10 2.30 3.20 3.00 2.60
90 3.00 2.70 4.71 10.4 8.59 5.51 3.00 2.20 2.90 3.20 3.90 3.30 3.60
85 3.50 3.10 5.20 12.8 9.84 6.36 3.70 2.80 2.90 3.80 4.30 3.70 4.09
80 3.80 3.60 5.78 14.4 11.0 7.03 3.70 2.80 3.40 4.50 4.70 4.20 4.75
75 4.10 4.10 6.27 16.4 12.5 8.00 4.75 3.50 4.00 4.50 5.20 4.70 5.08
70 4.50 4.70 6.90 18.9 13.4 9.31 5.39 3.50 4.00 5.49 5.80 4.70 5.40
65 4.90 4.70 7.20 21.9 14.3 11.3 6.05 4.43 4.80 5.93 6.30 5.20 6.45
60 4.90 5.40 7.51 26.8 15.4 12.6 6.57 4.87 4.80 6.38 6.30 5.80 6.96
55 5.30 5.40 8.42 33.0 16.9 13.9 7.41 5.40 5.90 6.93 7.00 5.80 7.47
50 5.80 5.40 8.94 41.5 18.4 15.2 7.82 5.74 6.31 7.67 7.70 6.50 7.98
45 5.80 6.30 10.2 53.4 20.4 16.6 9.26 6.09 6.75 8.12 8.50 6.50 9.03
40 6.80 6.30 11.9 71.0 22.8 18.5 10.7 6.83 7.24 8.56 8.50 7.30 10.3
35 6.80 7.37 13.9 92.2 26.6 20.5 12.3 7.18 7.92 9.58 9.30 7.30 11.5
30 6.80 7.65 18.0 118 30.8 23.0 13.7 7.52 8.38 11.0 10.1 7.30 13.5
25 7.40 7.92 29.3 157 35.5 26.4 15.9 8.62 9.26 12.0 10.8 8.77 15.6
20 7.40 8.20 50.0 210 43.3 31.5 19.9 9.70 10.0 13.1 12.1 9.20 19.6
15 8.10 8.99 91.6 296 58.5 39.6 29.9 12.0 12.7 14.9 13.2 9.20 27.0
10 8.70 11.1 178 447 86.0 54.9 45.6 15.3 17.6 17.5 14.6 11.8 45.3
5 11.3 13.2 321 811 169 103 74.6 23.0 25.5 24.3 17.7 14.0 119
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Probability of occurrence of annual high discharges
[ng, statistic not given]
__________________________________________________________________________________________________
Maximum mean discharge
(ft3/s)
___________________________________________________________
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 15.3 11.2 9.91 7.79 7.30
0.95 1.05 58.6 41.4 33.6 25.5 20.0
0.90 1.11 114 78.6 61.1 45.4 33.3
0.80 1.25 244 162 121 87.3 59.7
0.50 2 908 559 387 265 168
0.20 5 2,850 1,590 1,040 675 424
0.10 10 4,850 2,570 1,650 1,030 660
0.04 25 8,160 4,060 2,550 1,540 1,030
0.02 50 11,100 5,320 3,310 1,960 1,340
0.01 100 14,500 6,660 4,110 2,380 1,690
0.005 200 18,200 8,080 4,950 2,820 2,070
0.002 500 23,600 ng ng ng ng
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Probability of occurrence of annual low discharges
____________________________________________________________________________________
Minimum mean discharge (ft3/s)
________________________________________________________________
Number of consecutive days
________________________________________________________________
Non- Recur-
exceed- rence
ance inter- 1 3 7 14 30 60 90 120 183
prob- val
ability (years)
____________________________________________________________________________________
0.05 20 0.524 0.657 0.930 1.08 1.46 1.99 2.43 2.78 3.18
0.10 10 0.848 0.994 1.28 1.45 1.88 2.44 2.92 3.33 3.76
0.20 5 1.36 1.50 1.78 2.01 2.48 3.08 3.61 4.09 4.61
0.50 2 2.73 2.85 3.06 3.43 3.96 4.63 5.28 5.94 6.74
____________________________________________________________________________________
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Probability of occurrence of seasonal low discharges
_____________________________________________________________________________________
Minimum mean discharge (ft3/s)
_________________________________________________________
Number of consecutive days
_________________________________________________________
Non- Recurrence
exceedance interval 1 7 14 30 1 7 14 30
probability (years)
_____________________________________________________________________________________
December-January-February March-April-May
_________________________ _________________________
0.05 20 1.58 1.65 1.77 2.12 2.75 3.28 3.57 5.12
0.10 10 1.99 2.09 2.22 2.61 3.26 3.79 4.12 5.85
0.20 5 2.58 2.72 2.87 3.31 4.01 4.54 4.96 7.15
0.50 2 4.01 4.22 4.42 4.93 5.92 6.54 7.38 12.0
June-July-August September-October-November
_________________________ _________________________
0.05 20 0.687 1.12 1.49 1.96 1.30 1.42 1.74 2.12
0.10 10 1.04 1.50 1.87 2.33 1.70 1.91 2.30 2.80
0.20 5 1.63 2.11 2.46 2.95 2.25 2.64 3.14 3.78
0.50 2 3.38 3.86 4.24 4.96 3.67 4.49 5.14 6.13
_____________________________________________________________________________________
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Annual peak discharge and corresponding gage height
[--, no data]
_____________________________________________________________________________________
Gage Peak Gage Peak
Water Date height discharge Water Date height discharge
year (feet) (ft3/s) year (feet) (ft3/s)
_____________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
1940 April 17 3.60 130 1968 March 8 4.48 500
1941 April 8 8.03 2,250 1969 April 11 8.80 3,290
1942 April 4 9.73 3,650 1970 April 8 7.68 2,380
1943 June 9 6.72 1,620 1971 April 8 8.39 2,800
1944 April 5 5.89 400 1972 April 14 6.43 1,500
1945 March 27 3.15 243 1973 June 17 3.56 384
1946 March 20 6.14 950 1974 May 20 9.86 5,050
1947 March 23 7.40 700 1975 April 12 5.68 1,270
1948 April 18 14.15 14,600 1976 March 29 5.46 1,100
1949 April 7 5.64 1,470 1977 July 14 2.43 100
1950 April 18 14.48 16,400 1978 April 6 5.50 1,200
1951 March 29 -- 500 1979 April 20 9.98 5,200
1952 July 2 3.94 825 1980 April 2 2.55 105
1953 May 30 2.04 130 1981 April 2 2.73 180
1954 June 15 4.29 1,020 1982 July 25 6.49 1,760
1955 March 31 8.46 3,000 1983 March 7 5.23 995
1956 June 6 8.14 3,370 1984 March 24 3.92 386
1957 March 22 3.53 356 1985 March 13 5.45 625
1958 July 4 1.87 17.0 1986 March 17 5.79 1,380
1959 April 4 2.91 321 1987 April 5 6.00 1,410
1960 April 7 7.55 2,810 1988 March 24 3.23 229
1961 March 19 2.69 65.0 1989 April 16 2.79 158
1962 April 6 7.69 2,600 1990 June 3 1.67 17.0
1963 July 8 3.67 590 1991 September 18 -- 77.0
1964 June 19 9.03 3,960 1992 March 7 -- 530
1965 April 11 10.22 4,730 1993 July 26 5.72 1,090
1966 March 21 7.14 1,580 1994 March 21 4.66 721
1967 March 30 7.40 2,030
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 18 14.48 16,400 1967 March 30 7.40 2,030
1948 April 18 14.15 14,600 1982 July 25 6.49 1,760
1979 April 20 9.98 5,200 1943 June 9 6.72 1,620
1974 May 20 9.86 5,050 1966 March 21 7.14 1,580
1965 April 11 10.22 4,730 1972 April 14 6.43 1,500
1964 June 19 9.03 3,960 1949 April 7 5.64 1,470
1942 April 4 9.73 3,650 1987 April 5 6.00 1,410
1956 June 6 8.14 3,370 1986 March 17 5.79 1,380
1969 April 11 8.80 3,290 1975 April 12 5.68 1,270
1955 March 31 8.46 3,000 1978 April 6 5.50 1,200
1960 April 7 7.55 2,810 1976 March 29 5.46 1,100
1971 April 8 8.39 2,800 1993 July 26 5.72 1,090
1962 April 6 7.69 2,600 1973 June 17 3.56 384
1970 April 8 7.68 2,380 1983 March 7 5.23 995
1941 April 8 8.03 2,250 1946 March 20 6.14 950
1952 July 2 3.94 825 1945 March 27 3.15 243
1994 March 21 4.66 721 1988 March 24 3.23 229
1947 March 23 7.40 700 1981 April 2 2.73 180
1985 March 13 5.45 625 1989 April 16 2.79 158
1963 July 8 3.67 590 1940 April 17 3.60 130
1992 March 7 -- 530 1953 May 30 2.04 130
1951 March 29 -- 500 1980 April 2 2.55 105
1968 March 8 4.48 500 1977 July 14 2.43 100
1944 April 5 5.89 400 1991 September 18 -- 77.0
1984 March 24 3.92 386 1961 March 19 2.69 65.0
1973 June 17 3.56 384 1958 July 4 1.87 17.0
1957 March 22 3.53 356 1990 June 3 1.67 17.0
1959 April 4 2.91 321
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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
__________________________________________________________________________________________________________________________
1940 -- -- -- -- -- -- 21.6 7.28 2.74 8.08 6.97 0.913 --
1941 1.52 2.03 2.06 2.70 2.91 4.07 462.8 9.71 22.6 3.34 2.55 12.0 43.5
1942 24.9 8.92 4.92 3.13 3.60 156.7 368.3 25.9 9.56 6.65 11.9 3.65 52.3
1943 2.70 2.91 3.05 3.26 3.78 133.7 41.0 14.1 154.2 144.9 10.4 5.33 43.5
1944 4.46 4.89 4.86 3.94 2.81 5.69 83.0 13.5 17.2 5.27 4.41 4.78 12.8
1945 2.83 8.53 6.50 3.71 4.92 82.6 20.3 11.5 8.79 3.91 1.64 2.82 13.3
1946 2.96 3.71 3.80 4.59 4.22 121.7 20.0 7.21 7.02 3.97 2.30 4.30 15.6
1947 4.59 4.25 4.24 3.21 2.17 65.5 41.6 9.00 7.45 5.89 3.41 3.52 13.0
1948 4.87 4.65 5.62 5.00 5.00 5.21 869.0 45.7 21.3 8.91 8.45 3.94 81.2
1949 4.30 5.17 3.79 3.00 3.00 4.81 334.0 17.8 7.61 11.0 5.13 3.58 33.3
1950 8.48 7.39 6.51 4.61 5.64 11.6 1,182 1,037 23.2 11.3 6.83 8.78 193.1
1951 8.29 8.67 8.35 7.77 7.29 57.0 104.0 13.8 10.5 5.23 6.74 5.80 20.3
1952 6.52 8.37 5.74 6.32 7.62 19.2 61.0 9.23 6.13 30.5 4.28 4.45 14.1
1953 4.67 5.74 5.17 4.92 6.00 7.59 9.59 17.4 17.8 6.26 3.67 4.49 7.77
1954 5.76 6.18 4.37 3.46 8.18 27.5 26.8 12.0 46.0 5.87 11.4 7.33 13.7
1955 5.78 6.75 6.48 4.93 5.11 92.8 166.1 14.7 64.1 5.59 3.88 3.98 31.6
1956 6.03 5.04 3.16 4.97 5.34 6.32 393.3 59.2 144.5 22.5 6.49 11.0 55.0
1957 11.4 12.5 7.13 5.29 6.43 50.3 14.0 14.5 11.9 5.91 6.48 13.5 13.3
1958 10.3 9.42 7.70 7.26 7.03 9.12 10.2 10.2 9.92 8.33 3.82 3.68 8.08
1959 6.31 5.72 4.79 4.40 5.37 20.5 66.9 14.4 7.29 3.76 2.40 3.39 12.1
1960 6.02 5.51 5.46 5.33 4.77 34.5 447.4 17.7 8.24 5.99 4.82 4.40 45.3
1961 3.92 6.59 6.15 4.01 3.64 24.1 12.3 7.07 4.26 3.81 2.69 3.51 6.87
1962 5.53 5.09 3.85 4.61 6.01 9.20 258.4 30.1 117.1 11.5 9.61 9.55 38.8
1963 11.0 11.3 8.03 4.01 1.21 21.8 14.9 12.6 27.8 29.2 4.74 3.38 12.6
1964 4.81 6.83 5.18 5.57 7.15 6.99 91.9 14.7 254.9 24.0 9.86 9.95 36.4
1965 9.83 8.42 5.88 6.05 7.57 8.87 369.6 39.3 41.5 15.7 8.52 21.4 44.8
1966 22.5 11.2 10.2 7.07 8.42 278.4 200.7 172.7 48.9 34.2 12.8 10.2 68.6
1967 11.9 13.5 17.8 12.8 10.9 132.3 184.4 180.3 24.1 11.0 6.27 6.38 51.2
1968 9.90 8.95 8.41 8.17 10.5 78.6 20.1 16.1 12.5 17.3 8.68 7.97 17.3
1969 8.91 9.86 7.07 6.86 8.31 10.0 434.1 40.9 22.6 10.5 5.72 6.67 47.2
1970 8.04 9.85 10.8 7.57 8.41 7.90 276.8 65.3 20.1 15.8 7.30 7.62 36.9
1971 14.2 11.6 8.76 7.25 9.02 16.1 460.0 38.3 21.7 71.5 14.4 10.7 56.6
1972 14.2 17.6 11.1 7.20 6.93 204.4 214.3 47.4 17.4 7.84 6.58 7.26 46.9
1973 7.97 8.89 5.57 9.15 10.0 46.2 14.4 15.7 25.0 4.93 4.24 6.01 13.2
1974 11.6 9.99 9.18 8.00 7.50 8.02 489.5 453.7 118.3 20.9 14.4 9.03 96.8
1975 12.4 13.7 10.6 8.11 7.58 16.4 250.7 69.0 16.8 70.8 6.12 6.61 40.7
1976 8.02 9.25 9.47 9.12 8.47 143.5 187.3 22.3 13.1 7.23 5.36 5.60 35.7
1977 4.04 4.62 7.36 8.04 6.11 14.3 14.0 14.2 6.66 9.17 3.22 11.5 8.62
1978 13.5 7.95 6.04 2.99 2.40 76.2 349.3 43.6 53.3 20.2 8.83 6.22 49.0
1979 7.91 6.68 5.49 5.85 7.28 9.61 776.9 321.3 32.5 22.4 7.88 21.5 101.7
1980 9.04 5.46 3.57 7.12 7.58 15.4 43.9 9.34 4.48 3.34 6.25 9.15 10.3
1981 9.84 13.5 6.21 4.98 29.9 37.5 33.5 15.9 14.8 9.85 9.78 16.2 16.7
1982 14.5 9.92 8.01 3.94 3.72 79.9 198.7 37.5 60.8 232.2 52.6 7.56 59.5
1983 57.9 23.7 19.2 10.1 18.5 168.2 143.4 31.1 20.4 20.6 11.8 18.5 45.4
1984 10.6 9.86 4.69 7.32 16.4 63.2 58.5 24.6 19.2 9.00 5.22 8.62 19.7
1985 6.25 6.27 5.99 6.59 4.47 119.0 38.0 24.6 20.1 4.85 5.70 12.9 21.4
1986 19.9 21.9 18.4 16.3 9.03 197.1 58.9 43.0 23.5 70.5 15.4 12.6 42.6
1987 16.0 11.2 8.79 9.61 12.1 114.5 489.4 50.8 24.0 31.5 9.44 10.7 65.4
1988 9.74 9.50 8.91 7.48 11.9 41.3 43.0 21.6 15.3 3.58 1.99 10.8 15.4
1989 17.9 5.77 6.72 6.99 4.64 5.78 56.7 27.0 12.7 7.72 4.30 5.54 13.5
1990 8.88 8.23 6.80 4.90 4.44 4.90 12.6 8.79 7.87 4.72 1.82 2.50 6.37
1991 3.15 4.11 4.90 4.28 5.55 7.29 9.46 10.9 6.74 18.5 3.93 14.1 7.74
1992 9.45 13.3 8.53 6.99 10.5 156.3 42.6 16.1 8.30 8.55 4.74 4.99 24.3
1993 4.89 7.10 7.46 6.29 4.91 17.4 65.2 18.4 28.0 176.7 279.9 53.3 56.4
1994 20.9 13.4 12.1 7.83 8.44 164.4 120.6 42.7 74.7 47.8 11.5 10.4 44.8
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