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Last update: Tuesday, 24-Aug-2004 12:38:27 EDT
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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 470 1972 1.02 1991 48.4 82.0 1.70 5.48
November 232 1972 1.11 1977 31.2 38.8 1.25 3.53
December 56.6 1978 0.050 1977 14.3 11.4 0.79 1.62
January 26.2 1997 0.002 1977 8.95 6.72 0.75 1.01
February 25.8 1984 0 1977 8.38 6.35 0.76 0.95
March 243 1995 0.190 1964 72.9 70.8 0.97 8.26
April 904 1996 29.5 1991 312 251 0.80 35.4
May 622 1962 10.5 1980 134 122 0.91 15.2
June 657 1962 8.20 1980 89.1 113 1.27 10.1
July 442 1962 1.99 1961 85.2 107 1.25 9.66
August 350 1985 1.17 1961 40.0 72.5 1.82 4.53
September 330 1973 0 1990 38.0 60.4 1.59 4.30
Annual 177 1962 18.2 1990 73.5 40.8 0.56 100
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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 0.19 0 0.18 22.8 11.3 5.73 2.30 0.58 0.23 1.30 1.50 0.96 0.66
90 0.64 0.18 1.60 29.2 18.1 8.45 4.23 0.83 0.71 1.90 2.50 2.20 2.46
85 1.70 0.67 3.78 37.6 23.7 11.4 5.63 1.70 1.60 3.63 6.89 2.80 3.71
80 2.20 2.10 7.15 48.3 29.6 14.0 7.46 2.71 2.90 4.96 8.48 4.19 5.88
75 2.20 2.60 8.18 61.4 35.3 16.6 10.3 3.78 4.49 7.22 10.1 5.02 7.67
70 3.52 3.10 9.21 78.3 41.7 19.6 13.2 4.36 5.68 9.20 12.3 5.62 9.24
65 4.73 5.44 10.4 93.8 49.8 23.6 16.2 6.04 7.77 11.2 14.7 7.13 11.3
60 5.49 6.74 12.2 108 61.8 27.8 18.9 7.61 9.71 14.7 17.5 8.31 13.5
55 6.79 7.53 13.9 125 72.1 32.2 21.6 9.57 11.6 17.6 20.0 9.82 16.4
50 7.92 8.24 16.4 143 82.1 36.6 25.3 12.1 14.0 20.0 22.4 12.6 19.1
45 9.47 8.50 18.8 170 91.9 41.7 30.2 14.4 16.4 22.3 24.9 14.6 22.2
40 10.3 8.76 21.7 204 103 49.7 36.5 17.1 19.1 25.8 27.7 16.3 26.8
35 11.1 9.78 27.7 243 118 62.2 44.5 20.4 22.6 31.7 30.5 18.0 32.6
30 12.5 10.6 39.5 296 137 76.3 56.0 24.2 26.6 38.7 33.7 19.7 41.2
25 13.5 11.4 60.9 367 161 96.7 73.3 29.5 32.6 46.9 37.0 21.3 56.1
20 14.5 14.4 95.1 449 187 117 104 37.4 41.6 60.3 41.4 22.9 79.0
15 16.3 15.8 140 552 225 145 150 52.2 57.0 76.1 47.6 25.3 114
10 18.9 17.3 209 786 288 198 222 81.7 91.5 106 58.7 29.0 172
5 23.7 20.1 334 1,310 451 366 401 144 158 175 80.5 35.5 316
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Probability of annual high discharges
[ng, statistic not given]
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Maximum average 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 ng 106 93.3 66.0 49.9
0.95 1.05 318 216 176 124 91.9
0.90 1.11 437 307 243 171 125
0.80 1.25 632 460 354 249 179
0.50 2 1,200 928 693 484 339
0.20 5 2,130 1,710 1,280 889 606
0.10 10 2,800 2,280 1,720 1,190 803
0.04 25 3,660 3,020 2,320 1,610 1,070
0.02 50 4,310 3,580 2,800 1,930 1,270
0.01 100 4,950 4,130 3,280 2,270 1,470
0.005 200 5,590 4,680 3,780 2,610 1,680
0.002 500 6,430 ng ng ng ng
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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
1950 April 21 18.39 2,790 1979 April 20 14.63 2,140
1961 April 23 14.34 279 1980 April 3 9.95 670
1962 May 24 18.72 1,490 1981 September 8 12.98 1,560
1963 June 4 15.13 355 1982 April 16 12.04 1,320
1964 April 16 16.07 472 1983 March 7 13.29 520
1965 April 12 11.12 1,780 1984 June 9 9.13 626
1966 April 2 12.60 2,240 1985 August 18 15.03 2,320
1967 March 31 14.17 2,880 1986 March 30 13.50 1,720
1968 July 17 7.35 551 1987 July 24 9.00 661
1969 April 11 14.91 3,210 1988 April 4 9.68 620
1970 April 25 12.76 2,300 1989 April 6 13.57 940
1971 April 8 12.34 1,430 1990 June 21 5.89 134
1972 April 15 13.98 2,070 1991 September 10 6.60 247
1973 September 4 11.27 1,030 1992 March 9 12.33 500
1974 August 15 12.91 2,270 1993 March 30 12.47 1,000
1975 April 19 14.66 2,120 1994 July 8 -- 1,270
1976 March 31 11.70 920 1995 March 14 13.05 900
1977 July 3 9.40 855 1996 April 20 16.89 2,790
1978 April 9 16.64 3,140 1997 April 15 14.54 2,030
Annual peak discharge, from highest to lowest, and corresponding gage height
1969 April 11 14.91 3,210 1994 July 8 -- 1,270
1978 April 9 16.64 3,140 1973 September 4 11.27 1,030
1967 March 31 14.17 2,880 1993 March 30 12.47 1,000
1950 April 21 18.39 2,790 1989 April 6 13.57 940
1996 April 20 16.89 2,790 1976 March 31 11.70 920
1985 August 18 15.03 2,320 1995 March 14 13.05 900
1970 April 25 12.76 2,300 1977 July 3 9.40 855
1974 August 15 12.91 2,270 1980 April 3 9.95 670
1966 April 2 12.60 2,240 1987 July 24 9.00 661
1979 April 20 14.63 2,140 1984 June 9 9.13 626
1975 April 19 14.66 2,120 1988 April 4 9.68 620
1972 April 15 13.98 2,070 1968 July 17 7.35 551
1997 April 15 14.54 2,030 1983 March 7 13.29 520
1965 April 12 11.12 1,780 1992 March 9 12.33 500
1986 March 30 13.50 1,720 1964 April 16 16.07 472
1981 September 8 12.98 1,560 1963 June 4 15.13 355
1962 May 24 18.72 1,490 1961 April 23 14.34 279
1971 April 8 12.34 1,430 1991 September 10 6.60 247
1982 April 16 12.04 1,320 1990 June 21 5.89 134
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1Gage height recorded using datum 8 feet higher.
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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]
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Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1960 -- -- -- -- -- -- 172.2 65.6 198.0 79.2 1.85 1.52 --
1961 2.93 8.82 7.31 1.81 0.389 32.5 109.6 68.3 10.6 1.99 1.17 16.6 21.8
1962 14.6 13.5 4.64 2.70 1.99 8.03 265.3 622.0 656.9 442.3 39.3 45.4 177.1
1963 18.8 24.0 12.7 2.37 0.104 32.0 147.7 87.2 141.2 41.8 4.44 7.08 43.2
1964 2.71 1.81 1.25 0.203 0.048 0.190 223.5 127.6 94.2 22.3 4.48 39.7 42.9
1965 30.1 18.3 5.28 5.11 3.34 2.88 537.9 237.1 249.9 40.1 8.43 18.2 95.9
1966 65.8 35.8 22.6 6.50 2.70 80.6 744.8 210.5 39.9 9.46 31.3 11.4 104.8
1967 9.29 9.87 6.16 6.72 8.95 142.1 345.9 175.0 98.7 23.2 2.99 1.27 69.2
1968 2.50 2.94 4.39 1.35 0.276 133.8 120.1 57.5 91.8 124.5 6.92 13.4 46.8
1969 22.1 14.3 10.9 8.91 10.8 9.34 590.5 153.2 66.8 26.3 36.0 19.0 80.3
1970 77.2 55.7 21.2 12.2 9.57 11.6 571.1 235.0 134.2 8.78 3.14 7.46 95.2
1971 21.2 44.3 14.4 7.47 7.76 28.0 342.6 62.0 25.4 22.5 21.2 57.1 54.2
1972 470.0 231.8 31.2 12.2 9.28 165.0 502.5 217.1 45.7 32.8 30.4 18.7 147.4
1973 20.4 22.3 5.21 4.11 7.63 179.3 66.4 42.5 9.82 7.55 31.2 330.3 60.5
1974 146.5 43.6 20.9 16.1 16.9 20.4 677.2 270.7 66.3 8.68 281.4 17.4 132.4
1975 24.5 34.8 18.1 14.4 15.0 20.4 677.4 217.8 80.2 275.3 14.1 5.22 116.4
1976 7.71 12.7 2.49 2.69 5.70 77.3 186.5 21.9 19.6 20.0 8.42 0.826 30.4
1977 2.22 1.11 0.050 0.002 0 15.5 48.9 16.7 17.0 75.4 6.93 83.5 22.3
1978 73.7 74.3 56.6 16.6 7.54 21.9 726.3 64.7 25.3 22.9 10.9 15.4 92.4
1979 7.71 6.40 4.11 2.09 2.87 19.5 677.9 132.5 94.0 148.1 72.5 8.54 97.7
1980 16.8 22.2 13.4 11.2 10.0 12.4 213.7 10.5 8.20 3.49 7.34 8.43 27.8
1981 12.9 19.7 3.26 2.75 8.70 26.4 29.6 16.9 23.3 60.0 72.9 171.1 37.3
1982 -- -- -- -- -- 45.8 512.5 272.0 36.8 98.0 10.3 3.16 --
1983 82.9 22.5 15.4 11.1 11.7 164.4 97.2 71.6 113.6 66.9 28.9 19.2 59.1
1984 51.1 32.2 17.8 14.0 25.8 78.2 103.4 22.0 113.0 14.6 2.30 1.74 39.5
1985 86.4 55.9 11.8 5.44 5.55 164.8 148.0 239.0 130.6 204.8 350.5 61.9 123.3
1986 100.8 33.9 27.6 19.8 16.0 241.6 370.4 190.0 22.5 16.0 7.10 14.6 88.7
1987 12.4 9.27 8.34 7.51 8.77 175.2 45.8 137.4 26.8 105.9 32.9 17.3 49.6
1988 17.2 35.4 19.3 14.5 6.94 76.9 189.3 24.0 12.3 4.44 2.59 2.26 33.6
1989 3.86 8.45 8.74 8.69 8.00 13.7 369.0 66.9 60.0 33.7 2.12 6.65 48.8
1990 3.82 10.0 4.61 2.70 2.91 39.8 46.7 24.7 54.3 18.7 9.51 0 18.2
1991 1.02 1.77 1.05 0.246 0.684 20.0 29.5 73.2 27.9 85.1 17.9 67.5 27.3
1992 24.7 21.3 22.7 17.2 15.9 113.8 83.9 39.8 12.9 29.4 65.0 90.8 44.9
1993 20.4 33.1 18.9 11.3 9.32 116.9 160.0 52.5 101.7 204.7 154.7 57.1 78.8
1994 34.5 24.6 18.1 11.9 11.2 123.1 130.3 111.1 163.9 364.3 50.8 67.7 93.3
1995 76.3 54.0 20.9 11.3 9.63 243.2 118.2 140.9 19.5 159.2 36.7 93.3 82.6
1996 143.4 51.9 23.5 23.0 18.7 19.7 904.0 381.5 68.8 42.6 24.9 15.5 142.5
1997 32.5 29.3 30.3 26.2 21.1 19.5 583.0 120.3 223.4 294.6 24.6 26.4 119.0
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