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Statistics of monthly and annual mean discharge
__________________________________________________________________________________________________________
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
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October 150 1994 7.66 1957 49.2 42.8 0.87 2.51
November 195 1983 12.2 1991 66.2 50.2 0.76 3.38
December 191 1994 8.69 1991 64.0 48.0 0.75 3.27
January 140 1986 8.15 1991 59.9 39.3 0.66 3.06
February 202 1969 10.7 1991 72.6 53.6 0.74 3.71
March 1,330 1987 30.9 1990 294 325 1.11 15.0
April 2,550 1969 20.3 1991 606 598 0.99 31.0
May 1,990 1979 17.5 1959 261 359 1.38 13.3
June 555 1974 14.8 1961 157 139 0.88 8.03
July 1,420 1993 6.07 1973 160 273 1.70 8.18
August 1,940 1993 6.54 1961 103 314 3.05 5.26
September 561 1994 5.25 1959 65.5 113 1.72 3.34
Annual 437 1993 25.9 1991 163 117 0.72 100
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Monthly and annual flow duration, in cubic feet per second
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Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
______________________________________________________________________________________________________________________
95 14.1 14.6 20.2 21.4 17.3 14.6 5.62 5.36 6.45 7.57 14.5 12.6 10.3
90 15.8 16.3 26.6 29.3 21.6 20.3 10.1 7.52 9.72 11.2 18.2 16.0 14.7
85 19.9 18.2 42.3 37.7 25.0 25.4 14.3 9.86 12.0 13.9 20.9 20.7 17.7
80 23.5 23.1 49.6 50.3 30.8 32.2 17.3 11.8 13.6 16.2 23.6 26.5 21.0
75 28.3 30.9 61.9 65.7 38.4 38.6 20.0 14.1 15.5 18.4 26.6 32.0 24.5
70 33.5 39.1 73.8 85.1 48.7 45.3 22.9 15.8 17.6 20.2 29.8 36.6 28.1
65 37.5 42.6 82.6 112 57.0 52.9 25.7 17.5 19.7 22.0 33.3 40.2 33.8
60 43.2 45.8 94.3 140 75.4 60.9 30.0 19.5 21.7 23.9 37.2 43.6 39.5
55 47.6 50.6 111 209 108 69.9 35.6 21.4 23.8 26.2 41.7 46.9 46.1
50 51.5 57.9 132 316 134 79.5 43.9 23.4 25.8 29.4 46.8 50.4 53.2
45 55.2 64.3 153 396 162 89.9 52.4 26.3 28.8 32.5 52.1 54.2 60.4
40 61.1 69.6 190 487 193 106 61.0 29.8 31.9 35.7 58.1 58.0 73.4
35 68.3 79.9 229 601 231 130 78.0 35.2 36.4 43.9 65.1 64.1 88.2
30 75.6 91.9 264 748 273 162 97.3 44.6 42.0 53.5 78.0 72.0 109
25 87.7 100 305 927 336 194 135 56.9 49.4 65.8 96.3 87.9 131
20 106 112 381 1,140 434 240 172 73.9 59.9 82.1 110 108 171
15 123 130 506 1,380 515 288 230 107 76.8 104 133 129 232
10 134 167 902 1,820 661 378 367 166 123 142 151 153 360
5 150 254 1,500 2,490 901 508 600 352 305 195 243 189 661
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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 1.01 131 87.1 49.3 30.2 22.6
0.95 1.05 273 196 129 87.1 65.0
0.90 1.11 396 295 209 147 110
0.80 1.25 609 475 363 267 200
0.50 2 1,320 1,110 948 753 568
0.20 5 2,660 2,410 2,210 1,850 1,420
0.10 10 3,740 3,510 3,280 2,800 2,180
0.04 25 5,280 5,130 4,850 4,200 3,330
0.02 50 6,520 6,480 6,140 5,360 4,290
0.01 100 7,840 7,930 7,510 6,580 5,320
0.005 200 9,220 9,480 8,940 7,860 6,420
0.002 500 11,200 ng ng ng ng
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Probability of annual low discharges
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Minimum average 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)
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0.05 20 0.044 0.389 1.80 3.36 5.73 8.20 9.37 10.4 14.6
0.10 10 0.305 0.998 2.65 4.26 6.74 9.44 11.0 12.5 17.9
0.20 5 1.42 2.57 4.14 5.75 8.40 11.5 13.6 16.0 23.1
0.50 2 8.05 9.17 19.88 10.6 13.9 18.6 22.6 27.2 38.8
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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 4.80 8.51 9.60 11.6 8.25 10.1 11.4 14.8
0.10 10 7.76 11.6 13.0 15.6 11.4 13.9 16.1 22.9
0.20 5 13.1 16.6 18.4 22.0 16.9 20.5 24.4 38.1
0.50 2 30.3 32.1 34.9 40.6 35.2 43.3 54.7 94.3
June-July-August September-October-November
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0.05 20 1.58 2.47 3.68 5.52 0.224 2.77 4.88 8.26
0.10 10 2.42 3.47 4.81 7.11 0.837 4.10 6.41 10.0
0.20 5 3.85 5.33 6.86 10.0 2.99 6.43 8.98 12.9
0.50 2 9.54 12.7 15.0 21.6 13.9 14.3 17.5 22.2
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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
1957 September 7 5.20 612 1976 April 13 6.29 984
1958 April 7 -- 490 1977 May 5 7.35 1,230
1959 June 29 4.28 451 1978 March 23 11.73 1,410
1960 April 11 9.81 1,980 1979 May 2 17.58 4,880
1961 March 6 4.61 482 1980 March 23 7.01 760
1962 July 7 10.55 2,210 1981 April 5 4.30 460
1963 June 8 3.02 207 1982 April 13 11.44 2,600
1964 June 30 4.96 634 1983 March 17 13.75 2,370
1965 April 14 16.02 3,630 1984 April 6 9.79 2,000
1966 March 30 16.23 4,260 1985 May 19 5.13 642
1967 April 15 8.52 1,580 1986 April 21 10.75 2,110
1968 June 16 7.63 1,300 1987 March 23 14.07 3,000
1969 April 24 16.54 4,380 1988 March 26 3.63 284
1970 May 29 8.70 1,500 1989 April 4 8.36 1,000
1971 April 28 9.67 1,850 1990 June 4 3.74 311
1972 March 16 10.33 1,450 1991 July 2 3.49 261
1973 March 17 5.29 677 1992 March 11 9.18 1,500
1974 April 25 10.25 2,020 1993 August 2 16.34 3,790
1975 July 1 19.04 5,270 1994 April 5 10.70 1,980
Annual peak discharge, from highest to lowest, and corresponding gage height
1975 July 1 19.04 5,270 1972 March 16 10.33 1,450
1979 May 2 17.58 4,880 1978 March 23 11.73 1,410
1969 April 24 16.54 4,380 1968 June 16 7.63 1,300
1966 March 30 16.23 4,260 1977 May 5 7.35 1,230
1993 August 2 16.34 3,790 1989 April 4 8.36 1,000
1965 April 14 16.02 3,630 1976 April 13 6.29 984
1987 March 23 14.07 3,000 1980 March 23 7.01 760
1982 April 13 11.44 2,600 1973 March 17 5.29 677
1983 March 17 13.75 2,370 1985 May 19 5.13 642
1962 July 7 10.55 2,210 1964 June 30 4.96 634
1986 April 21 10.75 2,110 1957 September 7 5.20 612
1974 April 25 10.25 2,020 1958 April 7 -- 490
1984 April 6 9.79 2,000 1961 March 6 4.61 482
1960 April 11 9.81 1,980 1981 April 5 4.30 460
1994 April 5 10.70 1,980 1959 June 29 4.28 451
1971 April 28 9.67 1,850 1990 June 4 3.74 311
1967 April 15 8.52 1,580 1988 March 26 3.63 284
1970 May 29 8.70 1,500 1991 July 2 3.49 261
1992 March 11 9.18 1,500 1963 June 8 3.02 207
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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]
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Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
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1957 7.66 34.5 49.1 50.6 49.8 68.2 43.1 39.9 65.2 51.5 49.3 323.1 69.0
1958 109.4 133.9 80.9 70.7 95.6 116.0 98.8 38.4 27.6 72.3 17.2 12.9 72.7
1959 21.1 31.5 36.5 36.0 33.5 48.4 33.2 17.5 40.1 27.7 10.7 5.25 28.4
1960 16.0 12.7 26.0 19.5 21.9 175.3 838.4 100.0 171.8 35.7 21.0 13.9 120.1
1961 15.3 26.1 46.1 43.0 39.4 108.3 29.0 22.1 14.8 8.60 6.54 18.7 31.5
1962 21.1 18.5 13.0 13.2 14.8 246.6 469.4 210.6 277.4 657.0 91.6 39.9 173.8
1963 31.3 54.6 58.2 49.5 52.0 68.1 63.8 34.9 41.5 17.4 13.1 12.2 41.3
1964 11.7 25.9 36.6 25.8 26.2 19.8 78.9 30.4 159.2 203.4 22.9 33.7 56.2
1965 26.5 53.9 50.8 46.9 42.1 125.9 1,634 306.9 163.2 210.6 185.0 66.8 241.8
1966 120.5 97.9 105.8 103.7 76.8 1,304 991.4 358.9 217.9 149.0 219.6 71.9 319.8
1967 35.7 44.5 73.5 67.6 129.6 345.1 958.9 634.2 103.5 33.5 17.7 16.1 204.8
1968 18.3 29.1 42.6 37.4 41.3 128.1 168.3 163.5 329.2 47.7 17.5 21.8 86.8
1969 22.4 53.9 50.1 41.7 202.3 220.2 2,548 442.9 140.4 213.3 21.5 25.9 329.0
1970 22.1 47.5 58.5 65.5 100.9 231.1 523.1 401.7 446.5 68.2 17.7 17.2 166.2
1971 16.5 29.7 42.2 39.6 79.1 356.5 732.5 222.4 244.3 228.8 30.4 22.4 170.2
1972 56.6 106.6 158.6 138.2 78.6 363.5 927.8 289.4 235.5 39.8 24.9 19.2 202.6
1973 23.9 42.3 48.5 53.5 70.4 165.0 62.2 27.2 21.7 6.07 11.6 25.0 46.3
1974 22.4 32.8 34.7 63.7 177.9 283.8 1,006 685.7 555.4 20.1 16.6 10.1 241.2
1975 14.5 38.7 53.2 54.8 56.2 81.6 736.6 970.5 512.9 700.2 95.3 27.1 279.7
1976 38.1 62.7 92.7 93.7 107.0 169.3 601.5 172.3 51.6 21.3 10.7 29.9 120.3
1977 43.6 30.5 19.8 19.7 17.0 51.9 36.9 67.7 19.7 18.5 7.44 24.6 29.9
1978 23.9 40.6 48.3 55.3 98.8 426.8 806.5 180.5 79.2 42.2 22.2 61.5 156.7
1979 57.7 54.6 24.5 31.1 56.5 225.0 1,788 1,989 207.4 151.7 74.3 37.9 392.8
1980 73.7 180.4 22.7 15.9 15.9 209.4 246.9 18.9 34.8 28.4 15.8 158.9 84.7
1981 126.2 113.9 39.3 15.8 29.1 83.6 152.7 65.2 113.1 127.4 29.1 26.4 76.9
1982 140.6 167.6 18.2 14.0 15.6 189.9 1,244 297.5 171.3 184.6 72.7 13.7 210.4
1983 134.9 195.1 122.5 126.9 76.4 1,214 788.5 208.7 267.9 218.4 20.9 88.6 289.8
1984 106.9 137.3 136.3 109.4 76.0 415.7 1,092 382.0 109.8 35.0 16.4 32.5 220.2
1985 95.5 56.5 53.2 40.7 29.0 158.0 171.6 141.7 81.4 22.2 40.2 25.1 76.6
1986 36.2 100.2 143.0 139.9 193.7 354.3 509.8 490.0 81.8 72.4 90.2 34.0 187.1
1987 35.3 98.8 190.2 132.1 74.4 1,328 1,624 200.8 148.8 127.9 262.9 61.8 358.1
1988 89.8 102.4 112.7 118.3 139.4 145.6 38.0 54.1 34.6 6.52 18.2 13.5 72.7
1989 14.9 28.2 34.0 36.3 46.3 207.5 380.5 31.8 46.1 19.3 27.1 27.1 74.7
1990 32.5 27.4 17.5 21.5 16.8 30.9 28.7 18.6 60.3 20.8 23.9 55.8 29.5
1991 16.8 12.2 8.69 8.15 10.7 34.3 20.3 51.2 39.2 56.9 27.5 23.1 25.9
1992 15.9 24.2 60.6 70.1 63.6 585.1 134.4 70.6 56.1 97.1 46.1 52.2 107.0
1993 25.4 23.1 31.0 80.0 102.5 325.1 444.2 158.3 249.4 1424 1945 377.9 436.6
1994 150.3 147.3 190.7 125.7 202.1 565.5 988.3 304.4 354.8 624.4 276.0 560.8 374.1
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