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Last update: Wednesday, 23-Feb-2005 09:46:15 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 369 1969 0.042 1940 56.3 67.4 1.20 2.13
November 213 1945 0.147 1941 36.6 43.8 1.20 1.38
December 91.8 1994 0 1941 17.6 21.3 1.21 0.67
January 51.2 1960 0 m 9.87 11.6 1.17 0.37
February 41.5 1945 0 m 8.03 9.63 1.20 0.30
March 804 1945 0 1940 106 179 1.69 4.01
April 3,700 1974 49.6 1977 985 960 0.97 37.3
May 4,670 1974 18.8 1940 748 935 1.25 28.4
June 1930 1974 2.83 1940 332 362 1.09 12.6
July 814 1970 0.735 1940 168 185 1.10 6.35
August 785 1944 0.103 1961 100 130 1.29 3.80
September 432 1944 0 1940 72.1 84.7 1.18 2.73
Annual 928 1974 9.77 1940 220 194 0.88 100
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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 0 0 10.9 40.0 16.4 2.20 0.54 0.16 0.17 0.28 0.10 0.20
90 0.19 0 0.25 29.6 64.3 33.2 6.83 1.70 0.96 1.60 2.80 1.70 1.70
85 0.94 0.19 1.20 61.5 81.0 47.4 16.5 4.24 3.17 2.70 4.57 2.10 2.99
80 1.60 0.43 1.60 92.1 98.8 65.5 27.6 8.43 4.44 9.30 6.70 2.60 4.74
75 2.10 0.97 3.17 131 134 85.8 36.5 18.3 8.65 16.1 9.43 4.29 7.01
70 2.10 1.50 3.71 170 166 108 44.9 26.2 18.7 19.0 11.7 5.41 10.5
65 2.70 2.20 4.42 208 199 132 53.6 37.7 27.4 22.8 14.2 6.39 15.3
60 3.67 2.70 5.68 254 240 158 63.8 46.6 34.3 28.1 17.2 7.05 20.6
55 4.23 2.70 7.87 322 299 186 76.7 55.1 41.0 33.2 20.2 8.28 28.1
50 4.97 3.40 9.23 408 386 216 94.3 63.4 47.5 38.0 23.3 10.4 37.2
45 6.16 4.66 11.7 538 486 250 115 72.5 53.9 42.6 26.5 12.6 47.9
40 8.48 5.60 14.5 665 580 287 139 81.9 60.2 47.9 30.0 14.3 63.5
35 10.3 7.03 18.1 800 681 329 164 93.2 71.3 53.6 34.0 16.2 82.2
30 11.9 8.34 23.1 958 793 371 190 108 83.2 61.0 38.8 18.5 111
25 13.6 10.8 31.0 1,180 912 431 221 127 96.7 70.9 45.9 21.5 155
20 16.1 14.1 57.0 1,500 1,090 492 258 152 110 83.6 55.3 24.7 219
15 19.9 16.9 121 2,030 1,360 595 318 185 137 100 66.7 28.4 322
10 26.9 22.3 243 2,810 1,940 740 412 236 172 131 80.4 42.0 550
5 39.0 31.1 720 3,980 2,810 1,110 639 339 243 197 127 74.6 1,010
______________________________________________________________________________________________________________________
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Probability of occurrence of annual high discharges
[ng, statistic not given]
_______________________________________________________________________________________________________________
Maximum Maximum mean discharge
instantaneous (ft3/s)
(ft3/s)
____________________ ________________________________________________________
Recurrence
Exceedance interval 1940-63 11964-94 3-day period 7-day period 15-day period 30-day period
probability (years)
_______________________________________________________________________________________________________________
0.99 1.01 201 111 87.0 72.0 60.1 44.6
0.95 1.05 414 282 208 175 144 110
0.90 1.11 605 454 326 276 225 174
0.80 1.25 950 798 556 472 381 300
0.50 2 2,220 2,240 1,490 1,260 1,000 809
0.20 5 5,040 5,910 3,790 3,180 2,480 2,050
0.10 10 7,680 9,590 6,060 5,040 3,900 3,240
0.04 25 12,000 15,800 9,860 8,100 6,220 5,210
0.02 50 15,800 21,600 13,400 10,900 8,330 7,000
0.01 100 20,400 28,400 17,600 14,200 10,800 9,070
0.005 200 25,500 36,400 22,500 17,900 13,500 11,400
0.002 500 33,600 48,800 ng ng ng ng
_______________________________________________________________________________________________________________
1Historic adjustment made to Log Pearson Type III peak frequency.
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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 0 0 0 0 0 0.036 0.375 0.589
0.10 10 0 0 0 0 0 0.332 0.405 1.02 1.62
0.20 5 0.153 0.156 0.184 0.271 0.427 0.922 1.56 2.55 4.54
0.50 2 1.99 2.05 2.25 2.47 3.06 3.64 6.88 8.66 18.8
_________________________________________________________________________________________________
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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 0 0 0 0 0 0 0 0.304
0.10 10 0 0 0 0 0 0 0 1.14
0.20 5 0.238 0.265 0.305 0.587 0.721 0.837 0.903 4.12
0.50 2 2.86 3.01 3.17 3.56 4.07 4.77 5.78 27.9
June-July-August September-October-November
______________________________ _______________________________
0.05 20 0.248 0.326 0.414 0.626 0.160 0.170 0.265 0.369
0.10 10 1.08 1.36 1.68 2.22 0.612 0.672 0.931 1.30
0.20 5 4.29 5.16 6.25 8.20 2.12 2.39 3.01 4.16
0.50 2 29.5 33.2 38.5 52.5 11.4 13.4 15.4 20.4
__________________________________________________________________________________________________
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Annual peak discharge and corresponding gage height
_____________________________________________________________________________________
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 19 5.52 1,000 1966 March 31 14.82 4,700
1941 April 10 11.03 3,200 1967 April 21 12.10 4,530
1942 April 5 12.45 5,000 1968 March 18 9.40 1,400
1943 June 3 6.15 1,420 1969 April 20 14.58 8,440
1944 August 4 6.28 1,470 1970 April 26 15.08 10,200
1945 March 26 9.20 3,020 1971 April 11 14.56 10,200
1946 March 19 9.24 2,900 1972 April 9 9.81 3,160
1947 April 3 5.83 1,280 1973 August 9 3.79 358
1948 April 19 14.94 7,280 1974 April 27 15.19 13,800
1949 April 19 13.18 5,840 1975 May 17 13.38 1,470
1950 April 18 19.20 20,400 1976 April 17 9.81 4,530
1951 April 5 8.22 2,310 1977 May 19 4.31 610
1952 March 31 7.28 700 1978 April 6 9.97 3,800
1953 June 3 4.48 642 1979 April 20 13.32 9,130
1954 July 6 5.45 1,160 1980 April 7 3.83 400
1955 April 2 10.75 3,400 1981 April 1 3.16 260
1956 April 25 12.89 5,990 1982 June 7 6.96 2,100
1957 March 23 6.22 725 1983 April 8 6.32 1,660
1958 April 6 6.52 500 1984 June 16 3.23 374
1959 April 3 7.90 2,000 1985 March 19 8.57 1,860
1960 April 12 12.50 5,690 1986 March 22 9.31 2,800
1961 April 9 3.46 334 1987 April 5 10.39 5,300
1962 April 19 11.74 5,110 1988 April 4 2.98 321
1963 July 26 7.72 2,340 1989 April 16 6.67 1,000
1964 June 19 5.43 796 1990 April 1 7.64 1,200
1965 April 11 12.68 4,960 1994 March 22 7.03 1,800
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 18 19.20 20,400 1955 April 2 10.75 3,400
1974 April 27 15.19 13,800 1941 April 10 11.03 3,200
1970 April 26 15.08 10,200 1972 April 9 9.81 3,160
1971 April 11 14.56 10,200 1945 March 26 9.20 3,020
1979 April 20 13.32 9,130 1946 March 19 9.24 2,900
1969 April 20 14.58 8,440 1986 March 22 9.31 2,800
1948 April 19 14.94 7,280 1963 July 26 7.72 2,340
1956 April 25 12.89 5,990 1951 April 5 8.22 2,310
1949 April 19 13.18 5,840 1982 June 7 6.96 2,100
1960 April 12 12.50 5,690 1959 April 3 7.90 2,000
1987 April 5 10.39 5,300 1985 March 19 8.57 1,860
1962 April 19 11.74 5,110 1994 March 22 7.03 1,800
1942 April 5 12.45 5,000 1983 April 8 6.32 1,660
1965 April 11 12.68 4,960 1944 August 4 6.28 1,470
1966 March 31 14.82 4,700 1975 May 17 13.38 1,470
1967 April 21 12.10 4,530 1943 June 3 6.15 1,420
1976 April 17 9.81 4,530 1968 March 18 9.40 1,400
1978 April 6 9.97 3,800 1947 April 3 5.83 1,280
1990 April 1 7.64 1,200 1977 May 19 4.31 610
1954 July 6 5.45 1,160 1958 April 6 6.52 500
1940 April 19 5.52 1,000 1980 April 7 3.83 400
1989 April 16 6.67 1,000 1984 June 16 3.23 374
1964 June 19 5.43 796 1973 August 9 3.79 358
1957 March 23 6.22 725 1961 April 9 3.46 334
1952 March 31 7.28 700 1988 April 4 2.98 321
1953 June 3 4.48 642 1981 April 1 3.16 260
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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]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1940 0.042 0.157 0.023 0 0 0 87.9 18.8 2.83 0.735 7.83 0 9.77
1941 0.106 0.147 0 0 0 0.045 1,006 346.6 143.2 39.0 21.5 143.3 140.9
1942 99.0 36.0 14.0 2.00 0.700 65.0 1,841 922.6 294.8 102.5 96.5 55.5 293.7
1943 42.0 29.6 8.58 4.79 5.00 141.9 499.1 284.5 291.8 213.6 203.2 174.7 158.5
1944 115.3 69.1 27.9 4.03 3.90 4.07 265.3 199.9 247.5 634.4 785.1 431.9 233.4
1945 181.0 213.0 89.3 41.9 41.5 803.7 1,006 691.6 372.9 224.6 118.2 80.0 323.2
1946 55.8 30.2 16.3 9.46 8.00 620.7 626.0 242.6 84.8 49.1 20.8 14.9 148.9
1947 21.5 20.1 9.32 4.87 2.78 12.1 565.3 257.9 170.4 67.9 128.2 55.7 109.5
1948 45.7 26.0 14.4 12.1 5.17 6.87 977.2 833.1 361.1 274.0 190.2 110.8 237.9
1949 60.9 37.3 19.3 16.5 9.21 5.61 2,703 1,409 602.3 230.8 119.8 58.3 438.3
1950 44.9 33.4 19.2 12.6 10.8 17.1 2,134 3,080 1,101 579.6 374.7 204.2 636.9
1951 129.1 74.8 26.1 24.7 21.6 81.4 816.5 470.2 256.0 104.1 53.5 31.4 174.1
1952 19.2 11.9 5.58 3.39 3.01 19.0 280.7 183.1 104.8 51.9 14.1 0.823 58.0
1953 0.581 3.22 1.11 0 0 1.87 65.5 50.6 148.2 76.6 49.5 8.35 33.8
1954 2.91 5.42 3.15 0.326 0.904 13.2 83.2 62.5 425.6 696.9 347.1 175.1 152.4
1955 114.2 61.9 27.3 15.2 16.6 22.7 1,584 763.3 511.1 247.4 75.0 39.0 289.2
1956 37.5 20.0 7.65 6.13 8.66 9.42 1,332 2,348 771.8 327.2 155.6 117.6 429.3
1957 91.4 51.3 10.1 6.74 1.07 170.7 260.3 175.0 108.4 44.2 67.2 114.0 92.0
1958 160.2 87.9 62.3 35.9 24.8 39.4 177.9 97.2 29.0 18.4 0.581 0.240 61.3
1959 0.352 2.48 2.12 1.01 0.325 47.2 416.1 125.2 91.9 20.5 9.92 3.43 59.8
1960 32.0 65.5 83.7 51.2 30.2 18.6 1,976 1,188 438.4 174.6 71.0 30.0 345.3
1961 17.9 7.83 2.56 2.06 0.079 49.7 249.7 142.4 37.0 2.07 0.103 0.143 42.6
1962 0.206 0.200 0.148 0 0 1.11 742.2 320.9 213.1 78.1 78.9 90.0 126.6
1963 47.3 26.2 16.5 8.65 0 64.7 134.7 180.7 241.3 160.4 100.5 54.9 86.7
1964 29.2 18.8 7.87 4.22 2.63 3.08 319.1 330.0 163.9 52.5 46.2 50.6 85.5
1965 29.9 18.4 11.2 3.88 2.50 2.04 849.2 738.0 429.1 154.4 72.7 93.7 200.4
1966 77.4 58.9 31.1 22.4 15.9 365.6 1,391 926.3 351.1 187.7 75.0 30.3 294.9
1967 16.0 10.6 6.66 7.65 7.36 110.9 947.8 975.1 285.1 81.5 24.3 6.40 207.1
1968 26.0 16.3 6.01 2.49 2.40 183.0 151.4 116.2 57.7 42.9 127.0 348.4 89.9
1969 369.4 173.6 42.3 23.7 14.0 20.6 3,596 1,632 561.2 319.9 147.9 96.8 582.0
1970 60.3 44.8 25.7 16.5 14.7 10.4 1,948 2,350 1,475 814.5 287.0 160.1 602.0
1971 94.5 66.7 21.4 13.2 10.1 12.0 2,731 1,590 587.8 353.2 262.3 141.4 489.9
1972 88.8 68.0 29.9 22.9 14.4 372.1 1,375 835.8 322.5 184.6 169.0 103.3 298.6
1973 62.0 37.8 6.98 2.74 2.85 97.1 84.5 68.5 36.7 58.8 64.8 65.7 49.3
1974 58.6 39.1 20.1 11.2 11.8 13.4 3,700 4,672 1,933 450.2 123.2 77.2 927.8
1975 53.8 34.3 18.4 9.76 5.44 7.28 357.3 1,172 585.4 241.1 91.5 44.1 219.7
1976 36.2 22.4 11.8 13.3 20.3 58.3 3,249 1,526 425.9 224.4 60.6 30.3 470.7
1977 17.9 9.86 2.72 2.50 2.82 21.2 49.6 77.9 37.2 10.6 2.66 15.9 21.0
1978 20.6 9.64 6.34 2.92 1.22 22.4 1,136 434.5 141.3 52.1 45.5 38.3 158.7
1979 17.5 11.4 4.92 4.00 3.55 4.05 2,155 3,182 758.4 227.6 54.6 44.7 541.2
1980 34.6 22.9 11.4 4.80 4.37 10.3 201.3 75.5 23.4 6.48 6.37 7.48 33.9
1981 14.0 18.3 3.49 .657 30.4 96.4 215.8 125.8 46.7 16.1 7.43 4.60 48.2
1982 9.29 8.27 3.48 .966 .303 66.1 626.2 663.0 500.1 225.5 109.4 56.5 189.4
1983 77.4 27.3 25.6 9.52 5.75 209.8 880.2 455.0 204.5 58.6 16.1 9.72 165.0
1984 15.9 11.0 6.91 3.73 4.07 40.0 89.5 86.0 110.7 18.1 4.32 3.88 32.8
1985 3.66 4.54 5.60 2.48 0.707 578.5 712.9 243.4 118.0 74.6 54.1 33.5 153.2
1986 43.8 30.3 14.7 11.2 4.91 488.7 880.4 728.0 364.8 160.1 108.3 56.7 241.9
1987 37.7 11.2 7.14 6.78 7.09 49.1 2,107 776.9 208.2 70.3 48.4 59.0 281.2
1988 53.2 31.3 18.4 1.37 0.345 44.4 88.7 40.8 9.42 3.06 1.15 2.49 24.6
1989 2.70 3.76 3.15 2.47 0.782 0.455 159.9 79.7 41.0 7.61 1.16 0.724 25.2
1990 2.82 2.83 1.87 2.45 1.94 21.1 336.6 98.5 164.1 38.4 3.89 1.35 56.0
1994 257.4 174.5 91.8 40.1 30.5 374.3 1,075 521.4 246.4 165.5 111.3 169.6 271.9
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