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Last update: Wednesday, 23-Feb-2005 09:45:47 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 224 1972 9.43 1977 31.7 34.9 1.10 3.67
November 209 1972 8.64 1956 27.1 28.4 1.05 3.14
December 48.7 1972 5.11 1964 16.9 9.18 0.54 1.96
January 30.1 1986 2.02 1962 12.4 5.96 0.48 1.44
February 46.8 1984 3.55 1962 12.2 6.80 0.56 1.42
March 385 1966 5.81 1948 74.2 91.8 1.24 8.60
April 946 1978 25.3 1981 343 285 0.83 39.7
May 1,160 1950 23.7 1958 117 163 1.39 13.6
June 596 1984 11.5 1980 95.6 105 1.10 11.1
July 376 1994 8.95 1980 67.5 75.8 1.12 7.82
August 426 1993 6.30 1961 38.2 67.3 1.76 4.42
September 124 1994 6.49 1955 27.1 25.2 0.93 3.14
Annual 204 1950 18.4 1977 71.3 43.1 0.60 100
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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 4.40 4.90 6.32 24.0 24.3 15.4 10.0 6.62 6.50 9.36 10.1 5.80 6.36
90 4.90 5.40 8.02 33.4 29.6 19.7 13.3 7.72 7.40 10.8 11.4 7.10 8.48
85 6.10 6.10 8.63 43.6 32.9 23.0 15.1 8.78 9.35 11.8 12.5 8.60 10.1
80 6.70 6.80 10.2 52.5 35.8 25.6 16.6 10.4 10.3 12.7 13.6 10.1 11.3
75 7.50 7.60 11.4 61.3 39.0 28.8 18.2 11.3 11.6 13.5 14.7 10.7 12.9
70 8.60 7.60 12.6 72.8 42.4 32.4 20.2 12.6 12.5 14.5 15.8 11.3 14.1
65 10.1 9.48 13.6 86.0 46.7 36.6 22.4 13.8 13.5 15.6 16.8 11.9 15.4
60 10.9 10.3 14.6 99.8 51.4 40.1 25.4 15.1 14.6 17.6 18.3 12.7 17.1
55 11.5 11.4 16.4 122 57.6 43.5 29.2 16.6 15.7 19.4 19.9 14.0 19.1
50 12.0 12.0 18.7 147 66.2 48.0 33.2 18.2 17.1 21.1 21.5 14.8 21.2
45 12.6 12.5 20.7 176 74.4 52.7 37.3 20.1 18.5 22.2 23.4 15.7 24.3
40 13.2 13.0 23.8 215 82.7 59.9 41.7 22.6 20.0 23.7 25.4 16.6 27.5
35 14.0 13.6 28.7 266 93.5 67.5 47.2 25.4 21.8 25.9 27.1 17.9 31.9
30 14.9 14.2 36.3 322 107 75.6 54.8 28.6 24.2 28.8 28.9 19.8 38.1
25 15.8 14.8 50.2 385 124 88.0 64.8 32.6 28.2 32.3 30.8 22.3 46.9
20 17.4 16.0 71.7 479 150 110 77.4 38.0 36.0 37.5 33.2 24.6 60.5
15 18.8 17.4 103 622 179 145 102 46.7 46.2 50.9 36.5 26.7 84.4
10 21.1 18.7 190 857 231 213 152 62.2 61.1 67.7 44.1 30.3 132
5 25.9 23.2 377 1,400 332 333 255 120 84.5 95.0 52.8 35.7 285
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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 1.01 106 73.3 60.1 45.7 34.4
0.95 1.05 218 158 128 95.7 69.6
0.90 1.11 314 233 188 140 99.9
0.80 1.25 481 369 296 217 153
0.50 2 1,040 847 673 482 328
0.20 5 2,120 1,830 1,440 1,010 670
0.10 10 3,010 2,660 2,110 1,450 951
0.04 25 4,290 3,920 3,100 2,100 1,360
0.02 50 5,350 4,980 3,930 2,640 1,700
0.01 100 6,490 6,140 4,850 3,220 2,070
0.005 200 7,700 7,400 5,850 3,850 2,460
0.002 500 9,420 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 2.55 2.68 2.88 3.22 3.71 4.56 5.37 6.52 8.13
0.10 10 3.30 3.48 3.70 4.05 4.60 5.45 6.30 7.46 9.13
0.20 5 4.40 4.65 4.90 5.24 5.86 6.71 7.64 8.84 10.7
0.50 2 7.12 7.46 7.79 8.09 8.84 9.75 11.0 12.4 15.0
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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 2.80 3.01 3.34 3.77 5.01 5.69 6.08 7.22
0.10 10 3.81 4.06 4.37 4.79 6.19 6.77 7.26 9.35
0.20 5 5.34 5.64 5.89 6.28 7.88 8.36 9.04 13.0
0.50 2 9.14 9.48 9.61 9.91 12.0 12.6 14.0 25.6
June-July-August September-October-November
_________________________ ___________________________
0.05 20 4.67 5.57 6.10 7.57 4.83 5.64 6.42 7.34
0.10 10 5.57 6.50 7.14 8.75 5.67 6.61 7.42 8.52
0.20 5 7.00 7.99 8.80 10.7 6.97 8.10 8.96 10.3
0.50 2 11.3 12.6 14.0 17.1 10.7 12.3 13.4 15.6
_____________________________________________________________________________________
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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
1943 April 7 10.48 941 1969 April 14 24.57 4,180
1944 August 18 -- 226 1970 April 16 13.64 1,980
1945 April 11 9.18 767 1971 April 8 13.60 1,460
1946 March 27 -- 675 1972 April 13 14.03 2,160
1947 April 19 13.28 1,840 1973 March 17 11.25 897
1948 April 14 -- 1,640 1974 April 16 15.87 1,890
1949 June 1 10.40 990 1975 April 20 19.24 2,550
1950 April 22 16.31 3,040 1976 April 2 13.60 1,390
1951 April 11 11.90 1,250 1977 May 31 -- 298
1952 April 12 9.52 544 1978 April 10 27.21 3,060
1953 March 29 -- 219 1979 April 20 -- 3,400
1954 June 15 -- 489 1980 April 5 10.10 879
1955 April 8 10.35 842 1981 May 24 7.20 362
1956 April 20 10.72 1,370 1982 April 15 10.00 820
1957 June 29 7.06 481 1983 June 14 11.00 1,230
1958 July 5 -- 168 1984 June 9 15.60 2,850
1959 April 2 7.64 310 1985 August 17 10.50 974
1960 April 6 8.80 460 1986 March 29 16.21 2,000
1961 March 25 4.86 140 1987 July 29 7.95 492
1962 July 8 11.70 1,570 1988 March 5 8.94 610
1963 April 7 6.34 300 1989 March 10 25.00 2,430
1964 April 17 9.40 730 1990 June 2 7.52 405
1965 April 14 17.81 4,560 1991 May 23 8.71 613
1966 April 2 17.33 4,220 1992 August 25 -- 312
1967 March 30 14.46 2,060 1993 August 3 16.13 1,320
1968 June 7 12.71 1,400 1994 July 8 12.67 1,660
Annual peak discharge, from highest to lowest, and corresponding gage height
1965 April 14 17.81 4,560 1962 July 8 11.70 1,570
1966 April 2 17.33 4,220 1971 April 8 13.60 1,460
1969 April 14 24.57 4,180 1968 June 7 12.71 1,400
1979 April 20 -- 3,400 1976 April 2 13.60 1,390
1978 April 10 27.21 3,060 1956 April 20 10.72 1,370
1950 April 22 16.31 3,040 1993 August 3 16.13 1,320
1984 June 9 15.60 2,850 1951 April 11 11.90 1,250
1975 April 20 19.24 2,550 1983 June 14 11.00 1,230
1989 March 10 25.00 2,430 1949 June 1 10.40 990
1972 April 13 14.03 2,160 1985 August 17 10.50 974
1967 March 30 14.46 2,060 1943 April 7 10.48 941
1986 March 29 16.27 2,000 1973 March 17 11.25 897
1970 April 16 13.64 1,980 1980 April 5 10.10 879
1974 April 16 15.87 1,890 1955 April 8 10.35 842
1947 April 19 13.28 1,840 1982 April 15 10.00 820
1994 July 8 12.67 1,660 1945 April 11 9.18 767
1948 April 14 -- 1,640 1964 April 17 9.40 730
1946 March 27 -- 675 1981 May 24 7.20 362
1991 May 23 8.71 613 1992 August 25 -- 312
1988 March 5 8.94 610 1959 April 2 7.64 310
1952 April 12 9.52 544 1963 April 7 6.34 300
1987 July 29 7.95 492 1977 May 31 -- 298
1954 June 15 -- 489 1944 August 18 -- 226
1957 June 29 7.06 481 1953 March 29 -- 219
1960 April 6 8.80 460 1958 July 5 -- 168
1990 June 2 7.52 405 1961 March 25 4.86 140
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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
__________________________________________________________________________________________________________________________________
1943 -- -- -- -- -- -- 307.4 117.5 234.9 66.2 33.4 19.5 --
1944 18.4 17.1 -- -- -- -- 63.8 58.7 58.3 98.0 125.3 72.6 --
1945 46.2 46.5 26.1 -- -- 181.0 294.9 145.0 97.5 41.7 30.5 45.4 --
1946 57.6 34.4 -- -- -- 145.3 225.2 74.6 42.4 32.3 12.9 18.7 --
1947 35.8 24.4 13.6 12.7 13.0 24.0 687.1 191.9 368.6 65.4 30.3 19.4 123.1
1948 19.3 18.6 11.3 8.74 6.45 5.81 511.0 75.9 34.7 33.8 22.3 12.7 62.8
1949 12.5 16.9 13.5 9.08 8.95 14.5 171.9 60.4 196.6 69.2 28.9 12.9 51.1
1950 24.0 27.5 18.0 11.0 7.00 9.90 818.5 1156 115.4 181.3 43.1 18.4 203.7
1951 32.5 21.8 16.0 14.0 12.0 10.8 428.7 131.5 44.6 20.3 18.4 25.6 64.4
1952 21.1 20.7 14.0 12.0 11.0 15.0 221.9 46.8 21.5 52.9 18.6 14.6 39.0
1953 18.8 20.7 13.3 7.90 10.8 68.4 99.2 65.9 80.3 49.7 28.6 16.3 40.1
1954 12.5 13.5 10.9 5.29 6.44 20.1 144.1 57.0 81.6 29.3 10.9 7.99 33.2
1955 10.8 12.9 8.32 6.81 7.36 7.42 150.2 31.5 34.4 15.6 12.4 6.49 25.2
1956 10.4 8.64 6.13 5.23 5.41 7.42 316.7 105.3 60.1 16.0 11.5 11.5 46.7
1957 13.6 20.4 10.4 8.52 7.54 48.6 120.3 41.1 118.6 130.5 23.6 52.0 49.6
1958 31.4 43.0 17.4 13.9 12.4 22.2 30.7 23.7 25.6 62.9 17.9 11.3 26.1
1959 12.9 17.5 7.24 4.81 3.84 36.9 78.6 68.2 27.5 16.5 14.3 7.89 24.8
1960 18.7 11.8 12.2 12.0 9.78 16.3 162.1 39.3 47.0 41.6 16.1 14.5 33.3
1961 11.8 16.2 8.38 6.71 7.28 64.3 52.8 41.7 13.3 10.2 6.30 9.83 20.8
1962 17.2 12.5 6.58 2.02 3.55 6.21 253.7 232.5 292.6 298.0 60.1 46.8 102.9
1963 36.0 32.4 17.4 9.25 4.94 37.4 94.4 47.2 57.5 33.4 12.1 10.6 32.8
1964 10.8 8.88 5.11 6.60 9.59 11.8 226.2 88.8 48.3 68.1 17.6 34.5 44.5
1965 24.8 19.6 11.5 10.8 8.34 10.6 916.7 135.5 126.0 54.9 25.4 30.7 113.7
1966 71.6 32.3 32.7 18.1 16.2 384.6 934.6 191.7 67.7 25.2 27.7 21.9 151.9
1967 18.9 12.3 10.5 12.5 14.3 90.0 340.9 102.4 73.0 26.5 12.7 12.1 60.3
1968 13.4 12.9 13.0 10.2 7.96 100.8 67.9 37.6 269.3 48.5 15.0 12.2 50.5
1969 21.0 19.4 12.6 4.70 5.64 7.50 669.0 129.7 103.2 50.0 20.4 24.8 88.4
1970 30.5 19.7 16.3 13.0 11.1 12.7 751.3 241.2 165.3 37.5 16.8 13.3 110.2
1971 25.0 30.4 11.3 11.6 12.5 43.3 345.1 61.3 36.5 17.3 10.5 33.2 52.8
1972 223.5 209.3 48.7 25.8 19.1 318.5 716.6 169.5 49.2 29.0 33.4 17.4 154.7
1973 22.5 32.7 12.7 11.0 12.2 228.1 51.1 37.5 22.5 12.2 12.6 80.3 44.9
1974 95.0 45.6 23.3 18.7 18.0 19.0 711.5 300.4 87.5 19.4 24.6 18.6 114.8
1975 18.5 33.9 17.0 11.9 13.7 23.5 756.1 220.8 48.9 182.3 35.3 18.6 114.8
1976 22.9 27.1 19.2 15.9 15.1 83.8 316.8 41.3 33.3 19.5 10.7 7.34 50.8
1977 9.43 10.2 8.91 7.86 8.18 18.9 51.6 32.6 40.6 10.9 6.96 15.4 18.4
1978 21.1 26.3 27.9 18.3 13.2 37.2 946.0 63.4 53.5 21.6 15.3 17.2 104.1
1979 13.6 14.8 13.3 12.1 12.9 17.2 868.9 160.5 71.1 166.0 45.2 17.8 117.3
1980 18.0 28.1 24.0 19.2 21.3 42.9 280.0 33.5 11.5 8.95 10.2 11.1 42.1
1981 15.4 15.3 9.56 8.05 12.2 32.8 25.3 50.7 38.8 24.3 17.1 34.5 23.7
1982 59.5 35.4 22.3 12.1 10.3 49.9 347.5 144.4 35.7 42.4 12.7 10.2 65.2
1983 81.8 27.5 26.9 19.2 19.0 333.9 181.4 54.7 228.1 113.2 49.4 72.0 101.0
1984 70.2 49.9 35.9 26.8 46.8 201.5 336.8 55.5 595.8 44.6 17.0 11.8 123.5
1985 -- -- -- -- -- -- -- -- 168.3 181.3 256.2 93.9 --
1986 88.1 47.0 38.1 30.1 22.9 217.4 579.4 269.1 69.5 82.9 26.8 21.2 124.6
1987 24.0 28.1 22.4 17.2 16.1 185.2 80.1 110.1 60.1 138.3 104.2 27.8 68.4
1988 26.5 27.2 24.5 20.3 16.4 126.4 209.1 37.1 36.4 13.8 9.88 14.0 46.7
1989 13.2 17.0 15.0 13.8 11.2 14.2 776.6 79.7 40.8 28.4 12.2 14.4 85.6
1990 14.9 14.5 7.08 8.58 11.3 59.7 88.6 39.3 58.9 16.8 8.05 7.73 27.9
1991 9.99 12.1 10.3 6.27 10.9 51.0 48.9 97.1 30.8 31.2 9.78 10.1 27.5
1992 12.9 10.7 10.0 10.5 14.1 80.2 53.9 36.3 20.4 28.3 53.3 84.9 34.6
1993 22.0 27.2 23.6 14.2 12.1 39.4 338.5 46.2 50.8 224.9 426.1 41.2 106.2
1994 22.7 21.6 25.2 17.4 14.0 52.5 221.7 105.3 175.0 375.5 63.7 123.6 101.9
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