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Last update: Tuesday, 31-Aug-2004 10:28:41 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 73.2 1983 1.16 1953 12.7 15.3 1.20 1.93
November 50.3 1981 1.28 1961 11.4 9.54 0.84 1.73
December 29.6 1983 0.765 1961 6.98 5.69 0.82 1.06
January 26.3 1983 0.474 1990 4.77 4.47 0.94 0.72
February 154 1981 0.754 1990 9.80 24.1 2.46 1.49
March 793 1983 1.46 1964 118 175 1.48 17.9
April 1,420 1950 15.8 1977 268 291 1.09 40.7
May 854 1950 10.4 1990 98.2 148 1.51 14.9
June 326 1954 1.75 1961 53.4 61.5 1.15 8.10
July 299 1993 0.356 1989 40.7 58.7 1.44 6.17
August 423 1993 0.090 1961 23.8 63.8 2.68 3.61
September 63.0 1957 0.707 1961 11.5 14.4 1.25 1.75
Annual 204 1950 5.31 1977 54.9 40.0 0.73 100
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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
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95 0.89 0.94 1.10 14.9 10.9 2.00 0.55 0.25 0.52 0.95 1.60 0.91 0.72
90 1.20 1.20 1.50 20.3 15.6 4.41 0.94 0.52 0.84 0.95 2.10 2.00 1.10
85 1.40 1.40 2.40 24.7 18.3 6.72 1.60 0.74 0.84 1.30 2.70 2.00 1.60
80 1.90 1.40 2.40 29.4 21.0 9.77 2.70 1.10 1.10 1.80 3.50 2.80 2.45
75 1.90 1.80 4.01 34.5 23.6 12.2 4.18 1.50 1.30 2.10 4.00 2.80 3.08
70 2.30 1.80 4.49 40.0 26.1 14.5 5.35 1.50 1.30 2.50 4.00 3.30 3.71
65 2.30 2.20 4.97 46.6 29.7 16.7 6.71 2.20 1.70 2.90 5.30 3.80 4.18
60 2.70 2.20 5.94 56.0 33.9 19.4 9.02 2.20 2.10 3.40 6.10 3.80 5.62
55 3.10 2.70 7.18 72.0 38.0 22.4 11.9 3.69 2.70 4.00 7.55 4.50 6.81
50 3.10 2.70 11.6 88.8 43.0 26.3 14.5 4.75 3.40 4.70 8.31 4.50 9.04
45 3.60 3.40 19.4 111 50.0 31.3 17.0 5.42 5.08 7.01 9.10 5.20 11.9
40 3.60 3.40 27.3 139 59.8 38.0 19.8 7.84 6.38 8.51 11.1 5.20 15.0
35 4.20 4.28 39.5 169 72.7 45.8 22.9 10.7 7.80 11.2 12.6 6.68 19.1
30 4.90 4.74 58.2 203 84.8 54.9 28.4 14.0 11.4 13.7 13.9 7.63 23.6
25 4.90 5.36 79.8 243 98.5 65.7 34.4 17.5 14.0 16.3 16.2 8.86 31.7
20 6.86 6.74 108 329 118 77.1 42.3 22.7 17.0 20.6 18.1 10.6 43.6
15 8.24 8.13 158 465 138 89.4 58.9 31.8 21.2 27.5 20.2 13.0 64.6
10 9.82 9.99 351 698 180 116 88.8 46.9 28.9 34.4 22.6 15.3 104
5 12.6 17.9 775 1,320 301 198 162 77.4 43.6 49.1 33.2 18.8 217
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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)
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0.99 1.01 32.8 22.8 16.8 13.1 12.1
0.95 1.05 92.4 70.5 55.7 42.8 34.4
0.90 1.11 154 123 99.9 75.9 57.5
0.80 1.25 278 230 192 144 103
0.50 2 771 674 580 421 275
0.20 5 1,880 1,680 1,450 1,020 631
0.10 10 2,840 2,560 2,180 1,500 920
0.04 25 4,260 3,830 3,210 2,160 1,320
0.02 50 5,440 4,860 4,020 2,660 1,630
0.01 100 6,680 5,930 4,840 3,160 1,950
0.005 200 7,990 7,030 5,650 3,640 2,260
0.002 500 9,800 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)
________________________________________________________________________________________
0.05 20 0.004 0.005 0.086 0.202 0.340 0.545 0.733 0.933 1.29
0.10 10 0.076 0.090 0.207 0.354 0.526 0.746 0.987 1.29 1.75
0.20 5 0.263 0.303 0.458 0.618 0.833 1.10 1.43 1.91 2.56
0.50 2 1.11 1.24 1.37 1.52 1.87 2.35 3.00 4.06 5.38
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Probability of seasonal low discharges
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Minimum average 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 0.594 0.723 0.794 0.865 0.865 0.987 1.24 2.89
0.10 10 0.803 0.944 1.03 1.12 1.12 1.33 1.70 4.52
0.20 5 1.15 1.30 1.40 1.54 1.58 1.95 2.57 7.70
0.50 2 2.23 2.40 2.56 2.87 3.38 4.42 6.15 20.5
June-July-August September-October-November
_____________________________ ____________________________
0.05 20 0.044 0.097 0.202 0.328 0.060 0.276 0.425 0.581
0.10 10 0.144 0.252 0.423 0.642 0.229 0.451 0.625 0.860
0.20 5 0.429 0.634 0.896 1.37 0.487 0.773 1.01 1.39
0.50 2 2.00 2.57 3.11 4.88 1.63 2.11 2.64 3.60
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Annual peak discharge and corresponding gage height, period of record
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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 17 7.45 3,800 1973 March 13 3.10 170
1951 April 11 5.01 1,240 1974 May 24 6.14 2,030
1952 April 8 4.17 737 1975 April 21 6.16 1,800
1953 July 3 3.08 204 1976 March 31 4.70 1,090
1954 June 19 4.38 878 1977 May 5 2.64 66.0
1955 April 3 5.04 1,330 1978 April 5 6.10 1,440
1956 April 18 7.83 4,250 1979 April 25 7.34 2,600
1957 September 5 3.17 249 1980 April 3 3.81 560
1958 March 3 4.04 666 1981 February 24 4.01 594
1959 March 21 2.83 153 1982 April 4 5.38 1,420
1960 April 7 5.57 1,450 1983 March 12 5.51 1,480
1961 March 26 2.55 81.0 1984 March 28 4.78 1,030
1962 April 1 3.50 436 1985 March 17 3.76 579
1963 June 25 2.68 116 1986 March 19 5.16 1,000
1964 April 9 3.13 247 1987 April 5 6.00 1,730
1965 April 12 4.64 1,000 1988 March 25 2.88 151
1966 March 19 7.63 3,100 1989 April 7 4.02 710
1967 March 31 5.24 1,340 1990 June 5 2.52 66.0
1968 March 12 3.10 211 1991 July 2 2.71 119
1969 April 14 7.51 4,660 1992 March 7 4.53 960
1970 April 10 3.52 445 1993 August 1 6.00 1,470
1971 April 12 6.55 2,360 1994 March 27 5.21 1,170
1972 March 21 5.08 1,360
Annual peak discharge, from highest to lowest, and corresponding gage height
1969 April 14 7.51 4,660 1965 April 12 4.64 1,000
1956 April 18 7.83 4,250 1986 March 19 5.16 1,000
1950 April 17 7.45 3,800 1992 March 7 4.53 960
1966 March 19 7.63 3,100 1954 June 19 4.38 878
1979 April 25 7.34 2,600 1952 April 8 4.17 737
1971 April 12 6.55 2,360 1989 April 7 4.02 710
1974 May 24 6.14 2,030 1958 March 3 4.04 666
1975 April 21 6.16 1,800 1981 February 24 4.01 594
1987 April 5 6.00 1,730 1985 March 17 3.76 579
1983 March 12 5.51 1,480 1980 April 3 3.81 560
1993 August 1 6.00 1,470 1970 April 10 3.52 445
1960 April 7 5.57 1,450 1962 April 1 3.50 436
1978 April 5 6.10 1,440 1957 September 5 3.17 249
1982 April 4 5.38 1,420 1964 April 9 3.13 247
1972 March 21 5.08 1,360 1968 March 12 3.10 211
1967 March 31 5.24 1,340 1953 July 3 3.08 204
1955 April 3 5.04 1,330 1973 March 13 3.10 170
1951 April 11 5.01 1,240 1959 March 21 2.83 153
1994 March 27 5.21 1,170 1988 March 25 2.88 151
1976 March 31 4.70 1,090 1991 July 2 2.71 119
1984 March 28 4.78 1,030 1963 June 25 2.68 116
1961 March 26 2.55 81.0 1990 June 5 2.52 66.0
1977 May 5 2.64 66.0
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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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1950 7.90 8.87 4.05 1.50 1.50 12.3 1,421 854.0 98.8 30.0 8.23 6.08 204.2
1951 12.0 11.1 8.23 10.6 6.68 21.7 440.3 90.5 70.1 21.5 2.68 11.6 58.5
1952 7.77 8.87 6.74 2.03 3.24 6.23 283.8 43.4 6.13 44.9 3.55 1.37 34.6
1953 1.16 7.97 2.61 2.35 2.57 13.3 38.5 60.3 61.2 64.4 3.06 2.07 21.7
1954 1.55 2.83 3.45 3.61 34.8 79.0 64.1 30.9 325.6 170.0 48.3 38.3 66.7
1955 33.5 18.5 9.06 3.14 2.43 40.4 332.5 65.4 77.5 23.6 4.48 2.11 50.8
1956 2.62 2.37 2.07 1.51 1.88 2.19 631.3 100.2 189.4 19.0 3.93 9.56 79.5
1957 6.05 23.8 6.84 2.62 1.30 43.3 51.3 36.4 21.1 24.5 25.8 63.0 25.5
1958 31.1 18.1 10.1 9.23 8.21 38.7 62.1 20.9 16.0 61.5 4.84 1.42 23.6
1959 3.05 5.23 4.63 3.20 2.49 48.6 35.2 23.9 8.92 2.57 1.11 0.803 11.7
1960 8.11 11.0 4.18 2.81 1.82 21.7 391.7 97.4 63.4 12.6 4.46 1.04 51.2
1961 1.53 1.28 0.765 0.723 0.961 23.2 31.5 13.7 1.75 1.45 0.090 0.707 6.49
1962 1.56 2.38 2.10 1.56 1.30 23.1 123.4 59.4 84.4 22.7 15.8 6.60 28.6
1963 6.10 6.30 4.62 2.14 1.52 17.1 32.0 22.4 23.0 6.95 3.57 1.71 10.6
1964 1.17 1.86 1.05 1.07 1.26 1.46 88.6 32.8 58.2 24.0 5.39 11.7 18.9
1965 16.3 8.65 5.90 2.04 3.06 12.3 270.8 38.7 17.0 123.1 57.2 24.2 48.3
1966 43.0 12.9 9.60 3.27 2.20 650.5 136.5 88.8 28.4 51.1 18.4 6.66 88.8
1967 9.65 6.52 4.13 3.64 4.74 197.2 211.5 139.8 29.5 10.4 1.43 1.57 51.9
1968 3.26 3.84 2.53 2.25 2.54 91.3 26.9 31.4 13.1 5.65 5.87 12.6 16.9
1969 6.81 4.83 3.83 2.58 2.17 2.37 1,022 85.0 26.7 24.2 24.0 5.85 99.9
1970 3.01 4.66 4.86 3.64 3.57 14.6 178.9 107.6 58.7 13.4 27.6 4.80 35.4
1971 3.84 8.10 4.27 3.18 2.10 4.61 674.7 66.6 163.6 79.6 6.85 18.3 85.6
1972 32.4 24.2 9.09 4.11 3.09 325.9 151.4 78.1 34.3 2.88 1.96 1.92 56.1
1973 3.77 8.83 3.42 2.39 1.88 72.9 25.5 20.1 6.66 1.56 1.88 3.25 12.8
1974 8.02 4.85 4.24 2.25 2.48 15.3 464.3 488.9 89.1 9.75 0.901 0.889 91.1
1975 3.73 11.8 5.70 5.95 5.75 51.6 561.2 369.5 67.5 45.4 6.38 8.07 95.2
1976 7.12 10.7 5.98 5.21 11.0 297.5 280.1 64.5 18.5 3.58 1.23 1.55 59.0
1977 1.97 2.19 2.68 3.32 3.42 15.4 15.8 12.5 2.24 1.07 1.18 1.70 5.31
1978 3.29 3.89 4.66 4.37 2.38 30.5 348.2 21.5 15.3 13.9 12.2 2.51 38.3
1979 2.74 8.97 4.39 7.09 4.76 5.79 701.3 288.9 56.2 117.4 52.0 8.30 104.7
1980 8.11 12.7 7.22 4.66 4.41 26.3 175.6 21.7 36.0 5.57 21.6 42.0 30.2
1981 41.7 50.3 19.6 12.3 153.6 165.3 71.6 53.7 135.2 40.5 19.7 28.0 65.2
1982 25.1 20.6 15.1 5.85 3.91 153.6 608.6 134.1 92.1 159.3 42.2 11.0 106.0
1983 73.2 33.9 29.6 26.3 55.9 793.0 309.2 105.1 45.2 21.4 5.46 8.40 126.4
1984 26.7 18.8 6.97 4.30 26.6 247.7 266.5 190.4 44.3 4.24 2.48 1.93 70.2
1985 8.53 8.64 5.91 3.65 4.09 249.9 39.8 29.4 29.0 7.01 80.3 44.6 43.0
1986 43.5 26.5 12.6 8.45 7.79 423.4 250.7 132.8 14.5 22.3 32.2 28.3 84.3
1987 18.5 18.7 19.3 13.1 16.1 215.7 545.1 52.8 18.7 142.0 60.2 16.9 94.8
1988 18.3 17.8 15.6 5.71 7.99 65.2 49.0 24.7 11.5 0.691 0.774 2.65 18.4
1989 2.50 4.02 3.62 3.88 3.50 4.44 186.5 23.1 4.74 0.356 0.398 0.763 19.6
1990 1.26 3.59 1.50 0.474 0.754 5.44 24.9 10.4 26.7 8.57 3.64 2.12 7.42
1991 2.38 11.1 3.77 1.64 2.64 10.5 17.0 34.5 23.8 31.9 14.6 22.1 14.7
1992 14.0 13.4 9.10 7.33 13.7 346.1 39.0 22.3 4.85 1.71 0.555 0.838 39.8
1993 1.32 3.08 4.08 3.00 2.96 82.5 182.1 49.6 20.7 299.2 423.4 37.8 93.6
1994 12.7 13.7 14.3 10.7 9.85 339.9 198.8 78.9 163.2 53.3 10.4 11.5 76.8
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