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Last update: Tuesday, 31-Aug-2004 10:28:53 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 16.6 1966 1.52 1993 4.16 3.31 0.80 0.81
November 13.3 1958 1.49 1961 4.12 2.76 0.67 0.80
December 5.87 1958 1.32 1961 2.97 1.24 0.42 0.58
January 4.05 1976 1.21 1969 2.37 0.69 0.29 0.46
February 11.9 1976 1.30 1969 2.94 2.05 0.70 0.57
March 622 1966 2.10 1969 113 157 1.39 22.0
April 1,230 1969 2.06 1991 207 273 1.32 40.3
May 191 1970 2.19 1992 40.4 48.8 1.21 7.88
June 424 1975 2.26 1988 39.3 87.1 2.22 7.65
July 874 1993 1.44 1961 64.6 168 2.60 12.6
August 506 1993 1.33 1961 23.5 83.4 3.55 4.58
September 111 1994 1.28 1984 9.27 19.5 2.10 1.81
Annual 165 1993 2.14 1990 43.1 40.6 0.94 100
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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
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95 1.40 1.40 1.50 2.30 2.10 1.30 1.30 1.30 1.30 1.50 1.60 1.20 1.40
90 1.60 1.40 2.00 2.90 2.60 2.10 1.70 1.30 1.60 1.70 1.90 1.60 1.40
85 1.70 1.60 2.00 4.67 3.20 2.10 1.70 1.70 1.60 1.70 1.90 1.60 1.90
80 1.80 1.80 2.00 6.48 3.80 2.80 2.20 1.70 1.60 1.90 2.10 1.80 1.90
75 1.80 1.80 2.00 11.0 5.00 2.80 2.20 1.70 2.00 2.10 2.30 1.80 1.90
70 1.90 1.80 2.92 16.9 5.91 4.08 2.90 2.10 2.00 2.10 2.30 2.10 1.90
65 2.00 1.80 3.33 21.4 7.29 4.64 2.90 2.10 2.00 2.30 2.50 2.10 1.90
60 2.00 1.80 3.77 27.3 9.05 5.23 2.90 2.10 2.40 2.50 2.50 2.10 2.84
55 2.10 1.80 4.54 37.5 11.6 6.24 4.04 2.60 2.40 2.50 2.50 2.40 3.11
50 2.20 2.10 5.78 51.2 14.1 6.85 4.89 2.60 2.40 2.80 2.80 2.40 3.38
45 2.20 2.10 8.33 69.2 17.8 8.94 5.70 2.60 2.40 2.80 3.10 2.40 3.79
40 2.20 2.40 13.2 92.7 22.5 11.2 7.07 3.20 3.00 3.10 3.40 2.70 4.32
35 2.40 2.40 21.6 121 26.6 13.5 10.9 3.20 3.60 3.40 3.70 2.70 5.56
30 2.50 2.40 34.6 150 32.5 15.5 15.1 4.84 3.60 4.10 4.10 3.10 7.16
25 2.70 2.70 56.3 195 41.7 18.0 20.5 5.90 5.40 4.50 4.90 3.60 10.7
20 2.80 2.70 96.3 268 54.5 23.9 26.9 8.53 6.97 4.90 5.40 3.60 16.8
15 3.00 3.10 169 384 73.5 33.2 44.8 14.2 8.79 5.90 5.90 4.10 28.7
10 3.30 3.90 347 533 102 53.7 91.4 23.6 16.0 7.80 7.80 4.70 61.8
5 4.00 4.50 731 806 170 116 289 71.4 31.3 13.3 11.0 6.20 179
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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 11.8 3.88 2.67 1.98 1.58
0.95 1.05 44.3 20.8 15.4 11.3 8.40
0.90 1.11 85.9 46.7 35.6 25.9 18.7
0.80 1.25 184 115 89.9 64.8 45.2
0.50 2 700 514 410 290 192
0.20 5 2,300 1,730 1,370 947 602
0.10 10 4,040 2,950 2,290 1,570 981
0.04 25 7,080 4,830 3,660 2,470 1,530
0.02 50 9,950 6,400 4,760 3,190 1,960
0.01 100 13,300 8,040 5,870 3,910 2,390
0.005 200 17,200 9,730 6,970 4,610 2,810
0.002 500 23,000 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 0.44 0.48 0.92 1.14 1.27 1.33 1.41 1.49 1.54
0.10 10 0.69 0.77 1.06 1.24 1.36 1.45 1.55 1.65 1.70
0.20 5 1.06 1.17 1.24 1.37 1.49 1.62 1.76 1.88 1.97
0.50 2 1.72 1.81 1.65 1.72 1.84 2.03 2.28 2.52 2.78
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Probability of seasonal low discharges
[ng, statistic not given]
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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 ng 1.05 1.27 1.34 0.58 1.49 11.52 1.70
0.10 10 ng 1.20 1.36 1.44 0.97 1.61 1.65 2.30
0.20 5 ng 1.40 1.50 1.59 1.54 1.82 2.00 3.41
0.50 2 ng 1.85 1.87 1.98 2.50 2.53 3.35 8.00
June-July-August September-October-November
_________________________ ___________________________
0.05 20 0.88 1.09 1.20 1.37 0.94 1.18 1.30 1.41
0.10 10 1.02 1.22 1.30 1.50 1.06 1.29 1.42 1.54
0.20 5 1.25 1.43 1.51 1.78 1.25 1.47 1.60 1.75
0.50 2 1.96 2.16 2.32 3.04 1.84 2.05 2.23 2.48
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1Graphical interpretation.
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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
1956 June 7 4.15 92.0 1976 March 23 5.72 246
1957 August 13 4.89 150 1977 July 5 5.32 208
1958 April 6 5.34 202 1978 March 24 10.19 2,350
1959 November 18 3.03 34.0 1979 April 20 11.50 3,200
1960 April 8 7.26 621 1980 March 19 6.07 250
1961 March 4 3.78 39.0 1981 July 14 5.84 172
1962 August 11 9.54 1,630 1982 April 2 11.72 3,400
1963 April 6 5.85 280 1983 June 23 12.23 2,930
1964 June 9 5.32 209 1984 March 28 10.95 2,590
1965 April 12 11.05 3,390 1985 May 12 6.39 357
1966 March 18 10.39 2,100 1986 March 24 8.48 1,090
1967 April 23 7.31 702 1987 March 22 10.41 2,220
1968 June 19 6.05 325 1988 March 9 7.84 302
1969 April 11 13.55 5,750 1989 March 31 8.42 981
1970 May 29 11.06 3,260 1990 June 2 3.37 15.0
1971 March 24 5.58 207 1991 May 27 5.25 178
1972 March 18 7.48 742 1992 March 10 7.32 710
1973 March 17 9.03 1,400 1993 July 17 12.72 3,770
1974 April 14 7.22 594 1994 March 22 11.50 3,040
1975 June 30 15.41 7,610
Annual peak discharge, from highest to lowest, and corresponding gage height
1975 June 30 15.41 7,610 1960 April 8 7.26 621
1969 April 11 13.55 5,750 1974 April 14 7.22 594
1993 July 17 12.72 3,770 1985 May 12 6.39 357
1982 April 2 11.72 3,400 1968 June 19 6.05 325
1965 April 12 11.05 3,390 1988 March 9 7.84 302
1970 May 29 11.06 3,260 1963 April 6 5.85 280
1979 April 20 11.50 3,200 1980 March 19 6.07 250
1994 March 22 11.50 3,040 1976 March 23 5.72 246
1983 June 23 12.23 2,930 1964 June 9 5.32 209
1984 March 28 10.95 2,590 1977 July 5 5.32 208
1978 March 24 10.19 2,350 1971 March 24 5.58 207
1987 March 22 10.41 2,220 1958 April 6 5.34 202
1966 March 18 10.39 2,100 1991 May 27 5.25 178
1962 August 11 9.54 1,630 1981 July 14 5.84 172
1973 March 17 9.03 1,400 1957 August 13 4.89 150
1986 March 24 8.48 1,090 1956 June 7 4.15 92.0
1989 March 31 8.42 981 1961 March 4 3.78 39.0
1972 March 18 7.48 742 1959 November 18 3.03 34.0
1992 March 10 7.32 710 1990 June 2 3.37 15.0
1967 April 23 7.31 702
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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
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1956 -- -- -- -- -- -- -- -- 11.2 1.79 4.37 6.35 --
1957 2.55 3.09 2.35 2.02 1.92 3.06 5.87 3.46 6.64 9.44 13.7 28.1 6.85
1958 7.94 13.3 5.87 2.74 9.18 25.7 45.8 5.22 10.4 15.8 2.73 2.31 12.2
1959 2.15 3.26 3.00 2.03 2.15 3.51 2.59 2.55 2.76 3.38 2.13 1.95 2.62
1960 3.05 2.42 2.02 1.72 1.97 47.6 200.6 7.58 4.04 2.66 1.75 1.76 22.9
1961 1.59 1.49 1.32 1.37 1.45 10.6 5.33 4.74 1.41 1.44 1.33 1.46 2.81
1962 2.08 1.73 1.72 1.75 1.60 59.6 257.3 49.0 45.5 404.0 152.0 23.1 84.0
1963 11.3 10.2 4.94 2.64 3.06 4.99 50.1 12.5 14.9 3.02 2.61 2.30 10.2
1964 2.15 2.31 1.88 2.17 2.06 3.44 24.7 14.3 15.4 14.8 4.24 3.62 7.58
1965 3.36 3.50 2.75 2.75 2.81 3.78 750.0 38.8 26.3 33.4 48.5 17.0 77.0
1966 16.6 11.2 5.84 2.46 2.20 622.2 238.6 70.5 15.4 10.3 8.65 6.58 85.1
1967 3.67 3.17 2.73 2.44 2.06 46.8 229.6 108.6 7.19 3.62 1.59 1.92 34.4
1968 2.47 2.26 2.12 1.97 2.74 36.3 20.0 12.2 102.6 17.3 7.64 2.82 17.5
1969 2.45 2.74 2.26 1.21 1.30 2.10 1,231 29.9 19.7 78.2 12.2 16.2 115.4
1970 5.34 4.00 2.82 2.15 1.85 16.9 258.1 191.1 160.8 22.1 3.26 6.00 56.1
1971 3.65 4.94 2.99 2.20 1.87 51.1 45.1 14.1 17.9 24.7 3.32 2.41 14.6
1972 7.42 8.65 4.97 3.60 4.54 183.3 156.0 59.6 43.6 6.95 21.8 11.1 42.7
1973 4.57 5.14 4.34 4.02 4.68 215.2 27.1 6.38 3.41 1.71 2.49 3.52 23.9
1974 3.98 2.77 2.44 3.61 2.80 4.30 200.6 82.1 21.4 3.29 2.85 3.16 27.7
1975 3.73 2.74 2.68 2.36 1.85 10.1 487.4 146.7 423.7 477.2 10.5 7.01 131.3
1976 5.95 6.51 4.25 4.05 11.9 63.0 50.2 7.66 3.48 3.19 3.33 3.98 13.9
1977 2.36 2.81 2.56 2.67 3.00 5.54 7.40 20.6 8.46 9.53 2.37 3.49 5.93
1978 4.38 6.92 4.44 3.06 3.20 348.5 272.1 22.7 16.5 18.0 3.31 2.74 59.1
1979 3.24 2.60 2.45 2.37 2.64 4.00 888.1 177.0 14.0 4.37 3.04 3.43 91.5
1980 3.05 3.67 2.95 2.64 2.56 37.3 72.0 5.90 4.42 3.78 2.97 2.80 12.0
1981 2.87 2.63 3.39 1.86 2.82 2.41 3.28 3.34 3.98 14.0 2.84 2.82 3.87
1982 3.36 2.43 2.46 2.09 1.71 35.1 674.2 32.6 10.8 3.88 2.56 2.00 63.8
1983 3.97 4.99 4.19 2.37 3.98 330.8 114.9 22.4 341.7 195.1 5.74 3.47 86.5
1984 2.86 3.76 2.61 2.15 2.82 319.8 314.0 27.0 4.04 2.95 1.89 1.28 57.1
1985 2.29 3.00 1.48 1.59 1.64 37.0 11.5 63.5 11.8 4.15 2.02 2.53 12.0
1986 2.59 3.28 2.40 1.89 1.91 229.6 256.6 102.7 7.55 7.94 8.09 5.85 52.8
1987 5.84 6.02 4.28 2.97 3.06 493.9 172.7 55.7 15.0 2.49 2.02 1.75 64.5
1988 2.02 2.62 2.19 1.88 3.98 97.6 36.9 4.16 2.26 1.92 2.31 2.07 13.4
1989 1.88 2.05 1.94 2.26 2.04 109.9 270.3 10.4 2.31 2.07 2.88 1.73 34.0
1990 2.27 2.38 1.53 1.67 1.39 2.58 2.74 2.39 2.72 1.63 1.92 2.51 2.14
1991 2.19 2.16 1.75 1.70 1.87 2.90 2.06 24.6 23.8 9.68 2.05 1.64 6.39
1992 1.56 1.69 1.61 1.96 4.74 238.7 13.5 2.19 4.31 56.5 3.77 2.49 28.1
1993 1.52 1.94 2.35 2.07 1.70 161.0 253.6 14.8 80.9 874.5 506.5 55.2 165.0
1994 13.7 6.07 4.98 3.55 2.78 419.5 202.4 78.3 18.9 170.2 49.2 111.1 90.8
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