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Last update: Tuesday, 31-Aug-2004 10:28:44 EDT
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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 29.8 1958 0.473 1992 4.33 5.30 1.23 2.15
November 20.5 1958 0.380 1960 3.86 3.45 0.90 1.92
December 7.42 1958 0.155 1959 2.16 1.73 0.80 1.07
January 5.38 1994 0 m 0.930 1.07 1.15 0.46
February 5.37 1983 0 m 1.34 1.61 1.20 0.67
March 270 1987 0.587 1964 47.8 63.9 1.34 23.7
April 654 1979 2.44 1981 85.7 131 1.53 42.6
May 82.0 1979 1.71 1981 16.9 16.0 0.94 8.39
June 50.6 1970 0.907 1961 11.8 11.7 0.99 5.87
July 273 1993 0.021 1989 14.5 43.7 3.01 7.21
August 133 1993 0.076 1984 5.97 21.1 3.53 2.96
September 58.5 1957 0.094 1984 6.07 13.2 2.18 3.01
Annual 62.4 1979 1.52 1981 16.8 15.8 0.94 100
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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 0.08 2.10 1.70 0.75 0.08 0.02 0.10 0.37 0.88 0.09 0.05
90 0 0 0.11 3.40 2.40 1.20 0.22 0.12 0.19 0.63 1.20 0.26 0.15
85 0 0 0.45 5.76 3.40 1.50 0.44 0.31 0.34 1.00 1.40 0.50 0.33
80 0.09 0.07 0.89 6.35 4.00 1.80 0.61 0.58 0.61 1.00 1.70 0.77 0.70
75 0.11 0.10 1.20 7.92 4.80 2.90 0.86 0.58 0.82 1.40 2.00 0.77 1.00
70 0.20 0.12 1.80 9.18 6.14 3.60 1.20 0.80 0.82 1.80 2.00 0.96 1.00
65 0.20 0.20 2.55 12.3 6.91 3.60 1.70 0.80 1.10 1.80 2.00 1.20 1.50
60 0.27 0.20 3.06 15.1 8.11 4.93 2.40 1.10 1.10 2.30 2.40 1.20 1.50
55 0.37 0.26 3.62 18.0 8.92 5.66 2.90 1.10 1.50 2.30 2.40 1.50 2.31
50 0.51 0.34 4.41 21.2 10.9 6.42 3.39 1.50 1.50 2.30 2.80 1.50 2.74
45 0.70 0.56 6.67 24.7 12.9 7.66 3.94 1.50 2.00 3.00 2.80 1.80 3.17
40 0.82 0.72 8.37 30.4 14.8 9.36 5.00 1.50 2.00 3.00 3.40 1.80 3.76
35 0.82 0.92 13.2 39.2 17.2 10.8 6.15 2.00 2.60 3.00 3.40 1.80 4.26
30 1.10 1.20 18.9 49.5 20.2 12.7 7.55 2.00 2.60 4.16 4.00 2.30 5.98
25 1.30 1.50 27.5 64.4 22.6 14.5 10.1 3.44 3.64 4.54 4.00 2.80 7.78
20 1.50 1.50 43.0 84.2 25.6 16.7 12.5 4.14 4.27 5.28 4.70 2.80 11.5
15 1.80 2.00 64.2 119 29.2 20.8 17.3 5.27 5.42 6.53 5.85 3.50 16.5
10 2.10 3.73 125 176 35.9 26.7 23.5 7.17 9.50 8.70 6.65 4.53 26.3
5 2.90 5.08 281 331 48.3 38.4 41.5 14.6 26.2 14.9 8.70 5.92 54.6
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Probability of annual high discharges
[ng, statistic not given]
__________________________________________________________________________________________________
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)
__________________________________________________________________________________________________
0.99 1.01 8.30 3.56 3.04 2.54 2.43
0.95 1.05 24.1 12.2 10.4 8.48 7.10
0.90 1.11 42.1 22.9 19.4 15.6 12.3
0.80 1.25 81.6 47.9 40.1 31.4 23.1
0.50 2 279 182 148 110 72.4
0.20 5 912 626 489 338 206
0.10 10 1,660 1,150 876 581 342
0.04 25 3,110 2,150 1,580 1,000 573
0.02 50 4,620 3,160 2,280 1,390 787
0.01 100 6,570 4,430 3,130 1,860 1,040
0.005 200 9,030 5,990 4,140 2,390 1,330
0.002 500 13,200 ng ng ng ng
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Probability of annual low discharges
__________________________________________________________________________________________
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 0 0 0 0 0 0.064 0.285 0.594
0.10 10 0 0 0 0 0 0 0.115 0.395 0.727
0.20 5 0 0 0 0 0.020 0.094 0.224 0.581 0.946
0.50 2 0.072 0.078 0.097 0.131 0.200 0.371 0.682 1.18 1.67
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Probability of seasonal low discharges
_____________________________________________________________________________________________
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 0 0 0 0 0 0 1.13
0.10 10 0 0 0 0 0 0.037 0.228 1.69
0.20 5 0 0 0 0.032 0.129 0.179 0.553 2.72
0.50 2 0.129 0.156 0.208 0.292 0.645 0.985 2.08 6.62
June-July-August September-October-November
____________________________ ____________________________
0.05 20 0 0 0 0.070 0 0 0.028 0.224
0.10 10 0 0 0.046 0.164 0.024 0.052 0.095 0.359
0.20 5 0.064 0.096 0.167 0.368 0.094 0.181 0.277 0.619
0.50 2 0.568 0.722 0.926 1.32 0.594 0.930 1.23 1.64
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Annual peak discharge and corresponding gage height, period of record
_____________________________________________________________________________________
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 April 12 6.75 767 1976 March 24 6.39 400
1957 September 3 5.07 248 1977 March 15 3.18 25.0
1958 October 25 3.31 56.0 1978 March 30 6.93 560
1959 March 14 4.42 30.0 1979 April 19 17.78 9,000
1960 April 5 6.00 370 1980 March 30 8.15 100
1961 March 2 3.60 40.0 1981 February 17 4.65 28.0
1962 March 28 6.84 390 1982 March 30 8.70 580
1963 April 6 3.47 24.0 1983 March 7 9.95 650
1964 June 19 3.65 60.0 1984 March 27 9.16 755
1965 April 12 9.23 1,780 1985 March 10 5.50 88.0
1966 March 13 8.69 880 1986 March 20 6.51 210
1967 March 27 6.90 650 1987 April 3 8.99 960
1968 June 8 4.46 210 1988 March 28 5.80 115
1969 April 11 10.90 2,510 1989 April 3 6.64 303
1970 June 17 5.96 472 1990 June 13 6.67 32.0
1971 March 31 6.20 305 1991 May 23 6.74 50.0
1972 April 14 5.03 305 1992 March 6 8.14 239
1973 March 14 3.84 100 1993 July 24 14.50 1,450
1974 April 11 8.39 1,130 1994 March 22 9.91 1,020
1975 April 17 7.51 680
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 19 17.78 9,000 1972 April 14 5.03 305
1969 April 11 10.90 2,510 1989 April 3 6.64 303
1965 April 12 9.23 1,780 1957 September 3 5.07 248
1993 July 24 14.50 1,450 1992 March 6 8.14 239
1974 April 11 8.39 1,130 1968 June 8 4.46 210
1994 March 22 9.91 1,020 1986 March 20 6.51 210
1987 April 3 8.99 960 1988 March 28 5.80 115
1966 March 13 8.69 880 1973 March 14 3.84 100
1956 April 12 6.75 767 1980 March 30 8.15 100
1984 March 27 9.16 755 1985 March 10 5.50 88.0
1975 April 17 7.51 680 1964 June 19 3.65 60.0
1967 March 27 6.90 650 1958 October 25 3.31 56.0
1983 March 7 9.95 650 1991 May 23 6.74 50.0
1982 March 30 8.70 580 1961 March 2 3.60 40.0
1978 March 30 6.93 560 1990 June 13 6.67 32.0
1970 June 17 5.96 472 1959 March 14 4.42 30.0
1976 March 24 6.39 400 1981 February 17 4.65 28.0
1962 March 28 6.84 390 1977 March 15 3.18 25.0
1960 April 5 6.00 370 1963 April 6 3.47 24.0
1971 March 31 6.20 305
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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
__________________________________________________________________________________________________________________________________
1956 -- -- -- -- -- -- 118.0 12.1 10.6 3.25 1.75 1.84 --
1957 1.47 4.56 1.75 0.681 0 7.85 9.60 8.93 5.32 8.64 5.78 58.5 9.39
1958 29.8 20.5 7.42 1.90 2.18 4.64 12.6 7.14 8.60 11.8 2.15 1.28 9.22
1959 1.76 2.18 0.155 0 0 7.87 6.97 6.84 5.81 3.32 1.50 1.25 3.15
1960 2.60 0.380 0.610 0.019 0 32.2 84.9 7.32 7.17 1.85 2.31 2.11 11.7
1961 1.75 1.67 0.197 0.135 0.036 9.81 7.47 5.39 0.907 0.871 0.900 1.94 2.61
1962 1.66 1.41 0.574 0.103 0.100 25.6 46.8 14.3 18.0 14.2 2.53 2.86 10.7
1963 2.77 4.31 2.10 0.090 0 2.42 9.97 5.65 3.92 1.77 1.00 1.00 2.92
1964 0.971 1.25 0.726 0.223 0.197 0.587 13.6 6.00 17.6 11.8 4.58 4.53 5.16
1965 4.42 2.86 0.971 0.432 0.411 2.22 248.3 19.5 8.85 11.8 6.80 7.94 26.0
1966 9.66 5.63 3.06 0.239 0.086 163.8 28.7 26.3 22.8 19.7 5.97 2.87 24.4
1967 3.59 3.34 1.94 1.22 0.825 96.6 99.8 40.8 17.7 7.30 3.56 1.45 23.3
1968 3.21 2.18 1.48 0.558 0.549 20.0 14.2 17.3 31.6 11.1 4.88 4.04 9.27
1969 4.11 4.90 3.27 0.269 0.613 2.13 455.9 28.5 20.6 11.7 1.75 3.50 44.3
1970 4.89 5.51 4.19 1.79 2.00 12.7 43.7 26.4 50.6 10.9 6.13 6.86 14.6
1971 5.67 6.82 2.62 0.319 0.897 32.0 87.6 13.5 22.1 9.07 1.71 2.76 15.4
1972 5.04 7.06 2.99 1.38 0.192 66.2 79.8 33.7 13.6 2.57 2.76 1.94 18.1
1973 2.75 2.81 1.90 0.806 1.70 23.4 7.22 5.93 2.85 0.617 0.947 2.97 4.52
1974 3.65 2.95 1.71 0.393 0.731 2.40 232.9 37.4 16.5 2.23 1.91 1.44 25.1
1975 2.54 3.84 3.03 1.55 0.674 9.50 148.2 38.5 20.9 35.7 2.71 2.82 22.4
1976 3.23 3.44 1.89 1.02 3.66 76.8 33.7 7.59 2.41 1.17 0.087 0.128 11.3
1977 1.25 2.00 0.723 0.083 0.412 5.74 6.81 3.11 1.56 1.63 0.852 3.29 2.29
1978 3.52 4.92 3.33 0.733 0.180 59.8 83.7 12.0 3.35 0.824 0.811 0.737 14.5
1979 1.77 1.70 0.761 0.140 0.100 1.30 653.7 82.0 9.55 2.78 1.95 0.915 62.4
1980 1.32 1.98 1.88 0.931 0.445 15.4 29.5 2.69 1.84 0.238 1.98 1.12 4.93
1981 1.75 1.67 1.03 0.803 2.32 2.91 2.44 1.71 2.23 0.438 0.565 0.499 1.52
1982 2.14 2.33 1.11 0.481 1.61 67.5 75.0 10.4 6.48 4.56 0.952 0.607 14.5
1983 13.1 4.62 5.40 2.42 5.37 175.0 38.0 12.6 17.5 17.4 3.56 3.89 25.2
1984 3.58 4.08 1.82 1.91 4.28 143.3 60.4 23.7 5.39 0.639 0.076 0.094 20.9
1985 1.69 2.54 1.76 0.555 1.87 23.5 3.24 3.54 8.72 2.36 1.20 2.41 4.48
1986 4.86 3.05 1.79 2.33 1.73 48.6 31.1 37.4 4.73 5.66 4.62 5.19 12.7
1987 7.03 4.54 4.35 3.05 5.03 269.5 264.4 19.3 9.21 12.5 3.00 3.83 50.6
1988 6.19 5.62 3.40 1.05 1.68 41.4 25.5 9.73 1.94 0.353 0.673 0.549 8.20
1989 0.942 2.18 1.62 0.805 0.445 7.53 58.5 6.15 1.73 0.021 1.97 4.41 7.14
1990 1.27 2.66 0.582 0 0.061 2.86 12.3 2.08 12.3 7.31 0.266 0.499 3.51
1991 0.956 1.11 0.793 0 0.074 2.36 3.16 7.29 2.54 0.802 0.130 0.327 1.64
1992 0.473 1.01 1.02 1.50 4.61 78.7 7.10 2.58 2.14 2.67 0.652 1.80 8.77
1993 1.78 2.09 0.877 0.056 1.19 76.1 73.2 18.6 12.2 273.3 133.3 52.5 54.4
1994 15.3 10.9 7.23 5.38 4.84 195.9 125.4 35.4 49.4 51.5 14.6 40.1 46.6
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