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Last update: Wednesday, 23-Feb-2005 09:45:58 EST
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Statistics of monthly and annual mean discharges
[m, more than 1 year of occurrence; ng, statistic not given]
__________________________________________________________________________________________________________
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 3.45 1983 0 m 0.210 0.67 3.26 0.62
November 0.439 1983 0 m 0.040 0.10 2.63 0.11
December 0.029 1982 0 m 0 0.01 3.80 0
January 0 m 0 m 0 0 ng 0
February 7.10 1981 0 m 0.240 1.30 5.48 0.72
March 15.1 1966 0 m 3.09 4.68 1.51 9.40
April 87.9 1979 0 m 19.5 22.5 1.15 59.4
May 68.8 1974 0 m 5.22 14.2 2.73 15.9
June 19.5 1964 0 m 1.75 4.36 2.48 5.33
July 33.3 1982 0 m 2.13 6.23 2.93 6.48
August 7.02 1966 0 m 0.560 1.63 2.94 1.69
September 1.23 1981 0 m 0.110 0.30 2.66 0.34
Annual 11.4 1974 0.009 1963 2.73 2.77 1.01 100
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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 0 0 0 0 0 0 0 0 0 0
90 0 0 0 0 0 0 0 0 0 0 0 0 0
85 0 0 0 0 0 0 0 0 0 0 0 0 0
80 0 0 0 0 0 0 0 0 0 0 0 0 0
75 0 0 0 0.09 0 0 0 0 0 0 0 0 0
70 0 0 0 0.32 0 0 0 0 0 0 0 0 0
65 0 0 0 0.80 0 0 0 0 0 0 0 0 0
60 0 0 0 1.50 0.03 0 0 0 0 0 0 0 0
55 0 0 0 2.00 0.07 0 0 0 0 0 0 0 0
50 0 0 0 2.80 0.12 0 0 0 0 0 0 0 0
45 0 0 0 4.46 0.17 0 0 0 0 0 0 0 0
40 0 0 0 5.72 0.31 0.03 0 0 0 0 0 0 0
35 0 0 0 8.02 0.58 0.08 0 0 0 0 0 0 0
30 0 0 0.02 11.3 0.80 0.14 0.03 0 0 0 0 0 0
25 0 0 0.34 16.1 1.10 0.24 0.19 0 0 0 0 0 0.05
20 0 0 1.00 23.1 1.50 0.33 0.46 0 0 0.05 0 0 0.19
15 0 0 3.00 35.8 3.02 0.78 1.50 0.09 0.07 0.14 0 0 0.52
10 0 0 9.53 57.6 6.02 1.90 3.69 0.37 0.18 0.27 0.10 0 1.90
5 0 0 21.9 93.4 22.6 7.40 10.4 2.60 0.46 0.91 0.24 0 10.9
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Probability of occurrence of annual high discharges
[ng, statistic not given]
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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 0.900 0.173 0.078 0.043 0.023
0.95 1.05 4.10 1.32 0.765 0.489 0.282
0.90 1.11 8.60 3.41 2.19 1.47 0.874
0.80 1.25 20.2 9.58 6.73 4.69 2.85
0.50 2 88.2 49.1 37.6 26.0 15.9
0.20 5 315 167 126 80.0 47.7
0.10 10 569 273 200 118 68.9
0.04 25 1,010 417 290 159 90.2
0.02 50 1,420 523 349 182 102
0.01 100 1,900 622 399 200 110
0.005 200 2,440 712 442 213 116
0.002 500 3,240 ng ng ng ng
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Probability of occurrence of annual low discharges
[ng, statistic not given]
____________________________________________________________________________
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 ng ng ng ng ng ng ng ng 0
0.10 10 ng ng ng ng ng ng ng ng 0
0.20 5 ng ng ng ng ng ng ng ng 0
0.50 2 ng ng ng ng ng ng ng ng 0
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Probability of occurrence of seasonal low discharges
[ng, statistic not given]
_______________________________________________________________________________
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 ng ng ng ng ng ng 0 0
0.10 10 ng ng ng ng ng ng 0 0
0.20 5 ng ng ng ng ng ng 0 0
0.50 2 ng ng ng ng ng ng 0 0
June-July-August September-October-November
_________________________ __________________________
0.05 20 ng ng ng 0 ng ng ng 0
0.10 10 ng ng ng 0 ng ng ng 0
0.20 5 ng ng ng 0 ng ng ng 0
0.50 2 ng ng ng 0 ng ng ng 0
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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)
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Annual peak discharge, by year, and corresponding gage height
1961 March 23 3.11 1.60 1976 June 12 5.30 140
1962 April 21 4.62 100 1977 April 10 4.10 37.0
1963 June 25 3.44 7.00 1978 April 9 5.82 282
1964 June 19 5.23 192 1979 April 22 7.17 737
1965 April 11 5.76 240 1980 May 27 6.10 420
1966 April 5 4.91 134 1981 April 2 4.47 65.0
1967 May 10 5.33 192 1982 July 24 6.38 506
1968 March 8 4.27 5.00 1983 April 8 5.03 67.0
1969 April 11 6.82 425 1984 March 30 4.41 25.0
1970 April 7 4.84 74.0 1985 March 16 5.19 62.0
1971 April 8 6.54 235 1986 March 25 5.10 86.0
1972 April 16 4.12 53.0 1987 April 7 6.85 654
1973 March 12 -- 4.00 1988 April 4 4.62 22.0
1974 May 19 7.11 984 1989 April 22 4.62 34.0
1975 July 1 4.55 71.0 1990 April 3 -- 7.00
Annual peak discharge, from highest to lowest, and corresponding gage height
1974 May 19 7.11 984 1970 April 7 4.84 74.0
1979 April 22 7.17 737 1975 July 1 4.55 71.0
1987 April 7 6.85 654 1983 April 8 5.03 67.0
1982 July 24 6.38 506 1981 April 2 4.47 65.0
1969 April 11 6.82 425 1985 March 16 5.19 62.0
1980 May 27 6.10 420 1972 April 16 4.12 53.0
1978 April 9 5.82 282 1977 April 10 4.10 37.0
1965 April 11 5.76 240 1989 April 22 4.62 34.0
1971 April 8 6.54 235 1984 March 30 4.41 25.0
1964 June 19 5.23 192 1988 April 4 4.62 22.0
1967 May 10 5.33 192 1963 June 25 3.44 7.00
1976 June 12 5.30 140 1990 April 3 -- 7.00
1966 April 5 4.91 134 1968 March 8 4.27 5.00
1962 April 21 4.62 100 1973 March 12 -- 4.00
1986 March 25 5.10 86.0 1961 March 23 3.11 1.60
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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
__________________________________________________________________________________________________________________________________
1961 0 0 0 0 0 0.171 0 0 0 0 0 0 0.015
1962 0 0 0 0 0 0 19.5 0.168 0.757 0 0 0 1.68
1963 0 0 0 0 0 0.042 0.010 0 0.053 0 0 0 0.009
1964 0 0 0 0 0 0 4.36 0 19.5 0.942 0 0 2.03
1965 0 0 0 0 0 0 31.6 0.652 1.57 1.12 0 0.227 2.89
1966 0.190 0.003 0 0 0 15.1 26.3 19.1 0.745 3.81 7.02 0.213 6.08
1967 0 0 0 0 0 6.90 40.0 38.6 0 0 0 0 7.15
1968 0 0 0 0 0 0.379 0.004 0.001 0.021 0 0 0 0.034
1969 0 0 0 0 0 0 53.0 0.228 0 0 0 0 4.38
1970 0 0 0 0 0 0 12.2 3.24 0.086 0 0 0 1.28
1971 0 0 0 0 0 0 35.4 0.654 0.206 3.41 0.091 0 3.28
1972 0 0 0 0 0 9.47 15.2 1.51 0.008 0 0 0 2.17
1973 0 0 0 0 0 0.340 0 0 0 0 0 0 0.029
1974 0 0 0 0 0 0 63.7 68.8 4.31 0.019 0 0 11.4
1975 0 0 0 0 0 0 8.40 4.00 0.066 8.06 0.026 0.052 1.73
1976 0.060 0.034 0 0 0 6.56 18.0 0.022 4.35 0.017 0.149 0 2.41
1977 0 0 0 0 0 3.53 3.86 0.386 0.298 0 0 0.004 0.674
1978 0.061 0 0 0 0 2.77 49.0 3.21 1.40 3.97 0.152 0.098 5.01
1979 0 0 0 0 0 0 87.9 7.70 0.063 0.856 0 0 7.95
1980 0 0 0 0 0 0 3.26 3.28 2.70 0.550 0.192 1.05 0.916
1981 0.608 0.286 0.002 0 7.10 5.72 5.09 0.079 0.242 1.06 5.33 1.23 2.19
1982 0.319 0.170 0.029 0 0 0.219 24.0 0.787 14.5 33.3 2.92 0.014 6.37
1983 3.45 0.439 0 0 0 7.12 15.5 1.24 1.03 0.265 0 0 2.42
1984 0.054 0.034 0 0 0 4.66 3.43 0.131 0.126 0.002 0 0 0.705
1985 0 0 0 0 0 13.3 1.44 0.318 0.098 0 0.110 0.453 1.33
1986 1.34 0.145 0 0 0 14.4 4.59 1.29 0.252 6.36 0.655 0.013 2.46
1987 0.078 0.018 0.016 0 0 0 49.6 0.763 0.116 0.086 0.026 0 4.17
1988 0 0 0 0 0 2.04 3.94 0.022 0 0 0 0 0.498
1989 0 0 0 0 0 0 4.42 0.293 0 0 0 0 0.388
1990 0 0 0 0 0 0.032 2.23 0.159 0.090 0.032 0 0 0.210
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