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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 0.224 1981 0 m 0.030 0.07 2.40 0.11
November 0.125 1981 0 m 0.010 0.04 3.32 0.04
December 0 m 0 m 0 0 ng 0
January 0 m 0 m 0 0 ng 0
February 0 m 0 m 0 0 ng 0
March 7.92 1985 0 m 2.03 2.54 1.26 7.83
April 124 1979 0 m 19.6 32.5 1.66 75.7
May 38.1 1974 0 m 3.21 9.74 3.03 12.4
June 2.36 1983 0 m 0.370 0.64 1.73 1.43
July 6.17 1986 0 m 0.450 1.58 3.53 1.74
August 1.27 1985 0 m 0.100 0.32 3.15 0.40
September 0.670 1985 0 m 0.080 0.18 2.29 0.31
Annual 10.6 1979 0.005 1977 2.29 3.37 1.47 100
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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 0 0 0 0 0 0 0 0 0
70 0 0 0 0 0 0 0 0 0 0 0 0 0
65 0 0 0 0 0 0 0 0 0 0 0 0 0
60 0 0 0 0 0 0 0 0 0 0 0 0 0
55 0 0 0 0.16 0 0 0 0 0 0 0 0 0
50 0 0 0 0.43 0 0 0 0 0 0 0 0 0
45 0 0 0 0.86 0 0 0 0 0 0 0 0 0
40 0 0 0 1.20 0 0 0 0 0 0 0 0 0
35 0 0 0 1.70 0 0 0 0 0 0 0 0 0
30 0 0 0 3.34 0.02 0 0 0 0 0 0 0 0
25 0 0 0 6.90 0.25 0.02 0 0 0 0 0 0 0
20 0 0 0 15.3 0.61 0.09 0 0 0 0 0 0 0
15 0 0 0.37 24.8 1.50 0.36 0 0 0 0 0 0 0
10 0 0 4.32 49.7 2.70 0.70 0.07 0 0.09 0.08 0 0 0.22
5 0 0 17.4 92.3 13.8 1.40 0.43 0.21 0.44 0.16 0.03 0 1.70
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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 ng 0.029 0.014 0.005 0.005
0.95 1.05 ng 0.449 0.250 0.112 0.085
0.90 1.11 15.7 1.60 0.946 0.467 0.310
0.80 1.25 28.8 6.21 3.90 2.11 1.24
0.50 2 85.6 50.0 33.7 19.8 10.4
0.20 5 232 219 151 88.2 46.5
0.10 10 376 384 264 149 81.7
0.04 25 614 609 415 224 129
0.02 50 830 768 517 271 163
0.01 100 1,080 909 607 308 192
0.005 200 1,360 1,030 682 338 218
0.002 500 1,780 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 ng
0.10 10 ng ng ng ng ng ng ng ng ng
0.20 5 ng ng ng ng ng ng ng ng ng
0.50 2 ng ng ng ng ng ng ng ng ng
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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 ng 0
0.10 10 ng ng ng ng ng ng ng 0
0.20 5 ng ng ng ng ng ng ng 0
0.50 2 ng ng ng ng ng ng ng 0
June-July-August September-October-November
_________________________ ___________________________
0.05 20 ng ng ng ng ng ng ng ng
0.10 10 ng ng ng ng ng ng ng ng
0.20 5 ng ng ng ng ng ng ng ng
0.50 2 ng ng ng ng ng ng ng ng
_____________________________________________________________________________________
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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
1972 April 13 6.02 85.0 1980 March 30 8.92 40.0
1973 June 19 3.94 4.60 1981 April 1 6.53 80.0
1974 April 23 7.19 212 1982 April 13 -- 90.0
1975 April 30 5.70 73.0 1983 April 4 7.95 166
1976 April 3 7.10 268 1984 March 29 8.66 88.0
1977 July 2 4.72 2.20 1985 March 14 11.25 59.0
1978 March 27 11.60 73.0 1986 July 12 7.50 90.0
1979 April 20 9.30 940
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 20 9.30 940 1981 April 1 6.53 80.0
1976 April 3 7.10 268 1975 April 30 5.70 73.0
1974 April 23 7.19 212 1978 March 27 11.60 73.0
1983 April 4 7.95 166 1985 March 14 11.25 59.0
1982 April 13 -- 90.0 1980 March 30 8.92 40.0
1986 July 12 7.50 90.0 1973 June 19 3.94 4.60
1984 March 29 8.66 88.0 1977 July 2 4.72 2.20
1972 April 13 6.02 85.0
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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; --, no data]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1972 0 0 0 0 0 0 7.93 0 0 0 0 0 0.650
1973 0 0 0 0 0 0.214 0 0 0.242 0 0 0 0.038
1974 0 0 0 0 0 0 44.7 38.1 0.436 0 0 0 6.95
1975 0 0 0 0 0 0 10.0 3.88 0 0 0 0 1.16
1976 0 0 0 0 0 0.355 24.2 0 0 0 0 0 2.02
1977 0 0 0 0 0 0 0 0.003 0.001 0.014 0 0.047 0.005
1978 0.049 0 0 0 0 5.35 7.46 0.031 0 0 0 0.057 1.08
1979 0 0 0 0 0 0 123.8 3.55 0.811 0.078 0.119 0.107 10.6
1980 0 0 0 0 0 1.58 1.68 0 0.014 0 0.079 0.329 0.306
1981 0.224 0.125 0 0 0 2.24 3.95 0.147 1.06 0.044 0.012 0 0.648
1982 0.035 0 0 0 0 1.39 18.4 0.279 0.173 0.326 0 0 1.70
1983 -- -- -- -- -- 3.62 45.4 0.050 2.36 0.071 0 0 --
1984 -- -- -- -- -- 1.82 1.38 0.003 0.409 0 0 0 --
1985 -- -- -- -- -- 7.92 1.13 0.055 0.006 0.036 1.27 0.670 --
1986 -- -- -- -- -- 5.90 4.09 2.10 0.051 6.17 0.066 0 --
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