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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 11.2 1958 0 m 0.990 2.94 2.97 0.42
November 16.2 1958 0 m 1.23 3.92 3.18 0.52
December 5.35 1958 0 m 0.390 1.22 3.10 0.17
January 0.719 1958 0 m 0.040 0.15 4.23 0.02
February 3.31 1976 0 m 0.210 0.74 3.54 0.09
March 273 1966 0 m 26.8 62.9 2.34 11.4
April 715 1969 0 m 99.0 159 1.60 42.0
May 153 1969 0 m 38.4 46.5 1.21 16.3
June 161 1962 0 m 28.1 42.6 1.52 11.9
July 351 1962 0 m 35.1 78.4 2.24 14.9
August 58.7 1962 0 m 5.05 12.8 2.53 2.14
September 2.28 1969 0 m 0.390 0.66 1.72 0.16
Annual 81.1 1969 0.009 1977 19.6 23.5 1.20 100
__________________________________________________________________________________________________________
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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 0.06 0 0 0 0 0 0 0 0 0
80 0 0 0 0.79 0.14 0 0 0 0 0 0 0 0
75 0 0 0 1.60 1.30 0.12 0 0 0 0 0 0 0
70 0 0 0 2.59 2.60 0.31 0 0 0 0 0 0 0
65 0 0 0 3.99 3.90 0.58 0.03 0 0 0 0 0 0
60 0 0 0 11.7 5.35 1.10 0.15 0 0 0 0 0 0
55 0 0 0.05 23.2 8.49 2.00 0.86 0 0 0 0 0 0
50 0 0 0.08 33.6 13.5 3.98 1.70 0 0 0 0 0 0
45 0 0 0.15 49.5 19.0 5.97 3.60 0 0 0 0 0 0.03
40 0 0 0.29 66.2 24.0 9.60 6.83 0.13 0 0 0 0 0.09
35 0 0 0.80 80.2 34.7 13.6 13.7 0.57 0 0 0.02 0 0.38
30 0 0 2.20 94.9 42.1 22.5 21.9 1.00 0 0.02 0.03 0 1.10
25 0 0 4.49 111 50.2 36.2 28.0 1.80 0.04 0.03 0.03 0 3.67
20 0 0 7.95 128 62.0 45.0 34.3 3.96 0.20 0.05 0.05 0.04 9.33
15 0 0 22.3 173 82.5 60.2 45.2 8.00 0.39 0.09 0.18 0.05 22.4
10 0 0.04 45.2 253 116 88.6 92.9 13.8 0.73 0.49 0.74 0.90 48.0
5 0.04 0.10 175 394 165 157 215 25.7 2.10 7.70 11.4 3.10 110
______________________________________________________________________________________________________________________
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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 ng 0.101 0.066 0.036 0.020
0.95 1.05 12.1 1.48 0.986 0.580 0.358
0.90 1.11 24.3 5.08 3.44 2.12 1.37
0.80 1.25 53.1 18.8 13.2 8.58 5.80
0.50 2 198 138 107 76.9 54.8
0.20 5 586 548 481 385 279
0.10 10 951 913 861 728 526
0.04 25 1,500 1,370 1,400 1,250 895
0.02 50 1,950 1,680 1,790 1,660 1,180
0.01 100 2,420 1,940 2,160 2,050 1,440
0.005 200 2,910 2,150 2,480 2,420 1,690
0.002 500 3,550 ng ng ng ng
__________________________________________________________________________________________________
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Probability of annual low discharges
[ng, statistic not given]
____________________________________________________________________________________
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 ng ng ng ng ng ng 0 0 0
0.10 10 ng ng ng ng ng ng 0 0 0
0.20 5 ng ng ng ng ng ng 0 0 0
0.50 2 ng ng ng ng ng ng 0 0 0
____________________________________________________________________________________
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Probability of seasonal low discharges
[ng, statistic not given]
_____________________________________________________________________________________
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 ng ng ng ng 0 0 0 0
0.10 10 ng ng ng ng 0 0 0 0
0.20 5 ng ng ng ng 0 0 0 0
0.50 2 ng ng ng ng 0 0 0.007 0.878
June-July-August September-October-November
________________________ _________________________
0.05 20 0 0 0 0 ng ng ng 0
0.10 10 0 0 0 0 ng ng ng 0
0.20 5 0 0 0 0 ng ng ng 0
0.50 2 0 0 0 0 ng ng ng 0
_____________________________________________________________________________________
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Annual peak discharge and corresponding gage height
_____________________________________________________________________________________
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
1957 April 19 6.07 150 1969 April 12 9.32 1,710
1958 April 15 5.08 131 1970 June 17 4.24 177
1959 June 12 3.51 54.0 1971 March 14 4.02 55.0
1960 April 19 4.40 123 1972 March 27 6.05 488
1961 March 12 2.77 1.20 1973 July 1 3.88 114
1962 July 6 8.95 1,080 1974 March 7 3.62 53.0
1963 June 10 3.95 107 1975 July 1 7.66 636
1964 April 27 4.30 153 1976 March 28 4.30 185
1965 April 14 6.08 375 1977 March 26 2.98 3.60
1966 March 19 7.28 757 1978 April 4 6.24 499
1967 July 8 5.72 309 1979 April 12 7.29 600
1968 July 17 3.63 55.0
Annual peak discharge, from highest to lowest, and corresponding gage height
1969 April 12 9.32 1,710 1957 April 19 6.07 150
1962 July 6 8.95 1,080 1958 April 15 5.08 131
1966 March 19 7.28 757 1960 April 19 4.40 123
1975 July 1 7.66 636 1973 July 1 3.88 114
1979 April 12 7.29 600 1963 June 10 3.95 107
1978 April 4 6.24 499 1968 July 17 3.63 55.0
1972 March 27 6.05 488 1971 March 14 4.02 55.0
1965 April 14 6.08 375 1959 June 12 3.51 54.0
1967 July 8 5.72 309 1974 March 7 3.62 53.0
1976 March 28 4.30 185 1977 March 26 2.98 3.60
1970 June 17 4.24 177 1961 March 12 2.77 1.20
1964 April 27 4.30 153
_____________________________________________________________________________________
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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
__________________________________________________________________________________________________________________________________
1958 11.2 16.2 5.35 0.719 1.20 33.4 100.6 16.3 0.997 0.351 0 0 15.5
1959 0 0 0 0 0 0 0 0 1.82 0.116 0 0 0.159
1960 0.010 0.030 0.050 0.040 0.040 4.99 54.0 15.3 0.447 0 0 0 6.19
1961 0 0 0 0 0.018 0.200 0 0.032 0 0 0 0 0.021
1962 0.006 0 0 0 0 7.14 148.3 135.5 161.3 351.4 58.7 1.66 72.5
1963 0.019 0.367 2.28 0.023 0 8.92 30.3 16.5 58.7 9.32 0 0 10.5
1964 0 0 0 0 0 0.110 66.3 36.5 7.60 10.8 0.681 0.053 10.1
1965 0 0 0 0 0 0 156.9 45.1 46.1 28.5 5.35 0.520 23.4
1966 1.48 0.491 0.006 0 0 273.3 109.9 50.3 14.1 16.0 10.5 0.467 40.1
1967 8.65 9.65 .914 0.003 0 14.0 77.3 80.8 127.4 105.5 5.14 0 35.9
1968 0 0 0 0 0 0.177 1.76 5.27 2.17 3.32 0 1.26 1.17
1969 0.066 0.039 0.006 0 0 0 715.0 152.9 49.6 42.4 17.4 2.28 81.1
1970 0.032 0.033 0.014 0.010 0.015 3.17 19.6 18.0 43.7 3.78 0 0 7.34
1971 0.002 0.010 0.002 0 0 5.07 2.50 0.031 0.011 1.57 0.005 0.002 0.774
1972 0.033 0.168 0.019 0 0 133.3 95.1 95.9 39.1 5.65 0.659 0.011 31.0
1973 0.028 0.016 0.002 0 0 2.14 2.35 0.477 5.85 2.03 0 0.767 1.14
1974 0.172 0.045 0.009 0 0 7.97 2.58 2.45 0.184 0 0 0 1.13
1975 0 0 0 0 0 0 6.67 5.68 10.7 39.4 0.969 0.082 5.35
1976 0.011 0.051 0 0 3.31 37.1 67.0 8.57 0.009 0 0 0 9.62
1977 0 0 0 0 0 0.073 0.035 0 0 0 0 0 0.009
1978 0 0 0 0 0 58.5 257.0 62.9 32.2 127.7 7.43 1.38 45.7
1979 0.061 0 0 0 0 0.850 265.6 96.8 15.3 23.6 4.16 0.005 33.7
__________________________________________________________________________________________________________________________________
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