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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 8.80 1974 0 m 1.76 2.64 1.50 4.70
November 2.20 1972 0 m 0.550 0.69 1.25 1.48
December 1.80 1963 0 m 0.160 0.37 2.37 0.42
January 1.04 1963 0 m 0.060 0.22 3.76 0.15
February 0.343 1958 0 m 0.030 0.08 3.11 0.07
March 11.6 1966 0 m 1.38 2.83 2.05 3.69
April 48.6 1971 0.050 1973 19.4 16.6 0.86 51.7
May 37.7 1974 0 1961 8.94 11.4 1.27 23.9
June 10.2 1962 0 1961 2.83 3.09 1.09 7.55
July 5.48 1966 0 m 1.23 1.64 1.33 3.29
August 2.27 1964 0 m 0.240 0.52 2.17 0.64
September 6.73 1972 0 m 0.920 1.79 1.93 2.47
Annual 7.41 1956 0.018 1961 3.11 2.28 0.73 100
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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 0.02 0 0 0 0 0 0 0 0
85 0 0 0 0.08 0.09 0.03 0 0 0 0 0 0 0
80 0 0 0 0.10 0.09 0.04 0 0 0 0 0 0 0
75 0 0 0 0.19 0.20 0.08 0 0 0 0 0 0 0
70 0 0 0 0.34 0.27 0.10 0.03 0 0 0 0.05 0 0
65 0 0 0 0.60 0.46 0.13 0.03 0 0 0 0.10 0 0
60 0 0 0 1.10 1.00 0.16 0.03 0 0 0.03 0.10 0 0
55 0 0 0 1.90 1.40 0.27 0.08 0 0 0.07 0.10 0 0.02
50 0 0 0 4.15 1.80 0.34 0.10 0 0 0.09 0.12 0.02 0.03
45 0 0 0 7.54 2.40 0.44 0.10 0 0 0.18 0.18 0.02 0.10
40 0 0 0 11.4 4.87 0.57 0.16 0.02 0.02 0.18 0.18 0.04 0.10
35 0 0 0 15.4 6.03 1.20 0.16 0.02 0.03 0.29 0.18 0.06 0.19
30 0 0 0.03 21.5 7.71 1.60 0.27 0.03 0.07 0.29 0.27 0.09 0.25
25 0 0 0.10 29.7 8.98 2.60 0.45 0.04 0.09 0.46 0.40 0.09 0.45
20 0.02 0 0.17 37.4 13.1 4.30 0.75 0.09 0.24 0.59 0.50 0.09 1.10
15 0.03 0.02 0.48 47.2 18.6 5.80 1.20 0.16 1.10 1.50 0.92 0.18 2.60
10 0.04 0.02 1.30 63.0 31.0 8.62 3.72 0.43 1.70 6.51 1.40 0.26 6.47
5 0.09 0.09 6.60 89.5 49.2 14.3 5.27 1.70 4.38 11.6 3.10 0.54 17.7
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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 ng 0.248 0.182 0.124 0.095
0.95 1.05 13.3 2.21 1.57 1.03 0.688
0.90 1.11 20.1 5.71 4.05 2.64 1.69
0.80 1.25 32.0 14.9 10.7 7.05 4.38
0.50 2 70.5 54.9 41.7 29.0 18.1
0.20 5 137 112 92.2 69.8 46.9
0.10 10 185 135 117 93.0 65.8
0.04 25 247 152 137 114 85.5
0.02 50 293 158 146 124 96.7
0.01 100 337 162 151 132 105
0.005 200 379 164 154 136 112
0.002 500 434 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 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 0.034
0.50 2 ng ng ng ng ng ng 0 0.016 0.203
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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 0 ng 0 0 ng 0 0 0
0.10 10 0 ng 0 0 ng 0 0 0
0.20 5 0 ng 0 0 ng 0 0 0
0.50 2 0 ng 0 0 ng 0 0 0.036
June-July-August September-October-November
_________________________ ___________________________
0.05 20 0 0 0 0 0 0 0 0
0.10 10 0 0 0 0 0 0 0 0
0.20 5 0 0 0 0 0 0 0 0
0.50 2 0 0 0 0.022 0 0 0 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)
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Annual peak discharge, by year, and corresponding gage height
1955 April 2 9.74 260 1967 May 7 6.52 94.0
1956 April 25 8.38 243 1968 June 25 3.61 8.60
1957 March 21 7.54 90.0 1969 April 10 7.29 129
1958 March 26 5.22 20.0 1970 April 25 6.65 106
1959 April 6 4.79 35.0 1971 April 9 7.92 128
1960 April 13 6.66 100 1972 April 14 10.29 94.0
1961 April 1 3.12 2.00 1973 August 9 9.89 16.0
1962 April 20 6.67 102 1974 April 20 10.85 122
1963 July 26 5.81 63.0 1975 April 29 10.27 53.0
1964 June 19 5.25 46.0 1976 April 6 10.64 44.0
1965 April 11 7.41 115 1977 October 26 9.83 36.0
1966 May 5 6.24 79.0
Annual peak discharge, from highest to lowest, and corresponding gage height
1955 April 2 9.74 260 1966 May 5 6.24 79.0
1956 April 25 8.38 243 1963 July 26 5.81 63.0
1969 April 10 7.29 129 1975 April 29 10.27 53.0
1971 April 9 7.92 128 1964 June 19 5.25 46.0
1974 April 20 10.85 122 1976 April 6 10.64 44.0
1965 April 11 7.41 115 1977 October 26 9.83 36.0
1970 April 25 6.65 106 1959 April 6 4.79 35.0
1962 April 20 6.67 102 1958 March 26 5.22 20.0
1960 April 13 6.66 100 1973 August 9 9.89 16.0
1967 May 7 6.52 94.0 1968 June 25 3.61 8.60
1972 April 14 10.29 94.0 1961 April 1 3.12 2.00
1957 March 21 7.54 90.0
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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]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1954 -- -- -- -- -- -- -- -- -- 0.332 0.677 2.37 --
1955 0.348 0.110 0.103 0 0 0.274 31.6 1.78 3.69 4.25 0 0 3.49
1956 2.42 0.207 0.100 0.123 0.183 0.106 47.9 31.7 5.06 0.868 0.303 0.290 7.41
1957 0.200 0.880 0.103 0.010 0.007 7.61 3.01 1.83 1.22 0.123 0 0.010 1.26
1958 0 0 0.323 0.006 0.343 2.76 1.20 0.106 0.123 0.535 0.016 0 0.453
1959 0.052 0.060 0 0 0 0.468 10.9 4.29 1.41 0.506 0 0 1.47
1960 0 0.023 0 0 0 0.006 31.0 2.50 0.107 0 0 0 2.76
1961 0 0 0 0 0 0.023 0.197 0 0 0 0 0 0.018
1962 0 0 0 0 0 0 20.4 13.3 10.2 3.18 0.490 1.91 4.12
1963 1.65 2.02 1.80 1.04 0 1.23 0.223 0.103 5.39 3.77 0.074 5.58 1.91
1964 0.394 0.137 0.039 0 0 0.010 6.75 7.31 4.51 2.25 2.27 1.45 2.09
1965 3.86 0.270 0.268 0.023 0 0 34.8 12.5 7.53 2.19 0.148 0.850 5.18
1966 1.06 1.23 0.302 0.039 0 11.6 20.9 18.7 0.446 5.48 0.131 0.003 5.03
1967 2.69 1.88 0.022 0.020 0.020 2.53 21.6 23.9 0.207 0.029 0 0 4.43
1968 0.016 0.726 0.050 0 0 1.20 2.70 2.91 2.76 1.19 1.27 0.362 1.10
1969 0.492 0.455 0 0 0 0.052 40.2 4.40 0.104 0.208 0 0 3.79
1970 1.89 0.067 0.307 0 0 0 37.8 29.0 4.15 0.087 0.021 0.028 6.12
1971 6.13 0.582 0.011 0 0 0 48.6 5.04 9.39 3.58 0.030 0.028 6.07
1972 0.027 2.20 0.066 0.004 0 3.22 22.4 2.07 0.153 0.085 0.063 6.73 3.05
1973 0.209 0.139 0.002 0 0 0.455 0.050 0.029 0.042 0.014 0.130 0.010 0.091
1974 8.80 1.24 0.069 0.025 0.015 0.008 37.6 37.7 2.00 0.068 0.068 0.011 7.33
1975 8.37 0.273 0.018 0 0 0.002 6.39 4.38 2.08 0.811 0.046 0.003 1.88
1976 0.053 0.083 0.049 0.031 0.017 0.173 19.0 1.99 4.46 0.048 0.027 2.25 2.32
1977 1.82 0.167 0 0 0 0.043 0.095 0.017 0.002 0.002 0.001 0.287 0.205
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U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:46:16 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05100500.html |
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