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Last update: Wednesday, 23-Feb-2005 09:46:11 EST
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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 68.6 1994 0 m 3.04 12.0 3.94 1.66
November 25.7 1994 0 m 1.28 5.54 3.55 0.70
December 1.51 1994 0 m 0.090 0.30 3.14 0.05
January 0.078 1994 0 m 0 0.02 3.94 0
February 4.90 1981 0 m 0.150 0.85 5.61 0.08
March 42.5 1992 0 m 6.01 9.43 1.57 3.27
April 353 1992 0.225 1973 85.7 103 1.21 46.7
May 390 1979 0.061 1988 54.7 94.1 1.72 29.8
June 123 1974 0 m 17.2 27.3 1.59 9.40
July 35.7 1993 0 m 6.83 9.90 1.45 3.72
August 70.4 1993 0 m 4.08 12.2 2.98 2.22
September 99.7 1993 0 m 4.29 17.1 3.99 2.34
Annual 65.1 1974 0.378 1988 15.7 17.6 1.12 100
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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 0.40 0.10 0 0 0 0 0 0 0 0
85 0 0 0 0.57 0.18 0 0 0 0 0 0 0 0
80 0 0 0 1.10 0.47 0 0 0 0 0 0 0 0
75 0 0 0 2.20 0.65 0.05 0 0 0 0 0 0 0
70 0 0 0 4.49 1.20 0.32 0 0 0 0 0 0 0
65 0 0 0 7.00 1.70 1.10 0.03 0 0 0 0 0 0
60 0 0 0 10.7 3.66 1.60 0.10 0 0 0 0 0 0
55 0 0 0 15.8 7.01 3.35 0.31 0 0 0 0 0 0
50 0 0 0 20.6 15.0 4.80 0.73 0.02 0 0 0 0 0
45 0 0 0 26.4 21.4 8.52 1.70 0.13 0 0.03 0 0 0.05
40 0 0 0.07 34.3 29.1 11.7 3.70 0.39 0.05 0.05 0 0 0.21
35 0 0 0.35 48.2 38.8 14.5 5.53 0.89 0.17 0.09 0.04 0 0.84
30 0 0 1.00 66.9 48.8 16.6 7.36 1.60 0.40 0.26 0.10 0 1.70
25 0 0 1.80 91.6 62.1 18.7 8.63 2.70 0.92 0.45 0.23 0 4.16
20 0 0 4.61 161 80.6 21.9 10.9 4.57 1.60 1.30 0.30 0 7.61
15 0 0 7.45 225 105 26.7 14.4 5.64 3.87 2.30 1.10 0 15.5
10 0 0 12.4 302 149 38.3 19.1 8.68 6.78 4.14 2.40 0 30.6
5 0 0 33.0 421 270 73.1 29.2 13.4 10.4 7.64 4.91 0.29 81.5
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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 4.40 3.15 2.18 1.51 0.962
0.95 1.05 14.1 9.57 6.81 4.83 3.20
0.90 1.11 25.1 16.8 12.2 8.80 5.97
0.80 1.25 48.8 32.5 24.2 17.9 12.5
0.50 2 156 106 83.5 65.6 48.5
0.20 5 432 314 265 224 176
0.10 10 698 533 467 415 338
0.04 25 1,120 911 836 784 662
0.02 50 1,490 1,270 1,200 1,170 1,010
0.01 100 1,910 1,690 1,650 1,660 1,470
0.005 200 2,360 2,180 2,190 2,280 2,060
0.002 500 3,010 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
0.50 2 ng ng ng ng ng ng 0 0 0.024
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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 0 0 0
0.10 10 ng ng ng ng ng 0 0 0
0.20 5 ng ng ng ng ng 0 0 0
0.50 2 ng ng ng ng ng 0 0 0.643
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 0.116 0 0 0 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)
_____________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
1961 March 27 1,224.21 13.6 1978 April 27 1,226.31 247
1962 April 18 1,226.41 101 1979 April 21 1,229.94 1,130
1963 March 21 1,226.39 9.90 1980 April 5 1,225.71 67.0
1964 April 9 1,224.18 21.7 1981 May 22 1,225.67 82.0
1965 April 11 1,225.12 44.0 1982 June 6 1,228.38 505
1966 April 14 1,226.36 227 1983 April 6 1,225.87 56.0
1967 April 20 1,226.54 310 1984 March 26 1,224.75 14.9
1968 August 25 1,224.01 79.4 1985 April 8 1,226.68 190
1969 April 11 1,227.39 653 1986 June 3 1,228.07 427
1970 April 25 1,226.27 279 1987 April 5 1,228.77 438
1971 April 12 -- 658 1988 April 3 1,225.34 29.0
1972 April 16 -- 402 1989 April 14 1,226.64 185
1973 March 18 -- 21.2 1990 April 3 1,226.57 155
1974 May 21 1,227.64 823 1991 July 12 1,226.63 188
1975 April 28 1,224.64 158 1992 April 8 1,228.86 600
1976 April 8 -- 344 1993 July 28 1,226.69 155
1977 May 19 1,225.43 29.0 1994 April 15 1,227.84 378
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 21 1,229.94 1,130 1989 April 14 1,226.64 185
1974 May 21 1,227.64 823 1975 April 28 1,224.64 158
1971 April 12 -- 658 1990 April 3 1,226.57 155
1969 April 11 1,227.39 653 1993 July 28 1,226.69 155
1992 April 8 1,228.86 600 1962 April 18 1,226.41 101
1982 June 6 1,228.38 505 1981 May 22 1,225.67 82.0
1987 April 5 1,228.77 438 1968 August 25 1,224.01 79.4
1986 June 3 1,228.07 427 1980 April 5 1,225.71 67.0
1972 April 16 -- 402 1983 April 6 1,225.87 56.0
1994 April 15 1,227.84 378 1965 April 11 1,225.12 44.0
1976 April 8 -- 344 1977 May 19 1,225.43 29.0
1967 April 20 1,226.54 310 1988 April 3 1,225.34 29.0
1970 April 25 1,226.27 279 1964 April 9 1,224.18 21.7
1978 April 27 1,226.31 247 1973 March 18 -- 21.2
1966 April 14 1,226.36 227 1984 March 26 1,224.75 14.9
1985 April 8 1,226.68 190 1961 March 27 1,224.21 13.6
1991 July 12 1,226.63 188 1963 March 21 1,226.39 9.90
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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
__________________________________________________________________________________________________________________________________
1961 -- -- -- -- -- 2.04 2.65 0.955 0.400 0 0 0 --
1962 0 0 0 0 0 0 16.4 0.887 0 0 0 0 1.43
1963 0 0 0 0 0 2.36 0.677 0.603 3.01 0.594 0.035 0 0.608
1964 0 0 0 0 0 1.81 6.63 0.297 0.167 0.023 0 0 0.737
1965 0 0 0 0 0 0.284 12.6 2.95 2.80 0.826 0.074 1.73 1.76
1966 3.03 1.39 0 0 0 22.0 122.7 57.5 14.8 8.27 3.89 1.25 19.6
1967 0.345 0.067 0 0 0 6.32 46.4 97.7 24.9 9.50 2.07 1.46 15.8
1968 12.3 3.52 0.023 0 0 4.93 14.1 3.93 0.257 4.37 10.9 6.04 5.05
1969 0.737 0.078 0 0 0 0 266.9 103.7 22.1 12.1 4.14 0.183 34.0
1970 0.010 0 0 0 0 0 73.6 155.2 79.0 34.9 11.0 8.22 30.3
1971 2.37 0.859 0 0 0 0 295.6 139.4 22.5 25.8 5.86 2.97 41.2
1972 2.52 0.461 0.085 0 0 16.8 126.7 52.0 5.55 0.226 0 0 16.9
1973 0 0 0 0 0 5.25 0.225 0.081 0 0 0 0 0.471
1974 0 0 0 0 0 0 233.1 382.9 123.0 22.8 9.67 6.84 65.1
1975 4.78 3.17 0.442 0.008 0 4.15 26.0 36.5 11.8 0.981 0.086 0.166 7.37
1976 0.229 0.047 0 0 0 0.597 200.5 61.6 18.2 10.2 6.63 1.60 24.8
1977 0.039 0 0 0 0 0.281 2.62 1.65 0.273 0.001 0 0.096 0.413
1978 0.008 0 0 0 0 0.474 99.8 43.5 2.25 0.688 0.394 0.007 12.2
1979 0 0 0 0 0 0 222.1 390.5 59.7 18.8 1.75 2.50 58.3
1980 0.067 0.083 0.014 0 0 0.161 12.8 2.03 0.051 0 0.001 0.201 1.27
1981 2.61 5.24 0.308 0 4.90 5.92 21.1 10.7 4.07 0.573 0.112 0.023 4.59
1982 0.074 0.037 0 0 0 5.93 61.9 23.2 67.6 4.35 0.280 0 13.5
1983 0.205 0.152 0.746 0 0.005 7.36 23.6 7.41 0.341 5.16 2.22 0.011 3.94
1984 0.055 0.058 0.002 0 0.021 3.88 2.99 2.00 0.059 0 0 0 0.759
1985 0 0 0 0 0 22.1 56.5 3.94 4.23 2.22 0.112 0 7.40
1986 0.389 0.086 0 0 0 20.4 54.2 40.4 41.8 6.55 0.228 0 13.7
1987 0 0 0 0 0 0.016 251.6 48.9 7.99 0.077 1.63 0.072 25.6
1988 0.020 0.007 0 0 0.082 1.45 2.95 0.061 0 0 0 0 0.378
1989 0 0 0 0 0 0 24.4 1.03 0.010 0 0 0 2.09
1990 0 0 0 0 0.010 1.50 14.2 0.366 16.9 2.15 0.032 0.001 2.90
1991 0 0 0 0 0 5.86 4.57 1.30 5.85 14.0 0.528 0 2.70
1992 2.08 1.02 0 0.041 0 42.5 353.3 77.3 13.7 4.92 0.823 0.029 41.0
1993 0 0.254 0 0 0 0.309 41.2 29.2 15.0 35.7 70.4 99.7 24.4
1994 68.6 25.7 1.51 0.078 0 19.5 219.9 79.7 17.9 6.28 5.72 12.8 38.1
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U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:46:11 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05099100.html |
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