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Last update: Wednesday, 23-Feb-2005 09:46:00 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 94.1 1983 0 m 8.96 19.5 2.18 1.93
November 33.4 1957 0 m 5.18 7.72 1.49 1.12
December 15.8 1983 0 m 2.33 3.09 1.33 0.50
January 4.65 1983 0 m 1.02 1.22 1.21 0.22
February 3.32 1983 0 m 0.750 0.91 1.21 0.16
March 217 1983 0 m 25.1 43.5 1.73 5.42
April 747 1966 0.197 1991 200 184 0.92 43.0
May 330 1970 2.12 1981 70.0 82.0 1.17 15.1
June 660 1970 0.366 1973 70.0 129 1.84 15.1
July 688 1975 0 1961 54.1 116 2.15 11.7
August 264 1993 0 1961 11.0 39.6 3.60 2.36
September 272 1993 0 m 16.3 50.4 3.09 3.51
Annual 112 1966 1.60 1977 38.5 29.6 0.77 100
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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 0.18 1.50 0.19 0 0 0 0 0 0 0
90 0 0 0 1.80 3.26 1.20 0.15 0 0 0 0 0 0
85 0 0 0 5.19 4.52 2.47 0.33 0 0 0 0.03 0 0
80 0 0 0 10.5 6.59 3.60 0.71 0 0 0 0.09 0.04 0.05
75 0 0 0.02 16.7 10.8 5.10 1.50 0.07 0 0 0.21 0.09 0.15
70 0.03 0 0.16 24.5 15.3 6.66 2.77 0.10 0 0.09 0.36 0.25 0.22
65 0.12 0.06 0.32 36.3 18.5 8.47 3.52 0.19 0 0.12 0.36 0.41 0.48
60 0.27 0.09 0.46 47.9 22.6 11.4 4.07 0.27 0.08 0.16 0.48 0.52 0.71
55 0.39 0.18 0.65 59.9 26.7 13.8 5.79 0.37 0.12 0.22 0.84 0.67 1.00
50 0.57 0.38 0.91 77.7 31.2 16.6 7.84 0.71 0.16 0.29 1.40 0.86 1.50
45 0.70 0.54 1.30 98.6 35.8 19.6 9.87 0.99 0.23 0.40 1.90 1.10 2.79
40 0.70 0.65 1.80 119 41.0 23.0 13.9 1.40 0.47 0.74 2.50 1.40 3.74
35 1.00 0.78 1.80 152 47.9 28.0 18.6 1.90 0.66 1.80 3.85 1.80 5.66
30 1.20 1.10 3.08 193 54.8 34.9 25.5 3.42 1.30 2.50 4.91 2.90 9.17
25 1.50 1.10 3.95 241 70.2 44.5 36.1 4.64 1.90 5.58 6.18 2.90 15.4
20 1.80 1.30 7.80 311 91.5 59.7 47.8 7.75 4.48 10.7 8.28 4.28 24.4
15 2.20 1.60 19.1 417 122 87.2 67.7 12.6 10.3 14.7 11.3 4.96 41.7
10 2.70 1.90 67.3 570 179 157 103 18.9 22.0 23.2 16.0 5.60 74.7
5 3.90 2.80 156 812 297 365 228 37.8 55.9 52.4 23.3 7.17 195
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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 16.4 15.0 11.9 8.78
0.95 1.05 104 62.9 54.6 39.8 27.3
0.90 1.11 171 117 99.5 70.2 46.9
0.80 1.25 300 229 190 130 84.7
0.50 2 771 652 520 349 221
0.20 5 1,680 1,390 1,080 732 465
0.10 10 2,380 1,860 1,440 990 635
0.04 25 3,310 2,390 1,830 1,290 839
0.02 50 4,000 2,710 2,080 1,480 978
0.01 100 4,680 2,980 2,280 1,650 1,100
0.005 200 5,340 3,200 2,450 1,800 1,220
0.002 500 6,170 ng ng ng ng
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Probability of occurrence of annual low discharges
____________________________________________________________________________________
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 0 0 0 0 0 0 0 0 0
0.10 10 0 0 0 0 0 0 0 0 0
0.20 5 0 0 0 0 0 0 0 0.043 0.093
0.50 2 0 0 0 0 0.051 0.135 0.313 0.471 0.816
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Probability of occurrence of seasonal low discharges
___________________________________________________________________________________________
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 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 0.057
0.50 2 0.246 0.249 10.252 0.255 0.317 0.353 0.472 3.67
June-July-August September-October-November
______________________________ ____________________________
0.05 20 0 0 0 0 0 0 0 0
0.10 10 0 0 0 0.015 0 0 0 0
0.20 5 0 0 0 0.086 0 0 0 0
0.50 2 0.154 0.284 0.411 0.879 0 0.026 0.070 0.209
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1Graphical interpretation.
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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
1945 March 30 10.80 939 1972 April 17 10.12 729
1950 April 15.25 2,790 1973 March 15 5.10 93.0
1951 April 9 11.75 1,220 1974 April 23 14.65 2,070
1952 April 11 9.89 612 1975 July 3 16.59 4,260
1953 March 31 6.65 112 1976 April 3 10.21 631
1954 June 18 -- 128 1977 May 28 2.50 24.0
1955 June 9 9.87 527 1978 April 10 14.45 1,320
1956 July 11 13.18 1,390 1979 April 20 15.29 2,140
1957 September 7 10.73 734 1980 April 9 6.91 357
1958 July 9 11.38 846 1981 July 3 3.97 107
1959 April 5 11.23 570 1982 April 18 9.96 711
1960 April 10 12.60 903 1983 March 9 14.17 1,020
1961 March 27 6.77 135 1984 June 12 9.10 513
1962 June 12 14.12 1,620 1985 June 29 12.58 939
1963 April 11 11.28 825 1986 March 31 13.43 1,040
1964 June 22 12.40 900 1987 March 28 11.78 550
1965 April 12 15.29 2,590 1988 June 1 7.21 357
1966 April 3 16.00 1,820 1989 April 18 15.25 1,550
1967 April 23 13.41 1,320 1990 April 4 4.86 60.0
1968 July 20 12.87 1,120 1991 July 8 -- 87.0
1969 April 11 15.92 2,530 1992 March 9 9.87 350
1970 May 31 14.82 2,200 1993 September 3 14.18 1,180
1971 April 9 11.74 773 1994 September 19 11.30 707
Annual peak discharge, from highest to lowest, and corresponding gage height
1975 July 3 16.59 4,260 1985 June 29 12.58 939
1950 April 15.25 2,790 1960 April 10 12.60 903
1965 April 12 15.29 2,590 1964 June 22 12.40 900
1969 April 11 15.92 2,530 1958 July 9 11.38 846
1970 May 31 14.82 2,200 1963 April 11 11.28 825
1979 April 20 15.29 2,140 1971 April 9 11.74 773
1974 April 23 14.65 2,070 1957 September 7 10.73 734
1966 April 3 16.00 1,820 1972 April 17 10.12 729
1962 June 12 14.12 1,620 1982 April 18 9.96 711
1989 April 18 15.25 1,550 1994 September 19 11.30 707
1956 July 11 13.18 1,390 1976 April 3 10.21 631
1967 April 23 13.41 1,320 1952 April 11 9.89 612
1978 April 10 14.45 1,320 1959 April 5 11.23 570
1951 April 9 11.75 1,220 1987 March 28 11.78 550
1993 September 3 14.18 1,180 1955 June 9 9.87 527
1968 July 20 12.87 1,120 1984 June 12 9.10 513
1986 March 31 13.43 1,040 1980 April 9 6.91 357
1983 March 9 14.17 1,020 1988 June 1 7.21 357
1945 March 30 10.80 939 1992 March 9 9.87 350
1961 March 27 6.77 135 1973 March 15 5.10 93.0
1954 June 18 -- 128 1991 July 8 -- 87.0
1953 March 31 6.65 112 1990 April 4 4.86 60.0
1981 July 3 3.97 107 1977 May 28 2.50 24.0
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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
__________________________________________________________________________________________________________________________________
1945 -- -- -- -- -- -- 289.0 73.7 26.5 15.0 4.81 19.5 --
1951 11.0 7.79 5.11 3.21 2.75 4.16 336.9 72.0 7.18 1.53 3.03 27.5 39.9
1952 11.9 4.93 3.61 1.03 1.93 3.42 177.5 19.6 3.50 6.03 0.394 0 19.3
1953 0.035 0.503 0.052 0 0 15.7 33.2 22.0 16.9 3.45 0.245 0 7.68
1954 0 0 0 0 0 0 51.8 39.8 50.7 6.26 0.190 0 12.4
1955 0.052 0.143 0.094 0.026 0 0 70.7 23.9 137.4 8.82 0.371 0 19.9
1956 0.439 0.007 0.129 0.045 0 0 132.3 131.8 26.9 312.6 11.8 7.32 52.3
1957 1.79 33.4 5.50 1.94 1.56 39.8 68.6 42.0 64.7 87.6 3.77 163.4 42.7
1958 40.6 23.5 7.41 2.50 1.70 3.76 12.2 5.32 4.85 186.7 5.28 0.153 24.8
1959 0.271 0.550 0.645 0.200 0 1.61 209.0 29.9 15.7 9.97 4.36 2.43 22.7
1960 12.5 10.4 4.31 2.10 1.11 1.68 307.1 49.9 49.2 10.4 0.887 0.223 37.1
1961 0.316 0.423 0.574 0.326 0.193 23.0 27.3 10.8 0.773 0 0 1.47 5.45
1962 8.23 2.93 0.923 0.377 0.129 0 244.9 298.9 481.9 43.9 7.34 7.60 91.2
1963 2.63 4.19 3.48 0.406 0 18.7 188.6 41.7 30.6 6.88 4.67 0.143 25.0
1964 0.013 0.177 0.032 0 0 0 73.8 44.6 306.1 40.4 28.2 8.43 41.4
1965 27.0 12.9 3.94 2.56 1.17 1.37 577.3 158.8 102.1 92.2 5.02 7.96 82.4
1966 64.5 21.6 8.54 4.05 1.92 93.0 747.1 231.9 32.7 107.2 24.2 4.74 111.7
1967 5.05 1.93 0.913 0.652 0.529 15.6 472.5 236.2 21.0 4.91 0.158 0 63.1
1968 0.535 1.63 0.600 0 0.131 26.0 19.2 4.04 232.7 205.0 28.1 27.9 45.5
1969 23.3 13.0 5.41 0.900 1.65 2.97 552.6 63.2 47.1 11.5 1.18 0.217 59.7
1970 0.174 0.423 0.481 0.358 0.036 0 302.6 330.3 659.8 25.4 2.75 0.873 109.7
1971 2.07 4.52 2.27 1.55 1.44 6.17 162.0 27.8 12.1 3.39 0.261 0.090 18.5
1972 0.703 7.67 2.82 0.361 0.059 20.6 211.8 36.0 17.4 2.22 0.019 0.023 24.7
1973 0.005 0.173 0.003 0 0 34.8 6.42 3.30 0.366 0.001 0.023 0.078 3.82
1974 1.91 2.43 0.046 0.105 0.056 0 426.2 191.7 45.0 3.01 0.493 0.351 55.7
1975 0.349 0.610 0.653 0.795 0.380 1.24 224.5 125.8 46.0 687.7 11.0 1.54 92.7
1976 1.17 4.32 1.70 1.69 1.80 21.1 189.1 16.3 3.29 1.30 0.071 0 19.9
1977 0 0 0 0 0 0.745 10.3 4.38 3.25 0.222 0.319 0.074 1.60
1978 0.079 4.46 4.04 1.24 0.831 13.4 479.2 116.7 48.9 61.3 7.11 1.07 61.2
1979 0.395 1.57 1.24 0.871 0.615 1.42 611.2 126.8 47.7 12.3 1.61 0.667 66.7
1980 0.295 1.63 1.33 1.27 1.04 2.00 112.6 6.72 0.793 0.018 0.138 0.594 10.6
1981 0.302 0.075 0.051 0.014 0.506 5.51 5.38 2.12 8.40 21.3 0.044 0.774 3.74
1982 -- -- -- -- -- 9.36 284.1 102.3 16.2 52.3 11.7 0.495 --
1983 94.1 24.0 15.8 4.65 3.32 217.1 155.7 56.7 61.3 19.7 0.999 0.313 54.8
1984 4.17 6.90 3.99 1.64 1.05 57.7 112.8 22.4 90.7 3.09 0.147 0.012 25.2
1985 0.256 0.479 0.341 0.140 0.142 68.7 83.2 41.9 253.5 74.5 29.5 35.9 49.0
1986 52.5 9.39 3.86 3.71 3.30 124.8 314.3 185.2 34.4 2.79 0.543 0.186 61.4
1987 0.478 0.829 0.600 0.600 0.600 118.2 117.1 19.6 9.06 1.57 0.340 0.023 22.5
1988 0.065 0.490 0.307 0.088 0.060 0.351 57.3 12.0 26.9 0.855 0.008 0.011 8.10
1989 0 0 0.019 0.010 0.014 0.022 231.1 28.4 28.1 2.95 0.086 0.002 24.0
1990 0 0.016 0 0 0 9.62 13.3 2.74 4.69 2.25 0.018 0 2.72
1991 0 0 0 0 0.014 0.084 0.197 4.63 3.65 40.6 3.38 0.353 4.48
1992 0.317 1.54 2.22 0.842 0.440 85.6 102.8 38.3 5.20 12.2 0.505 0.681 20.9
1993 1.23 0.465 1.25 0.754 0.691 9.01 120.4 16.1 51.6 97.9 264.5 272.4 69.8
1994 14.4 10.7 5.89 2.67 1.12 47.9 53.3 30.7 10.9 145.6 24.4 138.5 40.7
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U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:46:00 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05087500.html |
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