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Statistics of monthly and annual mean discharges
__________________________________________________________________________________________________________
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 470 1972 1.02 1991 45.1 83.8 1.86 5.37
November 232 1972 1.11 1977 29.9 40.2 1.35 3.56
December 56.6 1978 0.050 1977 13.4 11.3 0.85 1.59
January 19.8 1986 0.002 1977 7.94 5.72 0.72 0.95
February 25.8 1984 0 1977 7.65 5.92 0.77 0.91
March 242 1986 0.190 1964 71.0 66.5 0.94 8.46
April 745 1966 29.5 1991 293 234 0.80 34.9
May 622 1962 10.5 1980 127 120 0.94 15.1
June 657 1962 8.20 1980 87.8 115 1.31 10.5
July 442 1962 1.99 1961 78.4 104 1.33 9.34
August 351 1985 1.17 1961 40.9 75.6 1.85 4.87
September 330 1973 0 1990 37.4 62.1 1.66 4.45
Annual 177 1962 18.2 1990 69.7 39.9 0.57 100
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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 0.19 0 0.09 22.6 10.6 5.64 2.30 0.40 0.23 1.30 1.50 0.74 0.66
90 0.50 0.18 1.60 29.1 17.4 7.70 3.96 0.83 0.71 1.80 2.50 2.20 2.27
85 1.70 0.46 3.23 37.0 22.0 11.4 5.10 1.20 1.60 3.36 5.75 2.80 3.40
80 2.20 1.70 6.14 47.1 27.7 14.0 6.24 1.70 2.90 4.28 7.37 3.92 5.28
75 2.20 2.60 7.81 58.0 32.9 16.6 8.89 3.60 4.16 6.62 9.41 4.65 7.09
70 2.80 2.60 8.82 75.0 38.4 19.6 11.7 4.17 5.36 7.95 11.1 5.32 8.59
65 4.10 3.70 9.83 92.0 45.4 23.6 14.6 5.48 7.04 10.0 13.2 6.37 10.3
60 4.98 5.89 11.3 106 54.5 28.1 17.4 6.67 8.85 11.9 15.6 6.91 12.5
55 6.04 6.93 13.0 122 65.4 32.9 20.2 8.79 10.9 15.5 18.2 8.69 15.2
50 7.56 8.02 15.2 141 76.1 37.2 23.1 11.4 13.3 18.1 20.6 10.1 17.9
45 8.53 8.29 18.4 166 85.5 42.8 27.7 13.8 15.6 20.3 23.0 12.9 20.6
40 9.47 8.55 22.2 199 95.0 51.8 32.8 16.4 18.3 22.5 25.6 14.9 25.2
35 10.3 8.82 28.8 236 110 64.2 39.1 19.9 21.5 25.9 28.4 16.6 30.3
30 11.1 9.94 41.6 285 129 78.5 48.5 23.7 25.5 32.1 31.4 18.4 39.2
25 12.6 10.7 62.3 353 153 98.1 62.0 29.1 30.8 40.0 34.6 20.0 52.5
20 13.6 11.5 94.1 435 181 118 84.6 36.3 38.8 50.5 37.8 21.7 74.6
15 14.6 14.6 134 514 220 148 127 50.7 57.1 65.9 44.2 23.3 109
10 16.5 15.9 200 705 280 201 200 84.1 93.7 95.7 55.0 26.9 166
5 18.9 17.8 318 1,200 441 355 370 150 158 166 81.6 32.0 298
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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 1.01 124 103 90.4 63.8 48.8
0.95 1.05 258 207 170 120 88.4
0.90 1.11 371 293 234 165 120
0.80 1.25 562 436 339 238 170
0.50 2 1,150 878 656 460 321
0.20 5 2,120 1,630 1,200 835 576
0.10 10 2,810 2,180 1,600 1,110 765
0.04 25 3,710 2,920 2,150 1,490 1,020
0.02 50 4,370 3,470 2,580 1,780 1,220
0.01 100 5,020 4,030 3,020 2,070 1,430
0.005 200 5,650 4,590 3,470 2,370 1,640
0.002 500 6,470 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 0.102 0.278 0.592 1.27
0.10 10 0 0 0 0 0.032 0.385 0.855 1.35 2.32
0.20 5 0.171 0.206 0.282 0.408 0.558 1.12 2.10 3.11 4.51
0.50 2 1.31 1.51 1.85 2.44 3.48 4.59 6.68 9.70 13.1
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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 0.063 0 0 0.047 2.01
0.10 10 0.080 0.078 0.082 0.303 0.155 0.435 11.00 4.44
0.20 5 1.00 1.04 1.07 11.10 1.25 1.63 13.00 10.0
0.50 2 4.91 5.18 5.27 15.40 5.53 7.32 115.0 31.4
June-July-August September-October-November
_____________________________ ____________________________
0.05 20 0.052 0.238 0.483 1.51 0.054 0.082 0.226 0.517
0.10 10 0.164 0.442 0.800 2.14 0.200 0.307 0.678 1.28
0.20 5 0.466 0.910 1.46 3.33 0.615 0.940 1.72 2.83
0.50 2 2.33 3.31 4.47 8.28 3.22 4.64 6.56 9.29
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1Graphical interpretation.
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Annual peak discharge and corresponding gage height
[--, no data]
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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
1950 April 21 18.39 2,790 1978 April 9 16.64 3,140
1961 April 23 14.34 279 1979 April 20 14.63 2,140
1962 May 24 18.72 1,490 1980 April 3 9.95 670
1963 June 4 15.13 355 1981 September 8 12.98 1,560
1964 April 16 16.07 472 1982 April 16 12.04 1,320
1965 April 12 11.12 1,780 1983 March 7 13.29 520
1966 April 2 12.60 2,240 1984 June 9 9.13 626
1967 March 31 14.17 2,880 1985 August 18 15.03 2,320
1968 July 17 7.35 551 1986 March 30 13.50 1,720
1969 April 11 14.91 3,210 1987 July 24 9.00 661
1970 April 25 12.76 2,300 1988 April 4 9.68 620
1971 April 8 12.34 1,430 1989 April 6 13.57 940
1972 April 15 13.98 2,070 1990 June 21 5.89 134
1973 September 4 11.27 1,030 1991 September 10 6.60 247
1974 August 15 12.91 2,270 1992 March 9 12.33 500
1975 April 19 14.66 2,120 1993 March 30 12.47 1,000
1976 March 31 11.70 920 1994 July 8 -- 1,270
1977 July 3 9.40 855
Annual peak discharge, from highest to lowest, and corresponding gage height
1969 April 11 14.91 3,210 1973 September 4 11.27 1,030
1978 April 9 16.64 3,140 1993 March 30 12.47 1,000
1967 March 31 14.17 2,880 1989 April 6 13.57 940
1950 April 21 18.39 2,790 1976 March 31 11.70 920
1985 August 18 15.03 2,320 1977 July 3 9.40 855
1970 April 25 12.76 2,300 1980 April 3 9.95 670
1974 August 15 12.91 2,270 1987 July 24 9.00 661
1966 April 2 12.60 2,240 1984 June 9 9.13 626
1979 April 20 14.63 2,140 1988 April 4 9.68 620
1975 April 19 14.66 2,120 1968 July 17 7.35 551
1972 April 15 13.98 2,070 1983 March 7 13.29 520
1965 April 12 11.12 1,780 1992 March 9 12.33 500
1986 March 30 13.50 1,720 1964 April 16 16.07 472
1981 September 8 12.98 1,560 1963 June 4 15.13 355
1962 May 24 18.72 1,490 1961 April 23 14.34 279
1971 April 8 12.34 1,430 1991 September 10 6.60 247
1982 April 16 12.04 1,320 1990 June 21 5.89 134
1994 July 8 -- 1,270
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1Gage height recorded using datum 8 feet higher.
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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
__________________________________________________________________________________________________________________________________
1960 -- -- -- -- -- -- 172.2 65.6 198.0 79.2 1.85 1.52 --
1961 2.93 8.82 7.31 1.81 0.389 32.5 109.6 68.3 10.6 1.99 1.17 16.6 21.8
1962 14.6 13.5 4.64 2.70 1.99 8.03 265.3 622.0 656.9 442.3 39.3 45.4 177.1
1963 18.8 24.0 12.7 2.37 0.104 32.0 147.7 87.2 141.2 41.8 4.44 7.08 43.2
1964 2.71 1.81 1.25 0.203 0.048 0.190 223.5 127.6 94.2 22.3 4.48 39.7 42.9
1965 30.1 18.3 5.28 5.11 3.34 2.88 537.9 237.1 249.9 40.1 8.43 18.2 95.9
1966 65.8 35.8 22.6 6.50 2.70 80.6 744.8 210.5 39.9 9.46 31.3 11.4 104.8
1967 9.29 9.87 6.16 6.72 8.95 142.1 345.9 175.0 98.7 23.2 2.99 1.27 69.2
1968 2.50 2.94 4.39 1.35 0.276 133.8 120.1 57.5 91.8 124.5 6.92 13.4 46.8
1969 22.1 14.3 10.9 8.91 10.8 9.34 590.5 153.2 66.8 26.3 36.0 19.0 80.3
1970 77.2 55.7 21.2 12.2 9.57 11.6 571.1 235.0 134.2 8.78 3.14 7.46 95.2
1971 21.2 44.3 14.4 7.47 7.76 28.0 342.6 62.0 25.4 22.5 21.2 57.1 54.2
1972 470.0 231.8 31.2 12.2 9.28 165.0 502.5 217.1 45.7 32.8 30.4 18.7 147.4
1973 20.4 22.3 5.21 4.11 7.63 179.3 66.4 42.5 9.82 7.55 31.2 330.3 60.5
1974 146.5 43.6 20.9 16.1 16.9 20.4 677.2 270.7 66.3 8.68 281.4 17.4 132.4
1975 24.5 34.8 18.1 14.4 15.0 20.4 677.4 217.8 80.2 275.3 14.1 5.22 116.4
1976 7.71 12.7 2.49 2.69 5.70 77.3 186.5 21.9 19.6 20.0 8.42 0.826 30.4
1977 2.22 1.11 0.050 0.002 0 15.5 48.9 16.7 17.0 75.4 6.93 83.5 22.3
1978 73.7 74.3 56.6 16.6 7.54 21.9 726.3 64.7 25.3 22.9 10.9 15.4 92.4
1979 7.71 6.40 4.11 2.09 2.87 19.5 677.9 132.5 94.0 148.1 72.5 8.54 97.7
1980 16.8 22.2 13.4 11.2 10.0 12.4 213.7 10.5 8.20 3.49 7.34 8.43 27.8
1981 12.9 19.7 3.26 2.75 8.70 26.4 29.6 16.9 23.3 60.0 72.9 171.1 37.3
1982 -- -- -- -- -- 45.8 512.5 272.0 36.8 98.0 10.3 3.16 --
1983 82.9 22.5 15.4 11.1 11.7 164.4 97.2 71.6 113.6 66.9 28.9 19.2 59.1
1984 51.1 32.2 17.8 14.0 25.8 78.2 103.4 22.0 113.0 14.6 2.30 1.74 39.5
1985 86.4 55.9 11.8 5.44 5.55 164.8 148.0 239.0 130.6 204.8 350.5 61.9 123.3
1986 100.8 33.9 27.6 19.8 16.0 241.6 370.4 190.0 22.5 16.0 7.10 14.6 88.7
1987 12.4 9.27 8.34 7.51 8.77 175.2 45.8 137.4 26.8 105.9 32.9 17.3 49.6
1988 17.2 35.4 19.3 14.5 6.94 76.9 189.3 24.0 12.3 4.44 2.59 2.26 33.6
1989 3.86 8.45 8.74 8.69 8.00 13.7 369.0 66.9 60.0 33.7 2.12 6.65 48.8
1990 3.82 10.0 4.61 2.70 2.91 39.8 46.7 24.7 54.3 18.7 9.51 0 18.2
1991 1.02 1.77 1.05 0.246 0.684 20.0 29.5 73.2 27.9 85.1 17.9 67.5 27.3
1992 24.7 21.3 22.7 17.2 15.9 113.8 83.9 39.8 12.9 29.4 65.0 90.8 44.9
1993 20.4 33.1 18.9 11.3 9.32 116.9 160.0 52.5 101.7 204.7 154.7 57.1 78.8
1994 34.5 24.6 18.1 11.9 11.2 123.1 130.3 111.1 163.9 364.3 50.8 67.7 93.3
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U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:45:53 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05078230.html |
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