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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 343 1969 0 m 56.6 84.7 1.50 2.03
November 391 1995 0 m 36.6 70.9 1.94 1.31
December 195 1995 0 m 16.8 34.1 2.02 0.60
January 82.7 1995 0 m 8.39 15.0 1.78 0.30
February 64.9 1995 0 m 7.33 13.4 1.83 0.26
March 949 1995 0 m 92.7 181 1.95 3.33
April 4,240 1995 21.3 1977 1,050 1,150 1.10 37.6
May 3,620 1974 27.0 1988 851 1,010 1.19 30.6
June 1,510 1974 4.03 1988 325 357 1.10 11.7
July 1,130 1997 0.070 1988 161 215 1.33 5.79
August 719 1993 0 1988 109 156 1.43 3.92
September 544 1993 0 m 73.4 105 1.43 2.64
Annual 936 1995 9.61 1977 236 239 1.01 100
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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 8.70 29.9 13.0 0.66 0 0 0 0 0 0
90 0 0 0 21.8 50.2 24.0 3.21 0.45 0.04 0.10 0.63 0 0
85 0 0 0 41.8 65.3 33.7 11.1 1.40 0.59 2.10 2.40 0.12 0.46
80 0 0 0 68.4 80.0 49.4 20.8 4.66 1.60 3.51 3.00 0.75 1.70
75 0 0 0.43 94.6 101 75.5 31.3 11.0 3.97 6.81 4.55 1.70 3.91
70 0 0 1.20 124 156 92.1 39.2 24.6 13.9 12.0 5.46 2.20 6.50
65 0.44 0 2.30 153 208 111 49.5 34.7 22.7 15.8 6.51 2.20 10.9
60 1.10 0.28 4.86 196 271 132 62.2 44.0 29.6 20.4 8.01 2.80 16.5
55 1.50 0.72 7.69 269 359 158 74.5 50.9 36.1 25.2 10.6 4.28 22.5
50 2.30 1.50 10.2 361 466 185 86.7 57.7 42.2 30.1 14.0 5.16 30.7
45 4.08 1.90 11.8 518 562 216 102 65.7 48.4 35.3 18.0 6.64 41.5
40 4.71 3.10 14.0 642 637 256 120 77.4 59.0 40.4 22.7 9.20 55.0
35 6.22 3.10 16.7 745 734 305 140 89.1 70.1 46.7 26.9 12.3 74.4
30 8.82 6.63 24.4 914 861 361 167 106 84.4 54.1 32.4 16.5 101
25 11.3 10.8 33.5 1,170 1,060 418 193 125 98.9 62.6 38.4 20.5 139
20 16.4 13.4 50.4 1,590 1,370 517 242 155 114 75.6 43.5 24.1 210
15 18.6 15.3 80.8 2,320 1,840 655 299 198 129 91.3 54.3 29.1 341
10 21.5 17.5 159 2,990 2,250 859 386 260 163 111 68.6 36.9 583
5 25.7 21.9 568 4,370 3,220 1,160 589 403 287 278 162 57.5 1,140
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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 71.3 49.2 41.6 31.3 21.7
0.95 1.05 176 124 108 86.4 66.9
0.90 1.11 283 202 178 147 118
0.80 1.25 496 366 325 274 230
0.50 2 1,410 1,130 1,020 878 762
0.20 5 3,870 3,500 3,130 2,680 2,290
0.10 10 6,450 6,300 5,610 4,710 3,910
0.04 25 11,000 110,800 10,400 8,490 6,740
0.02 50 15,400 115,200 114,500 12,300 9,430
0.01 100 20,800 120,500 119,800 17,100 12,600
0.005 200 27,400 127,000 126,000 23,100 16,400
0.002 500 37,800 ng ng ng ng
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1Statistical adjustment based on correlation between 3-, 7-, 15-,
and 30-consecutive-day periods.
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Annual peak discharge and corresponding gage height, period of record
[--, 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
1962 April 21 1,108.51 1,610 1980 April 6 -- 327
1963 June 6 1,105.17 255 1981 May 22 1,107.31 526
1964 May 10 1,105.62 323 1982 June 6 1,110.89 1,920
1965 April 14 1,109.75 1,460 1983 April 8 1,109.29 1,160
1966 April 3 1,110.94 1,700 1984 June 16 1,103.63 491
1967 April 21 1,111.06 1,890 1985 April 5 1,108.93 1,220
1968 March 24 1,108.51 744 1986 March 28 1,109.49 1,230
1969 April 19 1,119.31 8,170 1987 April 8 1,111.90 2,540
1970 April 28 1,115.01 3,800 1988 April 4 1,106.75 178
1971 April 10 1,115.04 5,910 1989 April 16 1,106.79 441
1972 April 12 -- 1,620 1990 April 3 1,108.50 794
1973 August 8 -- 145 1991 July 12 1,107.33 487
1974 April 26 1,121.52 11,500 1992 April 8 1,113.73 3,080
1975 May 14 1,109.76 1,510 1993 July 28 1,109.73 1,140
1976 April 17 1,115.13 4,210 1994 April 13 1,109.94 1,380
1977 May 21 1,105.47 153 1995 April 21 1,119.50 7,420
1978 April 9 1,110.88 1,090 1996 April 25 1,118.40 6,570
1979 May 2 1,116.63 5,440 1997 April 26 1,122.27 13,700
Annual peak discharge, from highest to lowest, and corresponding gage height
1997 April 26 1,122.27 13,700 1994 April 13 1,109.94 1,380
1974 April 26 1,121.52 11,500 1986 March 28 1,109.49 1,230
1969 April 19 1,119.31 8,170 1985 April 5 1,108.93 1,220
1995 April 21 1,119.50 7,420 1983 April 8 1,109.29 1,160
1996 April 25 1,118.40 6,570 1993 July 28 1,109.73 1,140
1971 April 10 1,115.04 5,910 1978 April 9 1,110.88 1,090
1979 May 2 1,116.63 5,440 1990 April 3 1,108.50 794
1976 April 17 1,115.13 4,210 1968 March 24 1,108.51 744
1970 April 28 1,115.01 3,800 1981 May 22 1,107.31 526
1992 April 8 1,113.73 3,080 1984 June 16 1,103.63 491
1987 April 8 1,111.90 2,540 1991 July 12 1,107.33 487
1982 June 6 1,110.89 1,920 1989 April 16 1,106.79 441
1967 April 21 1,111.06 1,890 1980 April 6 -- 327
1966 April 3 1,110.94 1,700 1964 May 10 1,105.62 323
1972 April 12 -- 1,620 1963 June 6 1,105.17 255
1962 April 21 1,108.51 1,610 1988 April 4 1,106.75 178
1975 May 14 1,109.76 1,510 1977 May 21 1,105.47 153
1965 April 14 1,109.75 1,460 1973 August 8 -- 145
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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
__________________________________________________________________________________________________________________________________
1962 -- -- -- -- -- -- 421.2 204.9 155.8 54.9 77.4 96.0 --
1963 38.5 16.9 23.4 9.85 0 40.9 135.0 166.3 182.4 96.3 97.9 60.8 72.6
1964 27.3 11.5 3.35 0.816 0 0 231.6 282.8 120.4 35.5 44.4 34.1 66.0
1965 23.1 8.05 1.13 0 0 0 460.4 646.1 382.4 125.1 56.4 80.4 148.9
1966 63.0 40.2 29.4 12.3 2.26 143.4 1,032 696.9 283.5 132.5 65.9 25.8 210.8
1967 10.7 6.41 2.69 4.71 3.46 31.0 596.7 654.7 214.2 63.5 16.4 0.587 134.0
1968 17.2 9.26 2.94 0.444 0 264.1 129.2 69.8 30.6 18.5 112.4 325.4 81.6
1969 343.0 170.5 45.3 19.1 14.1 15.6 3,112 1,538 476.4 289.5 153.9 88.8 521.6
1970 60.3 42.3 22.3 15.0 12.4 12.0 1,095 1,868 1,075 633.2 260.5 130.8 437.4
1971 76.0 42.8 14.4 9.42 9.60 11.4 2,026 1,299 465.6 343.7 292.0 141.4 394.4
1972 81.3 57.4 37.3 18.7 13.9 270.6 1,205 774.7 314.2 197.5 164.5 97.3 269.1
1973 72.3 28.5 5.05 2.86 3.01 56.3 74.4 49.4 33.0 45.8 50.9 45.1 39.1
1974 50.7 32.7 14.7 8.74 11.2 11.8 3,003 3,616 1,512 368.1 116.2 76.8 736.5
1975 44.1 33.3 13.2 6.51 3.72 6.87 256.9 1,175 547.4 190.5 72.2 35.2 200.1
1976 29.7 21.0 8.98 11.5 44.5 41.2 2,630 1,303 378.4 114.5 42.7 25.3 385.4
1977 19.4 8.78 0.223 0 0 2.90 21.3 34.7 18.9 4.96 0.312 3.30 9.61
1978 8.55 2.36 0.798 0.242 0 2.42 616.1 368.2 112.7 48.3 30.6 23.2 101.0
1979 12.1 5.32 2.68 0.953 0.235 1.06 1,352 2,934 743.7 194.5 50.4 45.4 447.9
1980 39.2 28.7 9.40 1.87 0.660 1.35 149.2 76.8 22.7 1.54 1.41 0.988 27.7
1981 1.84 4.65 2.56 0 6.04 51.8 189.9 98.4 26.9 10.8 3.26 1.19 33.1
1982 2.62 3.09 0.816 0 0 11.9 426.5 589.5 454.6 187.4 91.7 46.3 151.5
1983 42.0 19.2 7.05 3.58 0.933 45.0 686.7 427.5 175.2 61.6 13.9 4.88 123.9
1984 10.1 5.86 1.75 0.019 0.189 7.34 69.2 78.0 97.2 13.7 0.916 0.061 23.6
1985 0.712 0.769 0.187 0 0 320.2 666.7 198.5 94.7 49.0 18.1 24.1 114.5
1986 30.2 15.7 5.27 6.21 3.03 280.0 654.7 611.5 303.6 116.3 85.1 49.6 180.7
1987 24.6 9.73 4.83 4.16 2.95 5.22 1,552 685.3 175.2 51.1 36.9 53.8 216.4
1988 49.7 24.1 15.3 0.247 0.166 17.6 65.9 27.0 4.03 0.070 0 0 17.0
1989 0 0 0 0 0 0 119.4 72.7 25.7 1.25 0.004 0 18.2
1990 0 0 0 0 0 16.3 230.3 86.3 88.0 29.4 0.977 0.100 37.5
1991 0 0 0 0 0.084 14.4 49.0 29.9 108.1 196.9 70.1 10.2 40.2
1992 5.86 6.29 5.28 3.64 4.67 279.7 2,391 731.7 155.3 49.1 9.16 2.88 301.7
1993 3.27 3.32 1.76 1.87 1.17 18.6 393.9 196.8 94.7 233.1 719.1 543.5 184.9
1994 257.0 124.3 56.9 27.0 17.4 275.4 1,043 482.2 176.0 122.1 85.0 130.1 233.4
1995 330.3 390.6 195.1 82.7 64.9 949.0 4,241 2,666 1,173 374.8 572.5 183.0 936.2
1996 95.0 50.5 25.5 18.7 17.7 23.3 2,745 2,304 708.1 224.7 218.8 137.3 546.3
1997 109.8 54.7 28.8 22.1 17.6 16.2 3,601 3,596 767.4 1,128 298.4 119.2 816.3
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U.S. Geological Survey Maintainer: Webmaster Last update: Tuesday, 24-Aug-2004 12:38:24 EDT Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr00344/htdocs/ff.05099300.html |
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