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Last update: Wednesday, 23-Feb-2005 09:46:13 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 343 1969 0 m 45.1 71.9 1.59 2.05
November 170 1969 0 m 24.5 36.0 1.47 1.11
December 56.9 1994 0 m 10.6 14.2 1.34 0.480
January 27.0 1994 0 m 5.30 6.90 1.30 0.240
February 44.5 1976 0 m 4.86 8.81 1.81 0.220
March 320 1985 0 m 70.5 107 1.51 3.20
April 3,110 1969 21.3 1977 821 890 1.08 37.3
May 3,620 1974 27.0 1988 669 830 1.24 30.4
June 1,510 1974 4.03 1988 274 322 1.18 12.5
July 633 1970 0.070 1988 124 135 1.09 5.62
August 719 1993 0 1988 86.1 134 1.55 3.91
September 544 1993 0 m 66.8 107 1.60 3.03
Annual 736 1974 9.61 1977 186 174 0.940 100
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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 7.15 29.2 12.1 0.62 0 0 0.05 0 0 0
90 0 0 0 23.3 46.8 22.3 2.59 0.32 0.04 0.05 0.39 0 0
85 0 0 0 45.7 62.3 31.4 7.84 0.91 0.30 1.70 2.00 0 0.29
80 0 0 0 70.8 74.8 42.3 17.8 3.20 1.10 2.40 3.00 0.50 1.60
75 0 0 0.15 96.8 90.1 68.1 28.2 7.46 3.25 4.73 3.60 1.00 2.99
70 0 0 0.56 122 120 83.8 35.8 18.6 5.24 9.10 4.95 1.60 4.32
65 0.25 0 1.50 148 175 100 43.9 28.8 18.2 13.0 5.87 2.00 8.45
60 0.58 0 3.51 187 226 118 52.4 38.3 24.5 17.3 7.03 2.50 11.9
55 1.30 0.35 5.67 248 292 138 64.7 45.3 31.1 21.8 8.52 3.20 18.4
50 1.60 0.92 8.25 320 387 162 77.9 51.3 37.1 26.1 11.4 4.39 26.1
45 3.00 1.50 10.5 457 466 188 90.7 57.3 42.7 30.4 14.1 5.18 35.3
40 3.70 1.90 12.7 580 554 216 103 67.2 48.4 35.1 17.8 6.64 46.3
35 4.59 3.10 14.5 658 634 252 121 77.7 58.0 39.8 22.2 8.93 62.8
30 5.80 3.10 19.9 786 710 297 142 89.0 67.6 45.2 25.9 11.3 84.0
25 8.48 4.80 33.4 981 829 348 164 101 80.7 52.0 30.7 14.8 112
20 10.3 8.93 50.5 1,230 993 404 190 113 93.9 58.7 36.2 20.2 167
15 13.0 12.2 79.6 1,720 1,260 502 216 140 114 70.0 40.8 23.6 276
10 17.7 14.5 142 2,410 1,700 669 317 192 137 83.4 56.5 29.8 500
5 21.7 16.8 504 3,240 2,450 978 426 304 292 244 95.3 43.5 884
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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 74.7 52.3 43.8 32.5 22.2
0.95 1.05 174 122 105 84.0 64.1
0.90 1.11 270 191 168 137 110
0.80 1.25 454 330 293 247 206
0.50 2 1,190 937 841 728 634
0.20 5 3,020 2,660 2,380 2,050 1,780
0.10 10 4,830 4,600 4,080 3,460 2,950
0.04 25 7,880 8,240 7,200 5,950 4,930
0.02 50 10,700 12,000 10,400 8,400 6,760
0.01 100 14,100 16,800 14,400 11,400 8,890
0.005 200 18,100 23,000 19,400 15,000 11,300
0.002 500 24,300 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 0.030 0.192
0.20 5 0 0 0 0 0 0 0.048 0.472 1.32
0.50 2 0.139 0.146 0.168 0.441 0.646 0.983 1.93 3.18 10.5
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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 0.246
0.20 5 0 0 0 0 0 0 0 2.37
0.50 2 0.284 0.356 0.459 0.715 1.35 2.15 2.82 15.2
June-July August September-October-November
___________________________ _____________________________
0.05 20 0 0 0 0 0 0 0 0
0.10 10 0.006 0.035 0.076 0.755 0 0 0 0.012
0.20 5 0.998 1.79 2.48 4.35 0.298 0.576 0.913 0.968
0.50 2 21.6 23.1 25.9 33.2 5.33 6.70 7.78 11.5
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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
1962 April 21 1,108.51 1,610 1979 May 2 1,116.63 5,440
1963 June 6 1,105.17 255 1980 April 6 -- 327
1964 May 10 1,105.62 323 1981 May 22 1,107.31 526
1965 April 14 1,109.75 1,460 1982 June 6 1,110.89 1,920
1966 April 3 1,110.94 1,700 1983 April 8 1,109.29 1,160
1967 April 21 1,111.06 1,890 1984 June 16 1,103.63 491
1968 March 24 1,108.51 744 1985 April 5 1,108.93 1,220
1969 April 19 1,119.31 8,170 1986 March 28 1,109.49 1,230
1970 April 28 1,115.01 3,800 1987 April 8 1,111.90 2,540
1971 April 10 1,115.04 5,910 1988 April 4 1,106.75 178
1972 April 12 -- 1,620 1989 April 16 1,106.79 441
1973 August 8 -- 145 1990 April 3 1,108.50 794
1974 April 26 1,121.52 11,500 1991 July 12 1,107.33 487
1975 May 14 1,109.76 1,510 1992 April 8 1,113.73 3,080
1976 April 17 1,115.13 4,210 1993 July 28 1,109.73 1,140
1977 May 21 1,105.47 153 1994 April 13 1,109.94 1,380
1978 April 9 1,110.88 1,090
Annual peak discharge, from highest to lowest, and corresponding gage height
1974 April 26 1,121.52 11,500 1985 April 5 1,108.93 1,220
1969 April 19 1,119.31 8,170 1983 April 8 1,109.29 1,160
1971 April 10 1,115.04 5,910 1993 July 28 1,109.73 1,140
1979 May 2 1,116.63 5,440 1978 April 9 1,110.88 1,090
1976 April 17 1,115.13 4,210 1990 April 3 1,108.50 794
1970 April 28 1,115.01 3,800 1968 March 24 1,108.51 744
1992 April 8 1,113.73 3,080 1981 May 22 1,107.31 526
1987 April 8 1,111.90 2,540 1984 June 16 1,103.63 491
1982 June 6 1,110.89 1,920 1991 July 12 1,107.33 487
1967 April 21 1,111.06 1,890 1989 April 16 1,106.79 441
1966 April 3 1,110.94 1,700 1980 April 6 -- 327
1972 April 12 -- 1,620 1964 May 10 1,105.62 323
1962 April 21 1,108.51 1,610 1963 June 6 1,105.17 255
1975 May 14 1,109.76 1,510 1988 April 4 1,106.75 178
1965 April 14 1,109.75 1,460 1977 May 21 1,105.47 153
1994 April 13 1,109.94 1,380 1973 August 8 -- 145
1986 March 28 1,109.49 1,230
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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
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U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:46:13 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05099300.html |
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