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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 11.8 1983 0.432 1991 2.47 2.48 1.00 2.60
November 10.4 1983 0.265 1977 2.15 1.69 0.78 2.26
December 6.27 1983 0.090 1962 0.910 1.03 1.12 0.96
January 4.10 1983 m 1959 0.480 0.89 1.86 0.50
February 26.7 1983 m 1956 2.61 5.56 2.13 2.75
March 123 1982 0 1969 25.8 30.7 1.19 27.1
April 100 1969 2.13 1991 28.4 31.0 1.09 29.9
May 62.1 1984 1.59 1977 13.3 15.5 1.16 14.0
June 54.0 1971 0.303 1961 7.52 9.53 1.27 7.91
July 58.9 1993 0.071 1961 7.00 12.7 1.82 7.36
August 25.6 1985 m 1959 2.68 5.28 1.97 2.82
September 4.79 1977 0.061 1976 1.72 1.32 0.77 1.81
Annual 28.3 1982 0.760 1961 7.94 6.52 0.82 100
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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 1.70 1.10 0.53 0.08 0 0.07 0.37 0.48 0 0
90 0 0 0 2.10 1.50 0.80 0.29 0 0.21 0.44 0.62 0 0
85 0 0 0 2.60 1.80 0.99 0.39 0.14 0.36 0.64 0.80 0.09 0.18
80 0 0 0.19 2.60 2.10 1.20 0.53 0.25 0.43 0.77 1.00 0.14 0.34
75 0 0 0.40 3.20 2.50 1.50 0.72 0.33 0.52 1.10 1.00 0.17 0.47
70 0 0 0.85 3.90 2.50 1.80 0.72 0.45 0.62 1.10 1.20 0.26 0.64
65 0 0 1.40 3.90 3.00 1.80 0.97 0.60 0.74 1.10 1.30 0.40 0.88
60 0 0 2.30 5.61 3.60 2.30 1.30 0.60 0.89 1.30 1.30 0.50 0.88
55 0 0 2.90 6.93 4.20 2.80 1.30 0.80 0.89 1.30 1.50 0.50 1.20
50 0.09 0.09 4.71 11.3 6.04 2.80 1.80 0.80 1.10 1.30 1.70 0.62 1.20
45 0.19 0.20 5.51 15.7 7.27 3.50 2.40 0.80 1.30 1.60 1.70 0.62 1.70
40 0.23 0.20 7.13 19.9 8.63 4.30 2.40 1.10 1.30 1.60 1.90 0.77 1.70
35 0.28 0.34 13.0 24.9 10.7 5.63 3.45 1.10 1.50 1.60 1.90 0.77 2.30
30 0.42 0.45 20.0 32.1 13.5 6.78 3.97 1.40 1.50 1.90 2.20 0.96 3.33
25 0.42 0.78 28.7 39.0 17.4 8.08 4.80 1.40 1.80 2.30 2.20 1.20 4.14
20 0.51 1.00 41.9 46.6 21.7 10.4 6.32 1.90 2.20 2.80 2.50 1.20 6.16
15 0.75 1.80 64.5 57.7 26.1 14.2 8.45 2.60 2.60 3.40 2.80 1.50 9.56
10 1.10 4.13 92.8 75.7 35.2 18.4 16.0 4.60 3.10 4.10 3.70 1.50 19.0
5 2.40 13.8 133 110 53.4 27.4 27.9 9.94 4.50 8.59 5.40 2.80 40.5
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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 5.50 3.44 2.71 2.02 1.64
0.95 1.05 14.3 9.76 7.70 5.51 4.15
0.90 1.11 23.2 16.3 12.9 9.09 6.65
0.80 1.25 40.4 29.3 23.0 16.1 11.5
0.50 2 108 79.9 62.3 44.0 30.7
0.20 5 264 189 145 106 75.5
0.10 10 406 282 214 161 117
0.04 25 625 414 311 243 182
0.02 50 813 520 387 312 239
0.01 100 1,020 631 466 386 302
0.005 200 1,250 744 545 464 373
0.002 500 1,580 ng ng ng ng
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Probability of annual low discharges
____________________________________________________________________________________
Minimum average 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 0.117 0.348
0.10 10 0 0 0 0 0 0 0.020 0.175 0.440
0.20 5 0 0 0 0 0 0 0.074 0.279 0.588
0.50 2 0 0 0 0 0 0.103 0.307 0.642 1.04
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Probability of seasonal low discharges
_____________________________________________________________________________________________
Minimum average 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 0.279
0.10 10 0 0 0 0 0 0 0 0.629
0.20 5 0 0 0 0 0 0 0.132 1.36
0.50 2 0 0 0 0 0.279 0.521 1.52 4.53
June-July-August September-October-November
___________________________ _____________________________
0.05 20 0 0 0 0 0 0 0.048 0.179
0.10 10 0 0 0 0.067 0.068 0.086 0.125 0.286
0.20 5 0 0.082 0.175 0.217 0.171 0.239 0.282 0.475
0.50 2 0.324 0.411 0.546 0.962 0.441 0.618 0.794 1.05
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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)
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Annual peak discharge, by year, and corresponding gage height
1956 April 11 8.92 224 1976 March 20 -- 220
1957 March 23 8.14 26.0 1977 September 24 5.51 20.0
1958 June 30 7.26 58.0 1978 March 27 8.78 148
1959 March 28 5.70 15.0 1979 April 20 9.45 1,000
1960 March 27 8.94 209 1980 August 20 6.33 34.0
1961 April 5 5.19 14.0 1981 June 16 7.15 53.0
1962 March 24 8.51 110 1982 April 3 -- 410
1963 June 8 7.32 65.0 1983 March 13 9.57 240
1964 April 1 8.18 54.0 1984 April 14 8.38 145
1965 April 9 8.43 95.0 1985 August 19 8.80 224
1966 March 15 9.21 410 1986 March 4 9.16 180
1967 March 26 9.94 300 1987 July 24 9.08 434
1968 March 7 7.59 62.0 1988 March 26 -- 80.0
1969 April 11 9.45 370 1989 March 29 7.95 70.0
1970 April 6 7.74 58.0 1990 September 29 5.81 18.0
1971 April 2 10.25 300 1991 September 23 -- 10.0
1972 March 15 9.09 177 1992 March 2 8.27 55.0
1973 February 27 9.41 18.0 1993 July 28 9.67 224
1974 May 20 8.36 160 1994 March 24 9.04 210
1975 April 29 -- 160
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 20 9.45 1,000 1962 March 24 8.51 110
1987 July 24 9.08 434 1965 April 9 8.43 95.0
1966 March 15 9.21 410 1988 March 26 -- 80.0
1982 April 3 -- 410 1989 March 29 7.95 70.0
1969 April 11 9.45 370 1963 June 8 7.32 65.0
1967 March 26 9.94 300 1968 March 7 7.59 62.0
1971 April 2 10.25 300 1958 June 30 7.26 58.0
1983 March 13 9.57 240 1970 April 6 7.74 58.0
1956 April 11 8.92 224 1992 March 2 8.27 55.0
1985 August 19 8.80 224 1964 April 1 8.18 54.0
1993 July 28 9.67 224 1981 June 16 7.15 53.0
1976 March 20 -- 220 1980 August 20 6.33 34.0
1994 March 24 9.04 210 1957 March 23 8.14 26.0
1960 March 27 8.94 209 1977 September 24 5.51 20.0
1986 March 4 9.16 180 1973 February 27 9.41 18.0
1972 March 15 9.09 177 1990 September 29 5.81 18.0
1974 May 20 8.36 160 1959 March 28 5.70 15.0
1975 April 29 -- 160 1961 April 5 5.19 14.0
1978 March 27 8.78 148 1991 September 23 -- 10.0
1984 April 14 8.38 145
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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]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1956 1.41 1.05 0.265 0.113 0 11.0 69.3 19.1 19.2 3.49 0.910 1.58 10.5
1957 1.32 2.77 0.377 0.152 0 5.39 4.25 4.27 2.39 1.58 1.05 2.11 2.15
1958 2.56 2.46 1.10 0.635 3.57 7.15 4.97 2.38 2.07 6.94 0.100 0.443 2.86
1959 1.07 1.50 0.103 0 0 6.50 2.99 2.58 1.13 0.406 0 0.190 1.38
1960 5.95 0.980 0.897 0.316 0 30.6 5.76 6.69 3.40 0.181 0.923 0.743 4.75
1961 0.555 0.710 0.168 0.035 0.193 1.80 3.09 1.64 0.303 0.071 0.029 0.560 0.763
1962 0.474 0.810 0.090 0 0 14.2 3.21 6.54 5.56 5.78 0.761 0.680 3.21
1963 1.10 1.53 0.800 0.045 0 2.87 3.79 4.37 6.73 1.58 0.984 0.310 2.01
1964 0.852 0.983 0.219 0.013 0.031 0.081 10.0 3.42 8.30 2.55 0.952 1.76 2.42
1965 1.40 1.61 0.097 0 0 3.38 26.7 5.49 1.82 4.02 0.994 2.55 3.99
1966 2.25 1.52 1.69 0 0 61.4 4.89 3.43 3.01 9.32 1.07 0.456 7.53
1967 1.06 1.73 0.161 0 0 36.2 28.9 28.7 2.49 0.559 0 0.168 8.40
1968 1.31 1.58 0.523 0.008 0.046 10.3 4.07 5.75 1.65 1.11 2.01 2.02 2.55
1969 1.54 1.94 0.436 0 0 0 100.5 15.2 2.52 3.04 1.33 0.921 10.5
1970 1.25 1.32 1.24 0.343 0.202 0.628 19.8 14.8 7.41 3.81 1.64 1.39 4.49
1971 1.80 2.15 0.790 0.162 0.204 6.14 90.5 14.3 54.0 9.01 1.84 1.34 15.1
1972 4.18 2.49 0.908 0.001 0 61.2 25.8 13.9 3.09 1.09 0.813 0.710 9.59
1973 1.57 2.32 0.742 2.32 5.86 6.15 5.11 2.25 1.81 0.780 0.720 1.09 2.53
1974 2.53 1.39 0.166 0 0.896 15.6 22.4 54.4 17.5 0.759 0.368 0.940 9.82
1975 1.38 1.92 1.05 0.177 0.429 13.2 72.5 50.2 14.6 18.7 1.04 1.75 14.8
1976 2.10 1.92 0.739 0.423 2.04 71.1 49.8 8.64 1.78 0.418 0.074 0.061 11.6
1977 0.990 0.265 0.134 0 0 3.73 2.66 1.59 0.869 1.02 0.800 4.79 1.41
1978 2.89 1.32 0.310 0.250 0.341 34.8 15.9 7.76 3.71 2.94 0.333 0.600 5.98
1979 1.21 1.26 1.02 0.303 0.368 0.689 74.3 41.7 9.32 13.6 4.67 1.08 12.5
1980 1.31 1.83 1.43 0.939 0.500 9.27 19.1 3.55 2.15 1.29 6.64 3.90 4.32
1981 5.22 5.92 2.55 0.003 12.9 36.9 13.9 7.02 17.1 5.22 1.61 3.57 9.29
1982 2.06 1.86 1.43 0.153 19.1 123.1 98.7 25.8 17.6 43.4 5.35 0.727 28.3
1983 11.8 10.4 6.27 4.10 26.7 111.3 54.7 28.6 8.43 3.48 1.60 1.66 22.4
1984 1.45 2.48 0.879 3.19 6.68 44.8 93.4 62.1 18.1 3.34 3.24 4.29 20.3
1985 4.37 3.36 0.661 0 7.61 24.8 25.2 9.96 4.22 5.70 25.6 4.39 9.68
1986 11.2 2.89 0.682 0.561 3.45 81.4 45.9 24.9 6.07 2.81 1.73 2.53 15.4
1987 3.69 2.54 1.09 1.29 3.01 48.5 41.8 13.2 10.4 41.0 5.71 2.24 14.6
1988 1.83 1.46 0.667 0.005 0.766 9.09 3.79 2.35 1.63 0.925 1.32 0.731 2.06
1989 0.502 1.32 0.735 0 0 13.5 10.5 2.04 1.84 1.06 1.22 1.84 2.89
1990 2.05 3.18 1.34 1.13 1.08 2.25 2.90 2.83 5.06 6.29 0.924 1.48 2.55
1991 0.432 0.633 1.03 1.05 1.61 3.33 2.13 2.65 1.12 1.03 1.08 2.46 1.54
1992 2.91 3.11 0.412 0.478 3.75 11.5 3.05 2.15 1.40 1.51 0.763 1.68 2.72
1993 1.52 2.36 1.40 0.127 0.452 27.2 7.69 4.84 12.7 58.9 22.5 4.68 12.2
1994 3.16 3.05 1.05 0.315 0.142 54.8 34.2 9.24 10.9 4.19 1.84 2.57 10.5
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U.S. Geological Survey Maintainer: Webmaster Last update: Tuesday, 31-Aug-2004 10:28:35 EDT Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr97416/htdocs/f.05054500.html |
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