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Last update: Wednesday, 23-Feb-2005 09:45:56 EST
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Statistics of monthly and annual mean discharges
[m, more than 1 year of occurrence]
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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
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October 49.1 1966 0.626 1961 8.86 11.4 1.29 1.44
November 24.9 1958 0.643 1964 7.75 5.21 0.67 1.26
December 10.2 1966 0.097 1964 3.66 2.76 0.75 0.59
January 5.10 1951 0 m 1.45 1.62 1.12 0.24
February 4.84 1967 0 m 0.940 1.27 1.34 0.15
March 479 1966 0 m 46.9 97.6 2.08 7.61
April 1990 1950 23.2 1958 348 437 1.26 56.4
May 1460 1950 7.87 1946 105 286 2.72 17.1
June 269 1964 3.43 1961 52.8 59.6 1.13 8.56
July 57.9 1968 1.15 1961 19.7 16.5 0.83 3.20
August 22.1 1966 0.287 1946 5.91 5.10 0.86 0.96
September 215 1957 0.180 1959 15.8 42.9 2.72 2.55
Annual 299 1950 7.51 1961 51.2 58.8 1.15 100
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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 0.42 7.62 3.20 0.67 0.10 0 0.10 0.82 0.10 0
90 0 0 0 7.20 9.94 5.34 1.40 0.26 0.17 0.36 1.80 0.29 0.10
85 0 0 0 17.8 12.0 6.68 2.80 0.69 0.17 0.70 2.40 0.45 0.23
80 0.10 0 0 22.3 13.9 9.23 3.82 1.00 0.40 1.10 3.30 0.70 0.52
75 0.10 0.10 0.08 26.0 15.3 12.0 4.84 1.20 0.40 1.60 3.90 0.95 0.78
70 0.10 0.10 0.08 29.8 16.7 13.6 5.94 1.50 0.52 2.00 3.90 1.50 1.20
65 0.19 0.10 0.08 35.4 18.2 15.2 7.33 1.80 0.69 2.00 4.60 2.00 1.80
60 0.29 0.10 0.08 41.9 19.7 17.2 8.88 2.20 0.90 2.50 5.32 2.30 2.82
55 0.55 0.28 0.44 50.1 21.2 19.9 10.0 2.70 1.20 3.90 6.03 2.30 3.59
50 0.72 0.47 0.87 60.0 23.2 23.0 11.1 2.70 1.60 4.81 6.55 2.70 5.11
45 0.93 0.56 1.20 76.9 25.6 26.3 13.2 3.20 2.10 5.60 6.96 3.10 6.57
40 1.40 0.56 1.70 102 29.7 30.1 14.6 3.90 2.70 6.48 7.38 3.10 8.46
35 1.60 0.80 1.70 136 36.5 34.5 16.3 5.28 4.34 7.64 7.91 3.60 11.1
30 2.00 0.95 1.70 190 44.4 41.3 18.2 6.24 5.61 8.47 8.77 4.20 14.0
25 2.30 1.30 3.94 309 54.6 49.2 21.5 7.44 8.78 10.2 9.39 4.90 18.3
20 2.30 1.60 12.3 448 74.9 64.8 26.5 8.97 12.9 12.7 11.2 5.70 24.9
15 3.00 1.90 40.4 659 102 87.6 32.8 11.6 17.5 15.1 13.4 7.49 35.3
10 3.90 1.90 73.4 931 156 137 43.2 14.5 26.1 20.5 15.7 8.55 60.4
5 5.10 2.20 265 1,370 318 216 71.8 21.4 50.9 32.6 20.7 10.3 153
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Probability of occurrence of annual high discharges
[ng, statistic not given]
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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 36.9 45.2 34.5 26.9 24.5
0.95 1.05 87.8 100 82.8 62.6 47.2
0.90 1.11 140 154 131 96.9 67.7
0.80 1.25 249 262 225 163 106
0.50 2 757 739 620 423 255
0.20 5 2,360 2,150 1,650 1,050 638
0.10 10 4,320 3,820 2,710 1,660 1,050
0.04 25 8,270 7,090 4,550 2,680 1,800
0.02 50 12,600 10,600 6,330 3,610 2,570
0.01 100 18,600 15,400 8,480 4,710 3,560
0.005 200 26,500 21,600 11,100 5,980 4,810
0.002 500 40,700 ng ng ng ng
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Probability of occurrence of annual low discharges
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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 0.144 0.701
0.10 10 0 0 0 0 0 0 0.013 0.288 1.00
0.20 5 0 0 0 0 0 0.024 0.112 0.598 1.52
0.50 2 0 0 0.035 0.086 0.152 0.425 0.730 1.77 3.23
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Probability of occurrence of seasonal low discharges
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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 0.009
0.20 5 0 0 0 0 0 0 0 0.186
0.50 2 0.203 0.223 0.267 0.339 0.321 10.375 0.423 3.53
June-July-August September-October-November
____________________________ ______________________________
0.05 20 0 0.037 0.137 0.464 0 0 0.006 0.039
0.10 10 0.047 0.138 0.255 0.759 0 0 0.039 0.145
0.20 5 0.184 0.332 0.515 1.33 0 0.082 0.129 0.361
0.50 2 0.788 1.20 1.68 3.45 0.334 0.590 0.838 1.61
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1Graphical interpretation.
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Annual peak discharge and corresponding gage height
_____________________________________________________________________________________
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
1946 March 23 14.38 700 1961 March 24 9.53 110
1947 April 13 8.79 431 1962 April 14 16.22 970
1948 April 19 17.88 7,130 1963 April 6 7.97 150
1949 April 10 15.83 1,600 1964 June 23 11.40 661
1950 April 19 21.50 28,000 1965 April 13 16.92 3,150
1951 April 6 13.90 940 1966 March 22 17.95 1,680
1952 April 7 13.90 600 1967 March 31 16.64 2,000
1953 June 22 7.48 219 1968 March 29 12.45 450
1954 April 11 8.45 100 1969 April 13 17.38 3,470
1955 April 5 16.27 1,460 1970 April 11 17.37 2,430
1956 April 20 16.20 1,500 1972 March 19 16.75 2,000
1957 September 5 13.15 900 1973 March 12 8.69 150
1958 October 9 6.04 135 1980 April 3 13.08 500
1959 March 30 13.31 370 1981 June 17 6.39 84.0
1960 April 7 13.90 1,080 1982 April 2 15.74 578
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 19 21.50 28,000 1946 March 23 14.38 700
1948 April 19 17.88 7,130 1964 June 23 11.40 661
1969 April 13 17.38 3,470 1952 April 7 13.90 600
1965 April 13 16.92 3,150 1982 April 2 15.74 578
1970 April 11 17.37 2,430 1980 April 3 13.08 500
1967 March 31 16.64 2,000 1968 March 29 12.45 450
1972 March 19 16.75 2,000 1947 April 13 8.79 431
1966 March 22 17.95 1,680 1959 March 30 13.31 370
1949 April 10 15.83 1,600 1953 June 22 7.48 219
1956 April 20 16.20 1,500 1963 April 6 7.97 150
1955 April 5 16.27 1,460 1973 March 12 8.69 150
1960 April 7 13.90 1,080 1958 October 9 6.04 135
1962 April 14 16.22 970 1961 March 24 9.53 110
1957 September 5 13.15 900 1954 April 11 8.45 100
1951 April 6 13.90 940 1981 June 17 6.39 84.0
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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]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1946 2.07 1.81 0.368 0.100 0.100 140.5 35.4 7.87 5.08 48.0 0.287 5.72 20.9
1947 11.4 4.38 1.90 0.187 0.100 73.3 193.1 20.6 58.8 8.29 8.59 1.52 31.8
1948 6.40 7.05 2.50 0.116 0.100 0.100 1,164 68.4 88.2 21.1 10.0 2.19 112.6
1949 1.30 4.62 0.468 0.129 0.100 0.100 384.6 28.7 34.0 8.40 3.05 0.413 38.4
1950 6.66 6.73 6.87 0.100 0 0 1,987 1,456 48.9 42.3 8.92 19.6 298.7
1951 16.7 13.7 4.52 5.10 2.00 41.2 211.0 24.1 14.1 3.95 12.0 41.5 32.3
1952 7.47 8.20 5.52 0.742 0.100 1.79 167.1 14.8 7.00 41.0 3.70 0.697 21.4
1953 0.819 9.24 3.73 1.15 0.796 18.1 27.2 26.3 89.7 42.5 4.07 1.04 18.7
1954 2.61 3.11 2.35 0.284 1.22 26.6 45.3 16.5 20.4 11.3 2.06 1.56 11.1
1955 3.17 6.55 2.73 1.08 0.671 0.048 225.0 18.9 110.1 10.5 3.63 0.693 31.6
1956 3.63 3.73 0.658 0.348 0.472 0.668 323.1 62.6 42.8 7.00 2.16 4.50 37.2
1957 0.958 8.40 3.62 2.89 0.639 45.2 40.6 16.2 13.9 1.64 7.06 215.3 29.5
1958 37.4 24.9 7.39 2.26 4.21 12.2 23.2 14.2 13.9 19.6 1.09 0.307 13.4
1959 1.45 5.11 1.28 0.019 0 38.4 59.5 16.5 11.2 7.82 2.89 0.180 12.0
1960 9.67 5.81 3.30 2.43 1.83 37.3 429.5 24.4 17.7 7.10 2.02 1.22 44.7
1961 0.626 4.00 0.613 0.794 0.550 36.0 25.9 14.6 3.43 1.15 0.661 1.17 7.51
1962 5.92 3.19 1.29 0 0 0 359.3 133.1 169.8 20.6 3.47 4.68 58.1
1963 4.47 10.6 3.51 0.484 0 21.5 46.0 13.9 12.5 10.1 3.24 0.653 10.6
1964 1.11 0.643 0.097 0 0 0.074 148.3 20.1 269.1 20.8 7.61 14.1 39.6
1965 12.4 7.35 3.38 1.19 1.48 2.09 557.7 85.9 72.8 19.4 6.49 32.7 66.3
1966 49.1 16.7 10.2 4.84 1.66 479.2 395.1 148.1 34.7 45.5 22.1 8.06 102.0
1967 8.90 8.25 5.65 4.03 4.84 96.4 535.3 191.0 32.1 6.61 2.25 0.826 74.5
1968 4.46 6.09 3.71 1.95 1.73 100.8 50.2 20.2 54.1 57.9 13.2 13.5 27.4
1969 8.82 12.5 8.15 1.78 0.179 0.081 631.7 31.6 37.9 16.0 4.27 10.9 63.0
1970 14.0 11.1 7.76 4.24 0.837 1.91 622.5 157.6 56.8 15.0 12.9 10.8 75.8
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U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:45:56 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05083000.html |
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