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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 138 1945 2.16 1957 29.2 28.9 0.99 4.61
November 105 1945 4.94 1958 25.2 22.6 0.90 3.98
December 77.6 1945 4.37 1938 26.3 20.0 0.76 4.15
January 57.0 1966 3.23 1938 24.4 17.4 0.71 3.85
February 60.1 1969 0.793 1940 24.5 15.7 0.64 3.87
March 83.2 1969 0.371 1940 33.9 19.6 0.58 5.36
April 190 1966 1.15 1938 77.8 48.3 0.62 12.3
May 265 1966 1.45 1940 115 65.6 0.57 18.2
June 284 1943 2.16 1940 114 71.1 0.62 18.0
July 206 1944 1.52 1940 77.1 51.8 0.67 12.2
August 288 1944 0.510 1940 49.8 57.5 1.15 7.87
September 238 1944 1.40 1970 35.6 42.8 1.20 5.63
Annual 98.4 1966 9.82 1940 53.7 23.6 0.44 100
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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 3.50 2.50 2.70 1.30 6.52 16.9 6.28 1.20 1.50 1.70 5.10 6.10 2.50
90 5.70 3.80 10.9 6.10 22.7 26.7 15.2 3.70 1.80 2.80 5.90 7.60 6.17
85 7.30 7.58 13.4 25.2 34.0 37.5 20.2 6.63 3.50 4.50 6.70 8.50 9.22
80 8.75 10.4 15.6 31.9 46.6 46.5 24.1 9.96 5.90 7.07 8.91 8.50 12.3
75 9.56 11.9 18.2 37.6 59.8 56.9 28.0 13.5 9.60 8.80 10.5 10.6 15.2
70 10.2 13.5 20.9 44.1 74.8 67.5 36.4 15.7 12.8 11.7 12.3 12.1 17.9
65 12.3 15.0 23.8 49.2 86.9 77.4 46.1 17.8 15.5 14.2 13.7 14.5 21.1
60 14.1 16.8 26.0 54.2 100 86.8 55.9 20.6 18.1 16.2 15.1 15.9 24.7
55 17.2 19.2 28.1 59.2 109 94.5 64.8 24.2 20.7 17.7 16.5 18.3 28.7
50 19.4 21.8 30.3 64.4 117 102 72.9 28.5 24.2 19.3 17.8 19.9 33.3
45 22.8 25.7 33.2 74.3 126 109 80.0 33.8 27.7 22.3 19.0 21.5 38.3
40 26.6 28.8 36.1 84.0 133 121 87.1 40.0 30.9 25.1 21.5 23.4 45.0
35 30.3 31.6 39.1 93.6 141 133 93.9 47.8 35.0 28.6 23.8 25.4 52.7
30 34.2 34.0 42.1 104 150 145 101 58.1 39.5 33.1 26.2 29.1 61.2
25 37.9 36.4 45.1 113 162 156 108 69.2 46.4 38.7 29.6 33.6 73.8
20 43.4 39.7 49.4 127 174 173 118 80.7 55.5 47.3 35.6 40.4 89.9
15 49.3 43.4 54.2 142 188 194 128 97.1 66.6 60.6 47.8 53.0 110
10 53.8 48.5 63.6 163 204 225 149 121 77.6 67.8 57.8 61.1 136
5 58.1 54.8 82.9 187 227 268 192 167 97.4 90.0 76.6 68.9 177
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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 37.6 37.4 32.7 25.9 22.1
0.95 1.05 62.7 61.6 56.4 48.7 43.5
0.90 1.11 80.4 78.5 73.4 65.7 59.9
0.80 1.25 106 103 98.6 91.4 84.8
0.50 2 171 164 161 155 147
0.20 5 255 242 239 234 223
0.10 10 306 288 284 278 264
0.04 25 363 341 334 324 306
0.02 50 401 375 366 352 331
0.01 100 436 407 394 376 352
0.005 200 467 436 420 397 369
0.002 500 506 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 0.222 0.275 0.317 0.432 0.691 1.15 2.32 3.11 5.96
0.10 10 0.430 0.506 0.583 0.799 1.20 2.00 3.45 4.51 7.56
0.20 5 0.909 1.02 1.17 1.60 2.24 3.66 5.46 6.92 10.1
0.50 2 3.24 3.40 3.86 5.13 6.45 9.84 12.3 14.7 18.1
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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 1.49 1.79 1.98 2.46 0.623 1.01 1.45 2.63
0.10 10 2.48 2.88 3.17 3.91 1.63 2.37 3.30 5.94
0.20 5 4.35 4.88 5.35 6.53 4.38 5.67 7.56 13.0
0.50 2 11.0 11.7 12.7 15.1 17.4 19.4 23.2 33.7
June-July-August September-October-December
_________________________ __________________________
0.05 20 0.435 0.749 1.27 2.65 0.538 0.680 1.06 1.78
0.10 10 0.991 1.57 2.45 4.93 0.998 1.23 1.73 2.66
0.20 5 2.47 3.57 5.11 9.66 2.02 2.43 3.06 4.30
0.50 2 11.1 41.7 17.4 27.9 6.82 7.88 8.65 1.07
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Annual peak discharge and corresponding gage height, period of record _____________________________________________________________________________________
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
1937 June 20 3.53 54.0 1955 August 3 4.28 195
1938 June 3 3.67 73.0 1956 May 3 4.07 139
1939 March 23 4.83 239 1957 May 14 4.00 133
1940 September 21 3.45 42.0 1958 October 16 3.66 72.0
1941 May 15 3.66 68.0 1959 June 11 3.99 136
1942 June 16 3.88 112 1960 May 3 4.34 214
1943 June 26 4.78 371 1961 May 15 4.12 151
1944 August 22 4.68 336 1962 June 8 4.65 316
1945 May 13 4.29 198 1963 June 9 4.07 157
1946 July 21 4.26 190 1964 May 19 4.10 164
1947 May 2 4.35 212 1965 June 13 4.45 264
1948 April 30 3.93 119 1966 May 3 4.51 283
1949 July 31 4.00 133 1967 June 22 4.27 267
1950 May 29 4.71 332 1968 May 29 4.18 188
1951 June 2 4.26 190 1969 April 21 4.30 207
1952 April 21 4.16 167 1970 June 16 4.21 182
1953 June 15 4.36 218 1971 April 10 3.76 84.0
1954 May 5 4.27 193
Annual peak discharge, from highest to lowest, and corresponding gage height
1943 June 26 4.78 371 1970 June 16 4.21 182
1944 August 22 4.68 336 1952 April 21 4.16 167
1950 May 29 4.71 332 1964 May 19 4.10 164
1962 June 8 4.65 316 1963 June 9 4.07 157
1966 May 3 4.51 283 1961 May 15 4.12 151
1967 June 22 4.27 267 1956 May 3 4.07 139
1965 June 13 4.45 264 1959 June 11 3.99 136
1939 March 23 4.83 239 1949 July 31 4.00 133
1953 June 15 4.36 218 1957 May 14 4.00 133
1960 May 3 4.34 214 1948 April 30 3.93 119
1947 May 2 4.35 212 1942 June 16 3.88 112
1969 April 21 4.30 207 1971 April 10 3.76 84.0
1945 May 13 4.29 198 1938 June 3 3.67 73.0
1955 August 3 4.28 195 1958 October 16 3.66 72.0
1954 May 5 4.27 193 1941 May 15 3.66 68.0
1946 July 21 4.26 190 1937 June 20 3.53 54.0
1951 June 2 4.26 190 1940 September 21 3.45 42.0
1968 May 29 4.18 188
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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
__________________________________________________________________________________________________________________________________
1937 -- -- -- -- -- -- 1.26 22.3 45.3 17.9 6.10 31.8 --
1938 21.3 7.25 4.37 3.23 3.50 2.64 1.15 21.0 28.0 11.9 17.5 19.9 11.9
1939 14.4 10.3 9.97 9.16 10.2 26.7 70.2 16.5 21.5 16.2 15.8 18.6 19.9
1940 33.5 28.5 18.4 7.61 0.793 0.371 5.16 1.45 2.16 1.52 0.510 17.7 9.82
1941 18.3 17.3 18.5 18.5 19.2 24.5 19.6 30.0 25.8 21.0 5.32 3.09 18.4
1942 2.70 30.8 29.1 11.5 5.70 41.2 29.1 74.0 86.5 37.1 18.4 78.3 37.1
1943 93.0 72.8 73.3 21.5 32.1 50.4 87.5 151.5 284.3 202.8 77.3 27.5 98.1
1944 11.8 16.2 12.5 8.58 17.6 15.2 44.1 104.4 190.8 205.7 287.8 238.5 96.2
1945 138.5 105.1 77.6 52.8 32.4 67.5 176.0 190.0 134.3 23.9 27.2 54.0 90.1
1946 70.1 56.7 38.1 36.3 38.9 62.7 138.9 123.3 91.5 160.4 72.6 11.8 75.4
1947 57.4 69.2 51.4 49.0 41.7 43.3 127.0 175.0 169.9 104.4 27.5 13.8 77.6
1948 4.06 7.35 17.0 19.2 21.3 30.9 88.6 100.3 76.6 72.9 56.5 19.3 42.9
1949 9.43 11.0 8.57 7.85 8.30 16.1 74.5 84.5 65.5 93.0 116.0 38.1 44.7
1950 21.5 15.4 9.06 4.48 28.6 36.3 87.9 257.6 246.4 97.9 27.5 2.75 69.8
1951 5.40 6.37 7.65 5.65 20.5 55.1 74.6 148.7 141.6 65.0 16.4 17.0 47.1
1952 35.9 38.7 53.1 56.6 54.1 53.7 106.3 113.0 33.8 76.8 93.9 35.4 62.8
1953 14.6 8.67 9.01 7.09 7.79 33.2 86.7 124.6 188.6 115.4 146.5 81.9 68.9
1954 40.9 21.3 24.4 33.1 37.0 47.1 109.5 174.6 120.4 51.6 10.4 5.10 56.4
1955 13.6 13.5 14.1 10.2 17.0 24.7 53.8 79.6 69.0 83.5 161.3 84.8 52.3
1956 44.4 13.8 9.40 8.97 11.8 16.8 91.3 122.4 81.4 25.2 10.6 3.89 36.7
1957 2.16 6.97 7.91 10.0 10.6 18.0 65.3 121.6 103.0 102.0 57.8 47.8 46.3
1958 56.8 4.94 40.1 55.5 46.0 42.3 31.3 27.5 50.7 50.5 27.7 31.1 38.8
1959 16.4 27.7 63.7 48.3 27.4 18.3 44.0 52.9 99.9 106.0 83.2 56.9 53.9
1960 29.5 24.3 25.9 37.4 17.5 14.0 97.0 160.4 134.5 95.0 27.3 65.6 60.7
1961 32.0 21.7 24.1 38.5 41.4 24.4 40.5 115.9 89.9 34.0 11.1 11.4 40.4
1962 6.58 6.95 8.28 11.8 15.8 24.6 52.0 137.5 246.9 134.5 55.9 22.6 60.4
1963 16.5 17.5 19.8 16.5 12.1 20.5 41.6 52.7 116.0 58.5 31.8 33.8 36.5
1964 18.9 7.84 10.9 14.6 14.4 18.1 83.1 141.6 100.3 78.6 22.9 22.4 44.5
1965 23.1 22.8 25.8 25.4 26.1 31.7 136.7 187.9 224.7 116.9 51.0 28.7 75.2
1966 59.1 56.1 60.1 57.0 52.8 73.3 190.5 265.1 144.4 66.3 81.9 71.7 98.4
1967 38.9 36.7 36.0 31.6 31.9 46.3 156.3 184.3 193.9 148.8 34.4 2.64 78.6
1968 3.79 13.8 17.5 12.4 3.29 16.1 44.3 150.0 142.3 80.7 36.2 9.91 44.3
1969 18.3 25.0 29.2 44.5 60.1 83.2 148.8 143.1 51.9 17.2 4.61 3.06 52.3
1970 16.8 19.0 18.2 28.8 33.7 34.6 64.4 132.5 141.4 94.1 9.16 1.40 49.6
1971 2.86 13.6 20.0 25.4 31.9 39.6 53.9 40.4 38.5 32.2 13.4 34.8 28.8
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U.S. Geological Survey Maintainer: Webmaster Last update: Tuesday, 31-Aug-2004 10:28:13 EDT Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr97416/htdocs/f.05030000.html |
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