Maintainer: Webmaster
Last update: Wednesday, 23-Feb-2005 09:45:50 EST
Privacy || Disclaimer|| Accessibility || FOIA
URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05077500.html
----------------------------------------------------------------------------------------------------------
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 87.4 1947 20.3 1941 48.2 27.3 0.57 6.57
November 82.7 1945 25.5 1935 44.8 18.1 0.40 6.11
December 63.6 1945 24.4 1935 37.6 11.4 0.30 5.13
January 47.9 1946 19.9 1940 33.1 7.66 0.23 4.51
February 48.9 1945 16.9 1937 30.7 8.71 0.28 4.19
March 178 1945 12.4 1937 55.1 50.7 0.92 7.52
April 363 1947 57.1 1938 142 81.7 0.58 19.4
May 236 1947 53.5 1935 119 54.4 0.46 16.2
June 219 1943 25.7 1936 85.9 54.5 0.63 11.7
July 81.5 1944 15.1 1936 43.4 19.2 0.44 5.91
August 114 1944 6.09 1936 41.5 28.9 0.70 5.66
September 118 1944 9.53 1934 52.3 34.5 0.66 7.13
Annual 102 1947 36.9 1936 61.8 22.5 0.36 100
__________________________________________________________________________________________________________
----------------------------------------------------------------------------------------------------------------------
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 19.0 15.1 12.7 39.9 44.4 25.8 14.6 5.20 8.30 17.2 24.3 25.2 17.4
90 26.3 18.5 16.4 50.3 54.2 31.7 19.6 8.64 16.2 18.7 27.2 25.8 22.4
85 27.3 22.0 23.8 59.5 62.4 35.7 24.3 13.2 17.4 20.0 29.3 26.8 25.3
80 27.9 25.7 25.3 67.6 66.3 39.3 26.0 17.3 18.5 22.1 30.6 28.6 27.7
75 29.1 27.5 26.7 73.9 70.8 43.1 27.2 19.8 20.3 25.3 31.8 30.2 29.5
70 29.7 28.3 28.2 80.2 79.9 46.3 28.7 23.3 23.5 26.2 32.6 30.9 31.4
65 30.3 28.7 29.8 86.5 84.9 50.7 30.9 25.2 27.2 27.9 33.2 31.4 33.4
60 31.1 29.3 31.5 92.7 90.1 55.8 33.0 27.6 36.4 32.4 33.9 32.0 35.9
55 31.5 30.0 33.2 100 96.1 59.7 34.8 31.2 40.5 34.6 35.8 32.9 38.5
50 31.8 30.8 35.0 108 102 65.4 37.6 36.5 43.9 38.6 40.1 34.0 41.9
45 32.4 31.4 36.8 119 108 74.9 42.5 38.8 46.6 45.7 43.5 37.1 45.6
40 33.1 31.9 38.4 129 115 82.1 44.8 41.2 49.3 51.4 45.9 39.4 50.3
35 33.8 33.3 40.1 143 122 87.7 47.5 44.4 54.7 58.3 49.6 41.3 55.2
30 35.6 35.1 41.7 159 132 97.8 50.8 49.2 64.8 63.0 54.2 42.7 63.0
25 38.0 36.6 43.9 188 142 114 55.8 55.4 71.9 71.5 57.2 43.8 72.6
20 39.6 37.7 48.4 203 153 125 62.0 60.5 84.7 78.3 60.4 45.7 84.3
15 43.6 39.2 59.5 218 169 136 68.4 64.5 98.3 84.8 66.0 48.5 99.6
10 47.9 43.6 86.0 264 206 162 80.3 74.7 115 91.6 73.0 54.3 123
5 48.7 31.5 235 378 272 226 93.6 120 125 102 83.7 61.8 174
_____________________________________________________________________________________________________________________
--------------------------------------------------------------------------------------------------
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) (ft/s)
__________________________________________________________________________________________________
0.99 1.01 67.7 65.1 63.8 58.3 63.3
0.95 1.05 104 99.9 95.8 85.1 81.5
0.90 1.11 130 124 118 104 94.2
0.80 1.25 168 161 152 132 113
0.50 2 266 256 240 205 165
0.20 5 408 395 371 317 251
0.10 10 503 490 462 396 318
0.04 25 622 610 581 500 413
0.02 50 709 699 670 580 493
0.01 100 795 788 761 662 580
0.005 200 880 877 852 747 676
0.002 500 992 ng ng ng ng
__________________________________________________________________________________________________
------------------------------------------------------------------------------------
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 1.66 1.86 4.12 5.98 7.59 11.3 14.8 16.6 19.0
0.10 10 3.03 3.32 6.37 8.83 10.9 14.4 17.4 19.0 21.7
0.20 5 5.80 6.20 10.2 13.3 15.8 18.8 21.0 22.5 25.7
0.50 2 16.2 16.7 20.8 24.1 26.9 28.5 29.2 30.8 35.7
____________________________________________________________________________________
-------------------------------------------------------------------------------------
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 10.0 12.1 13.8 17.4 3.76 4.25 9.97 14.3
0.10 10 13.0 14.8 16.4 19.8 6.85 7.90 13.4 17.4
0.20 5 17.1 18.6 19.8 22.8 12.5 14.4 18.4 22.3
0.50 2 26.2 26.7 27.4 29.5 27.6 30.4 133.5 37.2
June-July-August September-October-November
_________________________ ___________________________
0.05 20 4.96 5.70 6.29 8.07 6.90 8.65 9.04 10.5
0.10 10 7.67 8.56 9.47 11.8 9.40 11.5 12.0 13.6
0.20 5 12.2 13.2 14.6 17.6 13.4 15.9 16.6 18.4
0.50 2 24.7 25.9 28.2 32.6 25.3 28.1 29.4 31.8
______________________________________________________________________________________
1Graphical interpretation.
-------------------------------------------------------------------------------------
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)
_____________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
1935 May 15 1.49 100 1942 April 1 2.04 198
1936 April 19 2.06 275 1943 April 8 2.57 382
1937 September 3 1.96 236 1944 June 9 1.84 174
1938 May 11 2.43 347 1945 March 27 2.70 435
1939 April 5 1.56 115 1946 March 25 2.77 399
1940 April 16 2.22 266 1947 April 21 3.19 655
1941 April 15 2.06 237
Annual peak discharge, from highest to lowest, and corresponding gage height
1947 April 21 3.19 655 1941 April 15 2.06 237
1945 March 27 2.70 435 1937 September 3 1.96 236
1946 March 25 2.77 399 1942 April 1 2.04 198
1943 April 8 2.57 382 1944 June 9 1.84 174
1938 May 11 2.43 347 1939 April 5 1.56 115
1936 April 19 2.06 275 1935 May 15 1.49 100
1940 April 16 2.22 266
_____________________________________________________________________________________
---------------------------------------------------------------------------------------------------------------------------------
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
____________________________________________________________________________________________________________________
1934 -- -- -- -- -- -- -- -- -- 23.1 8.46 9.53 --
1935 29.6 25.5 24.4 30.9 22.6 32.4 75.9 69.5 48.6 37.0 36.9 33.2 38.9
1936 24.4 32.6 31.1 31.9 27.5 29.9 116.1 80.4 25.7 15.1 6.09 22.5 36.9
1937 26.5 29.9 25.8 27.5 16.9 12.4 95.3 98.5 55.0 59.7 77.0 82.9 50.7
1938 33.3 33.1 27.8 29.6 30.1 53.6 57.1 204.5 60.0 31.9 26.7 17.5 50.7
1939 22.3 32.9 34.1 31.9 31.1 34.7 93.2 53.5 47.0 30.0 19.9 17.6 37.3
1940 25.8 26.1 29.7 19.9 19.9 22.0 128.9 117.9 42.6 26.0 19.4 20.3 41.5
1941 20.3 37.0 32.1 31.8 28.5 28.4 145.6 58.3 107.7 31.8 29.1 92.4 53.3
1942 81.8 51.3 43.0 29.7 29.7 64.4 107.3 110.8 50.9 36.0 46.0 86.7 61.6
1943 58.3 51.3 38.9 34.4 36.5 38.4 216.1 163.3 219.4 53.2 45.2 47.6 83.4
1944 47.5 47.5 41.7 29.0 29.9 29.1 84.4 124.1 132.6 81.5 114.4 118.3 73.3
1945 81.9 82.7 63.6 47.0 48.9 178.2 206.6 124.7 94.8 58.5 62.6 81.3 94.4
1946 87.0 63.3 53.8 47.9 41.9 151.3 157.3 103.9 84.6 63.3 37.9 48.5 78.6
1947 87.4 69.6 43.0 38.9 36.1 42.0 362.6 235.5 147.4 60.3 51.7 53.7 102.3
____________________________________________________________________________________________________________________
|
U.S. Department of the Interior ||
U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:45:50 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05077500.html |
|