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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 19.6 1942 0 m 2.20 5.79 2.63 0.64
November 3.74 1942 0 m 0.870 1.43 1.65 0.25
December 2.78 1945 0 m 0.490 0.86 1.76 0.14
January 0.274 1945 0 m 0.090 0.09 1.06 0.03
February 0.200 m 0 m 0.070 0.08 1.08 0.02
March 181 1945 0 m 41.7 59.7 1.43 12.1
April 642 1950 17.7 m 208 228 1.10 60.3
May 639 1950 2.28 1940 68.3 190 2.78 19.8
June 56.2 1943 0.180 1940 11.2 15.9 1.42 3.24
July 23.9 1947 0.019 1940 6.07 8.99 1.48 1.76
August 21.7 1948 0.042 m 3.13 6.38 2.04 0.91
September 17.4 1941 0.023 1940 2.76 5.23 1.89 0.80
Annual 109 1950 1.67 1940 28.7 30.5 1.07 100
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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 0.19 1.80 0 0 0 0 0 0 0 0
90 0 0 0 1.40 2.30 0.39 0 0 0.10 0 0 0 0
85 0 0 0 3.90 2.30 0.62 0.10 0.10 0.10 0 0 0 0
80 0 0 0 5.60 2.30 0.98 0.10 0.10 0.10 0.10 0.10 0 0.10
75 0 0 0 8.37 3.00 1.50 0.20 0.10 0.10 0.19 0.10 0.10 0.10
70 0 0 0 11.8 3.00 1.90 0.20 0.10 0.10 0.19 0.10 0.10 0.10
65 0 0 0.10 15.1 4.56 2.40 0.25 0.18 0.18 0.19 0.19 0.10 0.19
60 0 0 0.10 17.8 5.16 2.40 0.25 0.18 0.18 0.19 0.19 0.10 0.19
55 0.10 0 0.10 22.6 5.67 3.10 0.49 0.18 0.18 0.19 0.19 0.10 0.19
50 0.10 0.10 0.10 28.0 6.70 4.51 0.61 0.28 0.18 0.19 0.19 0.10 0.19
45 0.10 0.10 0.10 34.8 8.22 6.02 0.96 0.34 0.18 0.28 0.19 0.10 0.37
40 0.10 0.10 0.17 45.2 9.25 6.81 1.50 0.42 0.18 0.28 0.19 0.20 0.71
35 0.10 0.10 0.17 63.2 10.8 8.10 1.90 0.51 0.33 0.35 0.19 0.20 1.40
30 0.10 0.10 0.63 99.1 13.0 9.79 2.40 0.77 0.50 0.43 0.36 0.20 1.90
25 0.10 0.10 3.00 141 15.3 11.0 4.18 1.40 0.74 0.66 0.89 0.27 4.05
20 0.20 0.10 10.0 180 22.0 13.9 5.47 2.20 1.30 1.00 1.00 0.48 5.87
15 0.20 0.10 89.0 274 31.9 17.0 6.79 4.00 2.50 1.50 1.50 0.84 11.0
10 0.20 0.10 164 562 62.9 24.0 14.4 9.72 5.67 2.80 3.70 1.60 22.0
5 0.20 0.10 301 1,140 235 50.0 23.0 13.8 11.5 8.38 4.80 2.90 83.8
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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 40.6 48.5 29.1 14.7 7.85
0.95 1.05 110 98.1 65.5 40.0 21.7
0.90 1.11 186 144 101 65.7 36.3
0.80 1.25 346 233 168 116 65.6
0.50 2 1,100 600 446 311 187
0.20 5 3,380 1,620 1,160 737 482
0.10 10 5,980 2,760 1,910 1,100 758
0.04 25 10,800 4,950 3,240 1,640 1,190
0.02 50 15,900 7,280 4,530 2,080 1,570
0.01 100 22,200 10,300 6,130 2,550 2,000
0.005 200 30,100 14,300 8,070 3,030 2,460
0.002 500 43,400 ng ng ng ng
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Probability of occurrence of annual low discharges
[ng, statistic not given]
____________________________________________________________________________________
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)
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0.05 20 ng ng 0 0 0 0 0 0 0
0.10 10 ng ng 0 0 0 0 0 0 0
0.20 5 ng ng 0 0 0 0 0 0.032 0.093
0.50 2 ng ng 0 0.034 0.054 0.087 0.109 0.125 0.234
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Probability of occurrence of seasonal low discharges
[ng, statistic not given]
___________________________________________________________________________________________
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 ng 0 0 0 0 0 0 0
0.10 10 ng 0 0 0 0 0 0 0
0.20 5 ng 0 0 0 0 0 0 0
0.50 2 ng 0.084 10.087 10.090 0.088 10.425 10.760 1.10
June-July-August September-October-November
__________________________ ____________________________
0.05 20 0 0 0 0 0 0 0 0
0.10 10 0 0 0.004 0.025 0 0 0 0
0.20 5 0 0 0.023 0.071 0 0.050 0.087 0.114
0.50 2 0.103 0.115 0.147 0.292 0.102 0.117 0.121 0.207
___________________________________________________________________________________________
1Graphical interpretation.
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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
1940 April 19 3.16 171 1946 March 22 5.66 400
1941 April 10 8.85 3,340 1947 July 25 4.30 518
1942 April 4 -- 1,880 1948 April 18 11.80 11,000
1943 March 24 7.60 900 1949 April 9 5.93 1,200
1944 April 11 -- 170 1950 April 19 10.10 5,970
1945 March 14 6.60 800
Annual peak discharge, from highest to lowest, and corresponding gage height
1948 April 18 11.80 11,000 1945 March 14 6.60 800
1950 April 19 10.10 5,970 1947 July 25 4.30 518
1941 April 10 8.85 3,340 1946 March 22 5.66 400
1942 April 4 -- 1,880 1940 April 19 3.16 171
1949 April 9 5.93 1,200 1944 April 11 -- 170
1943 March 24 7.60 900
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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
__________________________________________________________________________________________________________________________________
1940 0 0 0 0 0 0 17.7 2.28 0.180 0.019 0.042 0.023 1.67
1941 0 0 0 0 0 0 332.1 5.77 4.01 0.594 0.787 17.4 29.7
1942 19.6 3.74 1.40 0 0 58.9 246.0 16.0 5.60 0.794 1.69 1.70 29.5
1943 0.213 0.180 0.200 0.200 0.200 96.1 63.8 7.98 56.2 14.7 0.342 0.190 20.1
1944 0.261 0.277 0.071 0 0 0 34.0 2.51 1.82 0.245 5.74 6.39 4.23
1945 0.358 3.70 2.78 0.274 0.200 181.0 23.4 11.1 6.75 2.41 0.235 0.163 19.6
1946 0.181 0.150 0.100 0.100 0.100 92.1 17.7 3.65 2.73 0.113 0.100 0.530 9.92
1947 0.374 0.170 0.100 0.032 0 29.4 80.0 3.94 15.8 23.9 2.50 3.16 13.3
1948 1.55 0.947 0.461 0.148 0.100 0.303 578.5 45.8 11.6 20.2 21.7 0.260 56.1
1949 0.381 0.207 0.139 0.100 0.100 0.113 251.1 13.0 2.26 0.368 0.042 0.147 22.1
1950 1.28 0.190 0.113 0.100 0.100 1.04 641.8 639.2 16.0 3.44 1.24 0.397 109.0
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U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:46:01 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05088000.html |
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