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Last update: Wednesday, 23-Feb-2005 09:45:41 EST
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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 9.30 1983 0 m 1.14 2.15 1.89 1.09
November 5.04 1994 0 m 0.520 1.02 1.95 0.50
December 2.52 1994 0 m 0.140 0.46 3.21 0.14
January 0.796 1994 0 m 0.030 0.15 5.20 0.03
February 2.61 1984 0 m 0.240 0.56 2.31 0.23
March 64.6 1966 0 m 23.2 21.4 0.92 22.16
April 244 1979 0.192 1981 50.4 59.2 1.17 48.18
May 47.0 1979 0.042 1977 8.95 12.2 1.36 8.55
June 29.4 1994 0.001 1988 5.00 7.01 1.40 4.78
July 104 1993 0 m 8.67 21.6 2.49 8.28
August 43.4 1994 0 m 3.96 9.97 2.52 3.78
September 21.2 1993 0 m 2.41 5.49 2.28 2.30
Annual 24.3 1979 0.121 1977 8.73 6.78 0.78 100
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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 0.09 0 0 0 0 0 0 0 0 0
90 0 0 0 0.36 0.10 0 0 0 0 0 0 0 0
85 0 0 0 0.52 0.25 0 0 0 0 0 0 0 0
80 0 0 0 1.10 0.46 0.10 0 0 0 0 0 0 0
75 0 0 0 1.50 0.61 0.19 0 0 0 0 0 0 0
70 0 0 0 2.20 0.82 0.25 0 0 0 0 0 0 0
65 0 0 0 3.77 1.10 0.45 0 0 0 0 0 0 0
60 0 0 0 6.51 1.50 0.60 0.09 0 0 0 0 0 0
55 0 0 0.05 8.21 2.00 0.81 0.18 0 0 0 0 0 0
50 0 0 0.34 11.4 2.00 1.10 0.34 0 0 0 0.08 0 0.06
45 0 0 1.20 16.0 2.70 1.10 0.47 0 0.02 0.07 0.12 0 0.18
40 0 0 3.70 21.0 3.85 1.50 0.90 0.03 0.14 0.18 0.19 0 0.36
35 0 0 6.33 27.5 4.42 1.90 1.20 0.10 0.24 0.29 0.23 0 0.52
30 0 0 10.0 35.5 5.34 2.60 1.70 0.19 0.41 0.47 0.28 0 1.10
25 0 0 17.7 45.3 7.18 3.53 3.12 0.33 0.71 0.76 0.43 0 1.50
20 0 0 35.0 57.1 10.1 4.27 4.27 0.60 1.20 1.20 0.53 0.09 3.45
15 0 0 55.7 84.1 16.5 6.92 6.57 1.90 2.70 2.50 0.81 0.19 6.59
10 0 0.40 83.4 129 26.7 13.4 11.4 10.1 6.40 3.20 1.50 0.33 15.5
5 0.05 0.90 125 226 44.4 25.0 34.9 23.5 15.0 5.54 1.90 0.48 42.7
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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 3.6 1.33 0.770 0.534 0.357
0.95 1.05 16.0 7.72 5.11 3.62 2.42
0.90 1.11 32.9 17.5 12.2 8.63 5.75
0.80 1.25 73.4 42.2 30.6 21.7 14.3
0.50 2 281 167 124 85.7 55.7
0.20 5 843 457 328 216 137
0.10 10 1,370 676 469 301 188
0.04 25 2,150 941 625 389 240
0.02 50 2,790 1,120 719 439 269
0.01 100 3,440 1,270 795 478 291
0.005 200 4,110 1,400 856 508 307
0.002 500 5,000 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)
____________________________________________________________________________________
0.05 20 ng ng ng ng ng ng 0 0 0
0.10 10 ng ng ng ng ng ng 0 0 0
0.20 5 ng ng ng ng ng ng 0 0 0
0.50 2 ng ng ng ng ng ng 0 0.009 0.043
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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 ng ng ng 0 0 0 0
0.10 10 ng ng ng ng 0 0 0 0
0.20 5 ng ng ng ng 0 0 0 0.085
0.50 2 ng ng ng ng 0 0 0 1.02
June-July-August September-October-November
_________________________ ___________________________
0.05 20 0 0 0 0 0 0 0 0
0.10 10 0 0 0 0 0 0 0 0
0.20 5 0 0 0 0 0 0 0 0
0.50 2 0 0 0 0 0 0 0 0
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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)
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Annual peak discharge, by year, and corresponding gage height
1965 April 11 6.88 1,250 1980 March 31 3.72 100
1966 March 20 7.33 400 1981 July 17 2.89 10.0
1967 April 20 5.52 652 1982 March 30 5.74 700
1968 June 7 3.55 47.0 1983 June 21 4.53 259
1969 April 9 6.55 1,320 1984 March 25 -- 150
1970 June 16 6.49 1,270 1985 March 11 4.49 253
1971 April 5 4.77 392 1986 May 12 4.60 282
1972 May 26 5.65 736 1987 July 22 6.04 688
1973 March 14 4.35 170 1988 March 24 4.07 130
1974 April 11 -- 550 1989 April 5 4.55 230
1975 June 22 5.07 472 1990 June 30 2.67 9.70
1976 March 24 5.26 290 1991 May 23 2.65 7.80
1977 March 31 3.00 29.0 1992 March 5 -- 95.0
1978 March 28 7.28 950 1993 July 23 6.42 700
1979 April 19 8.35 1,900 1994 April 24 -- 170
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 19 8.35 1,900 1986 May 12 4.60 282
1969 April 9 6.55 1,320 1983 June 21 4.53 259
1970 June 16 6.49 1,270 1985 March 11 4.49 253
1965 April 11 6.88 1,250 1989 April 5 4.55 230
1978 March 28 7.28 950 1973 March 14 4.35 170
1972 May 26 5.65 736 1994 March 24 -- 170
1982 March 30 5.74 700 1984 March 25 -- 150
1993 July 23 6.42 700 1988 March 24 4.07 130
1987 July 22 6.04 688 1980 March 31 3.72 100
1967 April 20 5.52 652 1992 March 5 -- 95.0
1974 April 11 -- 550 1968 June 7 3.55 47.0
1975 June 22 5.07 472 1977 March 31 3.00 29.0
1966 March 20 7.33 400 1981 July 17 2.89 10.0
1971 April 5 4.77 392 1990 June 30 2.67 9.70
1976 March 24 5.26 290 1991 May 23 2.65 7.80
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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
__________________________________________________________________________________________________________________________________
1965 1.15 0.140 0 0 0 0 108.6 6.01 6.21 2.24 0.381 1.86 10.4
1966 1.33 0.119 0.061 0 0 64.6 14.4 9.07 3.63 11.8 5.09 0.269 9.32
1967 0.139 0.019 0 0 0 62.7 65.8 30.5 3.38 0.434 0.025 0 13.7
1968 0 0 0 0 0 10.7 2.86 0.891 8.24 3.45 0.440 1.31 2.33
1969 0.089 0.124 0.046 0 0 0 145.8 3.54 3.76 1.76 0 7.87 13.4
1970 1.28 0.454 0.270 0 0 0.387 126.1 13.2 15.8 0.120 0.005 0.687 13.1
1971 0.018 0.391 0.008 0 0 35.5 68.1 2.30 4.13 5.97 0.115 0.721 9.76
1972 4.30 1.45 0.090 0 0 43.5 68.1 24.6 1.73 0 0.001 0 12.0
1973 0 0 0 0 0.111 13.6 1.43 0.754 3.68 0.172 0 0 1.67
1974 4.48 0.687 0.088 0 0 0 131.5 39.4 16.5 5.18 3.22 0.127 16.7
1975 0.010 0.473 0.007 0 0 3.90 57.5 17.1 11.1 1.87 0 0 7.62
1976 0 0 0 0 0.172 37.3 13.6 1.21 0.056 0.053 0 0 4.40
1977 0 0 0 0 0 0.812 0.537 0.042 0.003 0.037 0 0.014 0.121
1978 0.185 0.209 0.315 0 0 44.0 86.0 3.28 0.309 0 0 0.691 11.2
1979 0.008 0 0 0 0 0 244.1 47.0 2.49 0.681 0.276 0.002 24.3
1980 0 0 0 0 0 7.56 8.66 0.307 0.001 0 0 0 1.38
1981 0 0 0 0 1.05 0.812 0.192 0.118 0.293 1.02 0.224 0.057 0.310
1982 1.08 0.458 0.005 0 0 28.4 28.8 2.49 1.09 0.053 0.118 0.001 5.23
1983 9.30 1.41 0.214 0.031 0.573 55.5 26.0 2.93 8.31 6.41 18.3 10.6 11.7
1984 3.76 1.87 0.361 0 2.61 34.6 33.9 4.52 1.39 0.013 0 0 6.91
1985 0 0 0 0 0.714 34.1 3.55 4.46 1.47 0.064 0.329 2.07 3.94
1986 1.26 0.614 0.149 0.011 0 47.4 25.8 16.3 0.285 8.95 0.320 1.88 8.67
1987 0.297 1.79 0.151 0 0 36.2 137.1 15.8 19.8 54.3 18.2 2.74 23.9
1988 0.321 0.264 0.017 0 0.083 32.0 19.9 0.371 0.001 5.78 0.458 0 4.95
1989 0 0 0 0 0 1.27 65.8 3.92 0.466 0 0 0 5.89
1990 0 0 0 0 0 0.247 0.863 0.137 1.65 0.402 0 0 0.273
1991 0 0 0 0 0 0.039 0.521 1.88 0.368 1.97 0.155 0 0.417
1992 0 0.060 0 0 1.24 29.3 1.52 1.92 2.06 2.65 0.066 0.190 3.29
1993 0 0.024 0 0 0 24.0 4.12 0.874 2.43 103.6 27.7 21.2 15.6
1994 5.09 5.04 2.52 0.796 0.723 47.6 22.1 13.5 29.4 41.0 43.4 20.1 19.4
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U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:45:41 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05064900.html |
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