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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 1.05 1981 0 m 0.070 0.21 2.92 0.18
November 0.538 1981 0 m 0.030 0.10 3.34 0.08
December 1.02 1983 0 m 0.030 0.18 5.47 0.08
January 0.012 1994 0 m 0 0 5.74 0
February 11.4 1981 0 m 0.350 1.98 5.74 0.90
March 77.5 1992 0 m 5.56 14.0 2.51 14.4
April 117 1974 0.003 1963 22.0 30.7 1.39 57.3
May 43.9 1974 0 m 4.44 9.31 2.09 11.6
June 9.34 1986 0 m 1.14 2.35 2.06 2.97
July 57.4 1993 0 m 3.09 10.5 3.41 8.04
August 17.1 1968 0 m 1.07 3.49 3.26 2.78
September 16.7 1968 0 m 0.640 2.92 4.55 1.67
Annual 13.8 1974 0.003 1977 3.19 3.25 1.02 100
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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 0 0 0 0 0 0 0 0 0
90 0 0 0 0 0 0 0 0 0 0 0 0 0
85 0 0 0 0 0 0 0 0 0 0 0 0 0
80 0 0 0 0.06 0.02 0 0 0 0 0 0 0 0
75 0 0 0 0.08 0.04 0 0 0 0 0 0 0 0
70 0 0 0 0.16 0.06 0 0 0 0 0 0 0 0
65 0 0 0 0.44 0.08 0 0 0 0 0 0 0 0
60 0 0 0 0.62 0.14 0 0 0 0 0 0 0 0
55 0 0 0 1.20 0.18 0 0 0 0 0 0 0 0
50 0 0 0 1.70 0.24 0.02 0 0 0 0 0 0 0
45 0 0 0 3.53 0.43 0.03 0 0 0 0 0 0 0
40 0 0 0 5.03 0.58 0.05 0 0 0 0 0 0 0
35 0 0 0 6.68 0.77 0.09 0 0 0 0 0 0 0
30 0 0 0 8.44 1.40 0.11 0.04 0 0 0 0 0 0
25 0 0 0.20 13.2 1.80 0.19 0.10 0 0 0 0 0 0.06
20 0 0 0.89 19.8 2.50 0.44 0.33 0 0 0 0 0 0.16
15 0 0 4.57 28.9 4.86 0.98 1.00 0 0 0.08 0.02 0 0.62
10 0 0 12.1 50.8 10.3 2.20 2.50 0.16 0.14 0.17 0.06 0 2.57
5 0 0 33.0 101 24.9 5.36 10.6 1.90 2.40 0.29 0.14 0 10.7
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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 ng 0.069 0.064 0.041 0.021
0.95 1.05 7.40 1.03 0.834 0.540 0.295
0.90 1.11 15.4 3.44 2.66 1.72 0.963
0.80 1.25 35.2 12.1 8.92 5.74 3.31
0.50 2 140 75.2 52.6 33.4 20.0
0.20 5 433 238 165 103 62.6
0.10 10 715 349 243 150 91.8
0.04 25 1,140 461 323 197 121
0.02 50 1,500 520 368 223 137
0.01 100 1,870 563 400 242 149
0.005 200 2,250 593 424 255 157
0.002 500 2,760 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 ng ng 0
0.10 10 ng ng ng ng ng ng ng ng 0
0.20 5 ng ng ng ng ng ng ng ng 0
0.50 2 ng ng ng ng ng ng ng ng 0
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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 ng 0 0 0
0.10 10 ng ng ng ng ng 0 0 0
0.20 5 ng ng ng ng ng 0 0 0
0.50 2 ng ng ng ng ng 0 0 0.033
June-July-August September-October-November
_________________________ ___________________________
0.05 20 ng ng ng 0 ng ng 0 0
0.10 10 ng ng ng 0 ng ng 0 0
0.20 5 ng ng ng 0 ng ng 0 0
0.50 2 ng ng ng 0 ng ng 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)
_____________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
1962 April 6 -- 40.0 1979 April 23 10.50 1,200
1963 July 25 5.23 8.90 1980 April 3 7.51 90.0
1964 April 9 -- 32.0 1981 February 21 7.65 95.0
1965 April 11 7.09 124 1982 March 30 8.01 214
1966 March 14 6.92 66.0 1983 April 2 7.99 155
1967 April 21 6.73 128 1984 March 24 7.70 264
1968 August 24 7.17 218 1985 March 17 7.69 60.0
1969 April 12 8.80 700 1986 June 21 7.45 276
1970 April 29 7.20 317 1987 April 5 8.14 281
1971 April 10 8.11 637 1988 April 4 6.12 4.60
1972 March 16 7.62 354 1989 April 8 6.23 66.0
1973 June 20 6.51 52.0 1990 April 3 5.79 5.10
1974 April 21 8.61 1,060 1991 August 6 - 6.00
1975 April 28 7.93 405 1992 March 29 - 264
1976 April 1 8.12 330 1993 July 19 8.30 355
1977 April 11 5.42 0.10 1994 March 24 - 224
1978 April 6 7.73 200
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 23 10.50 1,200 1983 April 2 7.99 155
1974 April 21 8.61 1,060 1967 April 21 6.73 128
1969 April 12 8.80 700 1965 April 11 7.09 124
1971 April 10 8.11 637 1981 February 21 7.65 95.0
1975 April 28 7.93 405 1980 April 3 7.51 90.0
1993 July 19 8.30 355 1966 March 14 6.92 66.0
1972 March 16 7.62 354 1989 April 8 6.23 66.0
1976 April 1 8.12 330 1985 March 17 7.69 60.0
1970 April 29 7.20 317 1973 June 20 6.51 52.0
1987 April 5 8.14 281 1962 April 6 -- 40.0
1986 June 21 7.45 276 1964 April 9 -- 32.0
1984 March 24 7.70 264 1963 July 25 5.23 8.90
1992 March 29 -- 264 1991 August 6 -- 6.00
1994 March 24 -- 224 1990 April 3 5.79 5.10
1968 August 24 7.17 218 1988 April 4 6.12 4.60
1982 March 30 8.01 214 1977 April 11 5.42 0.100
1978 April 6 7.73 200
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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
__________________________________________________________________________________________________________________________________
1962 0 0 0 0 0 0 6.91 0.323 0.083 0 0 0 0.602
1963 0 0 0 0 0 0.023 0.003 0 0.457 0.016 0 0 0.041
1964 0 0 0 0 0 0 9.51 0.597 0.433 0.048 0.110 0.343 0.907
1965 0.248 0.010 0 0 0 0 26.4 16.9 2.78 4.95 0.071 0 4.29
1966 0 0 0 0 0 9.26 1.01 1.80 0.026 1.65 0.085 0 1.17
1967 0 0 0 0 0 2.58 14.6 2.83 0.008 0 0 0 1.66
1968 0 0 0 0 0 0.125 0.060 0.025 0.006 0 17.1 16.7 2.84
1969 0.505 0.184 0.046 0 0 0 88.4 1.51 0.037 0.788 0.002 0 7.53
1970 0 0 0 0 0 0.020 29.1 27.7 0.265 19.5 1.17 0.099 6.53
1971 0.009 0.013 0 0 0 0 57.5 1.91 3.70 12.4 0.325 0 6.27
1972 0.049 0.034 0 0 0 24.3 13.2 1.31 0.810 0.699 0.047 0 3.39
1973 0 0 0 0 0.004 0.940 0.032 0.076 8.17 1.81 0 0.690 0.971
1974 0.052 0.004 0 0 0 0 117.0 43.9 5.95 0 0.014 0 13.8
1975 0 0 0 0 0 0 71.1 9.15 0.653 0.047 0 0 6.68
1976 0 0 0 0 0 7.22 54.6 0.815 0.003 0 0 0 5.15
1977 0 0 0 0 0 0 0.031 0 0 0 0 0 0.003
1978 0 0 0 0 0 0 25.1 0.429 0.008 0 0 0 2.10
1979 0 0 0 0 0 0 92.0 15.8 0.661 0 0 0 8.96
1980 0 0 0 0 0 0 6.25 0.024 0 0 0.005 1.06 0.602
1981 1.05 0.538 0 0 11.4 4.82 0.291 2.19 1.89 0.038 0 0 1.78
1982 0 0 0 0 0 4.58 18.4 5.32 0.250 0.011 0 0 2.38
1983 0.096 0.117 1.02 0 0.002 2.84 30.7 2.91 0.173 1.30 0.001 0 3.24
1984 0 0 0 0 0 8.45 4.64 6.44 0.010 0 0 0 1.64
1985 0 0 0 0 0 15.1 1.28 0.053 0.021 0.012 0.006 0 1.40
1986 0.010 0 0 0 0 6.86 6.10 2.47 9.34 0.882 0.009 0 2.14
1987 0 0 0 0 0 5.68 23.6 0.087 0 0 7.31 0.008 3.05
1988 0 0 0 0 0 0 0.324 0.004 0 0 0 0 0.027
1989 0 0 0 0 0 0 4.00 0.064 0.009 0 0 0 0.335
1990 0 0 0 0 0 0.098 1.00 0.058 0.021 0 0 0 0.097
1991 0 0 0 0 0 0.116 0.180 0.242 0.034 0.103 0.082 0.028 0.066
1992 0.004 0.013 0.002 0 0 77.5 11.7 0.939 0.012 0 0 0 7.61
1993 0 0 0 0 0 4.47 6.95 0.423 1.81 57.4 8.90 2.23 6.95
1994 0.317 0.067 0.003 0.012 0 8.36 4.50 0.374 0.071 0.347 0.001 0 1.18
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U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:46:10 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05098700.html |
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