Maintainer: Webmaster
Last update: Wednesday, 23-Feb-2005 09:46:17 EST
Privacy || Disclaimer|| Accessibility || FOIA
URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05101000.html
Post-regulation period, 1955-94
----------------------------------------------------------------------------------------------------------
Statistics of monthly and annual mean discharges, post-regulation period
__________________________________________________________________________________________________________
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 30.1 1981 0.513 1962 6.70 6.60 0.98 2.69
November 22.7 1981 0.560 1976 7.26 5.17 0.71 2.92
December 12.9 1971 0.700 1976 4.82 3.25 0.68 1.94
January 7.27 1971 1.23 1955 3.42 1.70 0.50 1.37
February 18.7 1981 0.571 1962 3.91 3.58 0.92 1.57
March 135 1966 0.216 1964 21.5 27.6 1.28 8.65
April 294 1956 0.428 1991 108 93.2 0.86 43.3
May 225 1974 1.63 1980 49.2 63.9 1.30 19.8
June 78.7 1964 0.473 1988 18.2 19.5 1.07 7.33
July 107 1993 0.086 1978 11.5 17.6 1.53 4.63
August 144 1993 0.208 1988 7.99 22.6 2.83 3.21
September 28.3 1980 0.096 1989 6.51 7.56 1.16 2.62
Annual 50.1 1956 3.11 1961 22.9 14.1 0.62 100
________________________________________________________________________________________________________
----------------------------------------------------------------------------------------------------------------------
Monthly and annual flow duration, in cubic feet per second, post-regulation period
______________________________________________________________________________________________________________________
Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
______________________________________________________________________________________________________________________
95 0.97 0.60 0.16 0.33 2.10 0.30 0.12 0.16 0.14 0.47 1.10 0.64 0.47
90 1.20 0.70 0.43 1.90 3.97 1.00 0.42 0.40 0.24 0.69 1.40 1.20 0.67
85 1.30 1.10 1.10 6.00 5.32 1.90 1.10 0.54 0.33 1.00 1.80 1.30 0.96
80 1.60 1.30 1.40 9.34 6.43 2.99 1.40 0.73 0.58 1.20 2.20 1.70 1.40
75 1.80 1.50 1.40 12.2 7.85 3.51 1.90 0.98 0.78 1.50 2.20 1.90 1.90
70 2.00 1.80 1.80 15.7 9.32 4.05 2.64 0.98 0.78 1.80 2.80 2.40 1.90
65 2.00 1.80 2.30 19.9 11.8 4.60 3.06 1.30 1.00 2.20 2.80 2.80 2.89
60 2.40 1.80 3.00 24.5 14.3 5.40 3.48 1.80 1.40 2.70 3.60 3.10 3.30
55 2.40 2.10 4.05 29.8 16.6 5.89 3.93 1.80 1.90 3.30 4.70 3.10 3.90
50 3.00 2.50 4.70 39.3 19.1 7.79 4.38 2.40 2.50 3.30 5.13 3.50 4.32
45 3.30 2.90 5.35 52.6 21.6 9.67 5.17 2.40 3.37 4.00 5.77 4.00 4.75
40 3.30 3.40 6.67 66.8 25.3 11.7 5.71 2.40 3.92 5.17 6.30 4.50 6.14
35 3.70 3.40 11.2 85.0 29.5 13.9 7.33 3.57 4.68 5.84 7.41 4.50 7.15
30 4.10 4.00 17.0 108 36.8 16.1 8.47 3.99 6.12 6.55 7.89 5.70 9.49
25 4.50 4.00 22.6 134 47.7 20.1 10.5 4.84 7.46 7.74 9.43 5.70 12.6
20 4.50 4.00 30.1 170 63.7 26.1 12.7 6.60 9.64 9.93 11.0 6.50 16.8
15 5.00 5.90 38.8 232 82.7 34.0 17.1 9.05 13.0 12.8 13.9 7.30 24.7
10 5.50 6.91 53.8 343 128 50.2 25.0 12.7 17.5 15.7 16.6 9.57 43.8
5 6.80 11.4 104 488 228 77.0 37.9 24.0 25.9 21.3 21.3 13.3 108
______________________________________________________________________________________________________________________
--------------------------------------------------------------------------------------------------
Probability of occurrence of annual high discharges, post-regulation period
[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 11.7 15.4 10.9 8.45 5.87
0.95 1.05 32.2 43.4 32.3 23.9 16.4
0.90 1.11 52.8 71.1 54.2 39.6 27.1
0.80 1.25 92.8 122 95.8 69.4 47.3
0.50 2 244 296 242 177 121
0.20 5 556 590 502 380 261
0.10 10 811 789 682 532 368
0.04 25 1,170 1,030 900 727 507
0.02 50 1,450 1,190 1,050 870 610
0.01 100 1,740 1,330 1,190 1,010 711
0.005 200 2,030 1,460 1,310 1,140 808
0.002 500 2,410 ng ng ng ng
__________________________________________________________________________________________________
------------------------------------------------------------------------------------
Probability of occurrence of annual low discharges, post-regulation period
__________________________________________________________________________________________________
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 0.037 0.056 0.065 0.076 0.151 0.336 0.484 0.633 1.18
0.10 10 0.063 0.088 0.102 0.126 0.231 0.467 0.673 0.942 1.58
0.20 5 0.114 0.149 0.172 0.226 0.373 0.683 0.980 1.44 2.20
0.50 2 0.331 0.392 0.448 0.611 0.855 1.33 1.88 2.72 3.87
__________________________________________________________________________________________________
-------------------------------------------------------------------------------------
Probability of occurrence of seasonal low discharges, post-regulation period
_________________________________________________________________________________________________
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 0.396 0.414 0.509 0.704 0.037 0.064 0.103 0.423
0.10 10 0.555 0.579 0.667 0.906 0.087 0.139 0.225 0.834
0.20 5 0.819 0.852 0.950 1.22 0.229 0.335 0.543 1.79
0.50 2 1.63 1.69 1.77 2.10 1.11 1.48 2.44 6.52
June-July-August September-October-November
________________________________ _______________________________
0.05 20 0.047 0.067 0.094 0.207 0.067 0.142 0.174 0.270
0.10 10 0.096 0.137 0.188 0.378 0.123 0.218 0.264 0.424
0.20 5 0.209 0.296 0.400 0.738 0.243 0.368 0.440 0.728
0.50 2 0.720 1.00 1.36 2.24 0.775 1.01 1.20 2.01
____________________________________________________________________________________________________
-------------------------------------------------------------------------------------
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
1950 April 18 48.70 11,800 1973 March 24 9.85 118
1952 April 1 38.48 260 1974 April 22 15.61 595
1953 May 31 35.86 178 1975 April 25 10.38 76.0
1954 June 12 35.53 187 1976 April 9 13.31 313
1955 April 2 13.23 700 1977 July 18 10.40 64.0
1956 April 19 14.23 1,350 1978 April 10 14.28 429
1957 March 22 6.12 340 1979 April 22 16.75 900
1958 July 5 2.38 78.0 1980 April 6 11.86 180
1959 April 5 9.04 485 1981 March 25 10.73 76.0
1960 April 14 8.67 654 1982 April 14 12.95 308
1961 March 27 4.56 60.0 1983 April 8 12.89 354
1962 April 23 7.03 473 1984 April 14 12.89 33.0
1963 June 12 4.57 210 1985 March 20 12.13 243
1964 June 20 5.38 286 1986 March 25 12.35 275
1965 April 14 8.10 580 1987 April 8 13.79 480
1966 April 2 7.35 492 1988 April 6 8.71 38.0
1967 May 9 6.28 412 1989 April 24 9.48 49.0
1968 March 27 5.55 160 1990 April 24 8.82 15.0
1969 April 14 7.85 606 1991 June 19 9.45 35.0
1970 April 29 7.99 567 1992 March 9 10.77 80.0
1971 April 12 7.75 568 1993 July 29 14.11 492
1972 April 16 5.79 325 1994 April 12 14.11 138
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 18 48.70 11,800 1976 April 9 13.31 313
1956 April 19 14.23 1,350 1982 April 14 12.95 308
1979 April 22 16.75 900 1964 June 20 5.38 286
1955 April 2 13.23 700 1986 March 25 12.35 275
1960 April 14 8.67 654 1952 April 1 38.48 260
1969 April 14 7.85 606 1985 March 20 12.13 243
1974 April 22 15.61 595 1963 June 12 4.57 210
1965 April 14 8.10 580 1954 June 12 35.53 187
1971 April 12 7.75 568 1980 April 6 11.86 180
1970 April 29 7.99 567 1953 May 31 35.86 178
1966 April 2 7.35 492 1968 March 27 5.55 160
1993 July 29 14.11 492 1994 April 12 14.11 138
1959 April 5 9.04 485 1973 March 24 9.85 118
1987 April 8 13.79 480 1992 March 9 10.77 80.0
1962 April 23 7.03 473 1958 July 5 2.38 78.0
1978 April 10 14.28 429 1975 April 25 10.38 76.0
1967 May 9 6.28 412 1981 March 25 10.73 76.0
1983 April 8 12.89 354 1977 July 18 10.40 64.0
1957 March 22 6.12 340 1961 March 27 4.56 60.0
1972 April 16 5.79 325 1989 April 24 9.48 49.0
1988 April 6 8.71 38.0 1984 April 14 12.89 33.0
1991 June 19 9.45 35.0 1990 April 24 8.82 15.0
_____________________________________________________________________________________
---------------------------------------------------------------------------------------------------------------------------------
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
__________________________________________________________________________________________________________________________________
1951 -- -- -- -- -- -- 450.9 586.9 40.7 -- -- -- --
1952 3.54 2.81 2.07 1.25 1.00 4.57 46.8 5.90 1.91 1.24 0.542 0.583 5.97
1953 1.25 0.880 0.065 0.506 0.236 2.03 9.84 18.9 15.5 2.41 4.64 1.68 4.84
1954 2.59 2.52 1.24 0.635 1.09 7.06 36.0 18.5 51.7 4.13 3.09 7.32 11.3
1955 5.54 4.68 1.92 1.23 1.60 1.61 167.5 18.1 22.5 34.9 2.01 1.95 21.8
1956 17.4 4.39 3.03 3.40 4.23 3.92 294.2 208.8 32.7 13.9 4.69 11.8 50.1
1957 5.77 15.8 5.90 2.88 1.50 40.1 28.5 21.5 13.2 6.25 7.78 20.6 14.2
1958 6.21 5.53 3.34 2.21 2.38 9.41 15.6 6.38 3.95 11.9 1.12 0.953 5.77
1959 2.70 2.21 1.70 2.10 1.86 5.54 100.0 20.2 7.91 2.65 0.994 2.45 12.4
1960 3.71 3.06 3.37 2.64 2.03 1.85 196.6 38.2 6.22 2.23 1.09 1.00 21.6
1961 1.76 3.14 1.26 1.37 0.829 13.7 9.20 3.93 0.733 0.465 0.477 0.277 3.11
1962 0.513 2.51 2.00 1.28 0.571 0.494 128.9 81.7 66.8 21.3 9.92 7.42 26.9
1963 9.45 12.8 1.51 4.86 5.22 5.16 11.4 9.50 67.4 17.0 8.44 7.34 13.3
1964 6.18 3.82 6.55 2.01 1.43 0.216 83.2 35.6 78.7 17.8 4.38 11.0 20.8
1965 19.0 10.5 5.41 4.46 2.59 5.58 214.6 107.1 36.4 10.6 5.91 9.67 35.9
1966 14.1 8.21 9.74 5.15 3.04 134.9 206.1 143.9 13.3 31.4 8.20 3.52 48.7
1967 7.71 13.2 4.77 3.05 2.88 35.1 159.0 181.2 1.91 2.94 0.871 3.21 34.8
1968 1.14 4.85 10.2 6.12 5.12 19.9 26.3 38.4 15.9 14.3 7.98 5.27 13.0
1969 7.19 9.02 9.03 2.34 3.25 6.34 256.4 37.3 10.8 7.66 1.17 0.561 29.0
1970 0.783 5.40 7.60 6.40 6.37 5.52 215.6 190.8 46.5 6.45 4.25 3.18 41.6
1971 7.75 14.3 12.9 7.27 2.11 1.88 253.1 39.8 46.7 15.2 2.16 1.09 33.5
1972 2.45 12.3 3.53 2.16 3.45 50.9 110.1 22.6 5.36 5.29 2.50 3.02 18.6
1973 5.73 3.88 3.14 3.43 3.80 36.0 13.7 8.53 4.03 3.51 1.28 0.883 7.37
1974 3.07 3.52 4.37 4.29 3.20 11.4 246.9 224.8 27.3 2.77 0.972 0.653 44.5
1975 4.10 9.31 6.75 5.37 4.52 3.67 31.2 27.6 3.17 3.02 3.34 2.67 8.73
1976 1.46 0.560 0.700 3.99 4.56 4.73 141.8 5.45 30.8 1.79 2.00 1.62 16.4
1977 1.22 2.23 1.95 1.72 1.66 7.09 4.03 4.26 4.30 7.67 1.60 2.08 3.33
1978 3.54 8.24 10.3 3.65 9.07 13.7 205.6 30.8 3.48 0.086 0.805 0.206 23.9
1979 2.87 2.29 1.31 1.65 8.35 19.2 249.7 184.1 23.3 18.2 4.06 20.2 44.6
1980 5.19 5.39 4.90 4.74 4.21 7.27 37.1 1.63 0.828 0.741 9.62 28.3 9.09
1981 30.1 22.7 5.08 4.60 18.7 28.8 47.3 19.9 19.6 6.28 6.63 13.6 18.5
1982 11.0 9.38 2.74 1.29 0.834 12.7 97.9 37.6 27.6 14.8 6.04 7.77 19.1
1983 -- -- -- -- -- 54.6 111.5 18.6 7.82 3.51 1.56 2.85 --
1984 -- -- -- -- -- 2.67 22.1 9.32 7.83 7.86 0.900 3.26 --
1985 -- -- -- -- -- 76.9 56.0 13.0 11.0 12.0 28.9 17.9 --
1986 -- -- -- -- -- 82.3 124.9 68.0 10.8 22.8 10.9 19.6 --
1987 -- -- -- -- -- 39.6 269.7 20.5 7.61 3.28 0.821 1.64 --
1988 -- -- -- -- -- 5.27 14.1 6.81 0.473 0.453 0.208 0.244 --
1989 -- -- -- -- -- 15.5 14.4 4.96 5.04 0.936 1.54 0.096 --
1990 -- -- -- -- -- 1.55 6.27 6.76 6.12 1.95 1.43 1.41 --
1991 -- -- -- -- -- 0.734 0.428 10.5 17.4 6.10 6.29 3.69 --
1992 -- -- -- -- -- 34.4 21.3 15.6 7.66 8.52 3.45 7.19 --
1993 -- -- -- -- -- 20.8 48.0 32.1 23.6 107.3 143.7 25.9 --
1994 -- -- -- -- -- 40.2 71.7 12.5 3.13 5.16 9.67 4.39 --
__________________________________________________________________________________________________________________________________
|
U.S. Department of the Interior ||
U.S. Geological Survey Maintainer: Webmaster Last update: Wednesday, 23-Feb-2005 09:46:17 EST Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05101000.html |
|