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Last update: Wednesday, 23-Feb-2005 09:46:14 EST
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URL: http://nd.water.usgs.gov/pubs/ofr/ofr9821/htdocs/l.05099400.html
Pre-regulation period, 1956-70
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Statistics of monthly and annual mean discharges, pre-regulation period
[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 3.26 1969 0.177 1962 1.27 0.98 0.77 0.45
November 2.86 1957 0.177 1962 1.04 0.75 0.73 0.37
December 1.05 1966 0.229 1962 0.620 0.28 0.45 0.22
January 0.834 1967 0.016 1958 0.420 0.27 0.64 0.15
February 0.946 1969 0 m 0.340 0.28 0.83 0.12
March 139 1966 0 1962 25.7 38.6 1.50 9.07
April 461 1970 6.05 1958 172 162 0.94 60.6
May 150 1967 2.34 1958 43.5 50.0 1.15 15.3
June 102 1970 0.440 1958 19.6 24.8 1.27 6.90
July 62.6 1970 0.181 1961 11.8 18.9 1.60 4.16
August 21.6 1957 0.010 1961 4.26 5.76 1.35 1.50
September 17.0 1970 0.090 1961 3.15 5.11 1.62 1.11
Annual 61.8 1970 1.78 1958 21.6 17.3 0.80 100
__________________________________________________________________________________________________________
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Monthly and annual flow duration, in cubic feet per second, pre-regulation period
______________________________________________________________________________________________________________________
Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
______________________________________________________________________________________________________________________
95 0 0 0 0.89 1.80 0.28 0.17 0 0.10 0.20 0.20 0.20 0
90 0 0 0 2.50 2.30 1.30 0.36 0.10 0.10 0.29 0.29 0.20 0.12
85 0 0 0.17 4.37 2.90 1.70 0.61 0.19 0.10 0.29 0.29 0.30 0.17
80 0.10 0 0.29 5.75 4.67 2.90 1.00 0.19 0.18 0.37 0.33 0.30 0.24
75 0.19 0 0.29 7.45 6.03 4.00 1.30 0.36 0.26 0.37 0.37 0.30 0.34
70 0.19 0.09 0.38 10.0 7.99 4.80 1.30 0.44 0.26 0.42 0.37 0.40 0.34
65 0.19 0.09 0.38 12.5 11.5 5.59 1.70 0.55 0.32 0.47 0.52 0.40 0.49
60 0.28 0.20 0.50 15.6 14.4 6.77 2.20 0.68 0.32 0.67 0.59 0.40 0.70
55 0.28 0.20 0.50 19.1 16.2 7.95 2.20 0.83 0.39 0.76 0.74 0.52 0.70
50 0.28 0.30 0.50 24.5 18.1 9.33 2.20 1.00 0.57 0.96 0.84 0.60 1.00
45 0.37 0.30 0.65 32.4 20.1 11.4 2.90 1.30 0.69 1.20 0.84 0.68 1.00
40 0.37 0.34 0.65 42.0 22.2 12.7 2.90 1.60 0.69 1.20 0.94 0.68 1.40
35 0.55 0.38 0.65 55.0 26.2 14.1 4.04 1.90 1.20 1.40 0.94 0.78 2.00
30 0.55 0.49 0.85 73.7 32.6 16.2 4.85 2.40 1.80 1.50 1.20 0.78 3.44
25 0.63 0.56 1.10 101 40.2 18.6 5.60 2.40 2.20 1.70 1.30 0.90 5.03
20 0.63 0.56 4.40 156 51.4 22.1 7.11 3.70 3.20 2.20 1.30 0.90 9.97
15 0.72 0.64 19.1 250 69.4 27.2 9.58 7.87 6.20 2.50 1.70 1.00 15.8
10 0.72 0.72 44.8 466 93.5 35.7 14.8 13.1 9.07 2.80 1.90 1.00 24.9
5 0.94 0.93 169 1,050 179 59.5 33.5 17.8 14.6 3.20 2.40 1.10 66.3
______________________________________________________________________________________________________________________
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Probability of occurrence of annual high discharges, pre-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 ng 6.81 5.29 5.19 3.69
0.95 1.05 ng 36.2 26.1 20.0 13.0
0.90 1.11 283 78.3 54.7 37.8 23.6
0.80 1.25 514 179 120 75.8 45.9
0.50 2 1,470 640 407 230 136
0.20 5 3,720 1,590 965 536 323
0.10 10 5,780 2,250 1,340 758 468
0.04 25 8,940 2,990 1,760 1,030 655
0.02 50 11,600 3,450 2,020 1,210 790
0.01 100 14,600 3,840 2,230 1,380 918
0.005 200 17,800 4,160 2,400 1,520 1,040
0.002 500 22,300 ng ng ng ng
__________________________________________________________________________________________________
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Probability of occurrence of annual low discharges, pre-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 0 0 0 0 0 0.044 0.109 0.142
0.10 10 0 0 0 0 0 0 0.077 0.157 0.208
0.20 5 0 0 0 0 0 0.049 0.139 0.235 0.316
0.50 2 0.061 0.070 0.098 0.135 0.179 0.239 0.337 0.442 0.623
________________________________________________________________________________________________
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Probability of occurrence of seasonal low discharges, pre-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 0 0 0 0 0 0 0
0.10 10 0 0 0 0 0 0 0 0.144
0.20 5 0 0 0 0 0 0 0 0.433
0.50 2 0.072 0.119 0.171 0.227 0.358 0.396 0.400 2.33
June-July-August September-October-November
____________________________ _______________________________
0.05 20 0 0 0 0 0 0 0.046 0.087
0.10 10 0.071 0.083 0.100 0.115 0.058 0.064 0.081 0.130
0.20 5 0.149 0.196 0.245 0.339 0.130 0.148 0.152 0.208
0.50 2 0.372 0.534 0.698 1.30 0.349 0.401 0.431 0.495
______________________________________________________________________________________________
Post-regulation period, 1971-82
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Statistics of monthly and annual mean discharges, post-regulation period
[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 5.45 1981 0.356 1976 1.99 1.68 0.850 0.750
November 3.94 1971 0.283 1977 1.42 1.12 0.790 0.530
December 1.29 1971 0.053 1977 0.550 0.400 0.730 0.210
January 0.629 1971 0 1973 0.260 0.220 0.840 0.100
February 30.1 1981 0 m 2.73 8.62 3.16 1.03
March 93.4 1972 0.319 1975 20.2 28.4 1.41 7.60
April 457 1974 4.92 1973 176 169 0.960 66.2
May 255 1974 2.85 1973 41.6 72.2 1.74 15.7
June 37.6 1974 1.09 1980 10.9 11.4 1.05 4.10
July 35.8 1976 0.451 1973 6.50 10.1 1.55 2.45
August 6.25 1976 0.379 1981 1.69 1.63 0.960 0.640
September 6.84 1977 0.238 1972 1.98 2.22 1.12 0.750
Annual 63.2 1974 3.57 1973 22.0 18.8 0.860 100
__________________________________________________________________________________________________________
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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 0 0.10 0.39 1.40 0.72 0.21 0.08 0.09 0.33 0.28 0.03 0.06
90 0 0 0.21 2.00 1.80 1.00 0.28 0.09 0.11 0.33 0.34 0.05 0.09
85 0 0 0.28 3.40 2.20 1.30 0.37 0.12 0.18 0.38 0.34 0.10 0.20
80 0.08 0.04 0.36 3.40 3.40 1.50 0.49 0.22 0.22 0.44 0.38 0.20 0.28
75 0.08 0.07 0.36 5.13 4.52 2.20 0.49 0.28 0.28 0.58 0.59 0.28 0.28
70 0.10 0.10 0.46 6.72 5.44 2.20 0.66 0.35 0.34 0.76 0.66 0.28 0.28
65 0.11 0.10 0.46 11.4 6.74 2.70 0.88 0.35 0.34 0.88 0.74 0.34 0.41
60 0.11 0.10 0.59 16.1 8.15 3.20 0.88 0.43 0.43 1.00 0.83 0.34 0.60
55 0.19 0.13 0.59 26.7 10.3 3.20 1.20 0.53 0.53 1.10 0.92 0.34 0.60
50 0.22 0.17 0.59 36.9 12.4 3.90 1.20 0.53 0.67 1.30 0.92 0.34 0.87
45 0.25 0.22 0.76 57.5 14.0 4.94 1.60 0.66 0.67 1.50 1.00 0.40 0.87
40 0.25 0.22 0.98 79.1 16.1 5.56 2.10 0.82 0.83 1.50 1.10 0.55 1.30
35 0.29 0.29 1.30 95.9 18.8 6.28 2.10 0.82 0.83 1.70 1.10 0.55 1.80
30 0.33 0.29 2.70 111 25.2 7.40 3.24 1.00 1.00 1.70 1.40 0.66 2.90
25 0.33 0.39 4.70 151 34.2 9.07 3.93 1.00 1.30 2.30 1.60 0.66 3.94
20 0.43 0.39 13.9 190 47.9 13.0 4.55 1.30 1.60 2.60 2.20 0.77 5.97
15 0.50 0.39 28.2 273 69.7 16.8 5.80 1.90 2.00 3.00 2.70 0.92 10.9
10 0.57 0.52 54.1 426 116 24.0 10.2 3.00 3.10 3.50 3.00 1.10 26.1
5 0.74 0.69 99.6 1,030 175 37.0 23.4 5.15 6.77 6.10 3.40 1.30 89.6
______________________________________________________________________________________________________________________
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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 37.5 23.5 16.9 11.0 6.78
0.95 1.05 94.6 52.4 39.0 25.6 17.4
0.90 1.11 153 80.9 61.0 40.0 28.0
0.80 1.25 272 138 105 68.5 48.8
0.50 2 786 389 298 189 132
0.20 5 2,180 1,130 848 518 329
0.10 10 3,660 1,990 1,470 872 512
0.04 25 6,280 3,680 2,650 1,510 802
0.02 50 8,850 5,490 3,870 2,160 1,060
0.01 100 12,000 7,900 5,450 2,960 1,340
0.005 200 15,800 11,000 7,470 3,960 1,660
0.002 500 21,800 ng ng ng ng
__________________________________________________________________________________________________
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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 0 0 0 0 0 0.015 0.087 0.199
0.10 10 0 0 0 0 0 0 0.033 0.126 0.256
0.20 5 0.006 0.012 0.013 0.015 0.035 0.067 0.074 0.190 0.350
0.50 2 0.050 0.057 0.070 0.092 0.131 0.175 0.241 0.387 0.646
_____________________________________________________________________________________________________
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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 0 0 0 0 0 0.128 0.299
0.10 10 0 0 0 0 0.089 0.084 0.163 0.461
0.20 5 0.013 0.023 0.023 0.044 0.137 0.156 0.227 0.781
0.50 2 0.142 0.139 0.144 0.155 0.258 0.358 0.466 2.17
June-July-August September-October-November
______________________________ _______________________________
0.05 20 0.021 0.044 0.063 0.172 0.028 0.038 0.130 0.218
0.10 10 0.035 0.066 0.099 0.224 0.044 0.062 0.161 0.265
0.20 5 0.065 0.108 0.163 0.312 0.075 0.107 0.213 0.342
0.50 2 0.190 0.267 0.385 0.610 0.196 0.272 0.377 0.597
__________________________________________________________________________________________________
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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
1956 April 21 10.15 2,800 1970 April 25 13.95 6,600
1957 August 1 7.73 447 1971 April 9 13.26 4,480
1958 July 5 6.75 20.0 1972 March 17 9.56 626
1959 April 3 9.38 996 1973 August 9 7.02 211
1960 April 11 13.28 4,160 1974 April 16 12.43 3,190
1961 March 25 7.46 300 1975 April 12 7.80 347
1962 April 18 12.79 3,100 1976 April 2 12.39 2,450
1963 July 26 10.11 1,310 1977 May 19 7.57 368
1964 April 9 7.90 337 1978 April 6 10.06 1,600
1965 April 10 13.36 2,770 1979 April 19 12.44 3,200
1966 April 1 11.62 2,380 1980 March 31 6.21 140
1967 May 6 11.47 2,230 1981 March 12 6.98 200
1968 March 25 7.82 270 1982 March 30 8.29 464
1969 April 9 12.76 6,000
Annual peak discharge, from highest to lowest, and corresponding gage height
1970 April 25 13.95 6,600 1959 April 3 9.38 996
1969 April 9 12.76 6,000 1972 March 17 9.56 626
1971 April 9 13.26 4,480 1982 March 30 8.29 464
1960 April 11 13.28 4,160 1957 August 1 7.73 447
1979 April 19 12.44 3,200 1977 May 19 7.57 368
1974 April 16 12.43 3,190 1975 April 12 7.80 347
1962 April 18 12.79 3,100 1964 April 9 7.90 337
1956 April 21 10.15 2,800 1961 March 25 7.46 300
1965 April 10 13.36 2,770 1968 March 25 7.82 270
1976 April 2 12.39 2,450 1973 August 9 7.02 211
1966 April 1 11.62 2,380 1981 March 12 6.98 200
1967 May 6 11.47 2,230 1980 March 31 6.21 140
1978 April 6 10.06 1,600 1958 July 5 6.75 20.0
1963 July 26 10.11 1,310
_____________________________________________________________________________________
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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; --, no data]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1956 -- -- -- -- -- -- 404.3 137.5 21.7 6.46 2.08 2.42 --
1957 1.46 2.86 1.00 0.648 0.204 41.4 11.4 7.78 4.99 2.38 21.6 10.2 8.91
1958 2.75 1.62 0.784 0.016 0.293 3.20 6.05 2.34 0.440 3.46 0.165 0.190 1.78
1959 0.345 0.363 0.313 0.381 0.411 32.0 100.1 14.6 15.9 2.53 0.297 0.240 13.9
1960 1.76 1.57 0.735 0.681 0.600 0.739 307.9 18.2 4.46 0.819 0.268 0.107 27.8
1961 0.387 0.280 0.300 0.165 0 23.8 10.4 3.48 2.80 0.181 0.010 0.090 3.52
1962 0.177 0.177 0.229 0.084 0 0 284.5 42.6 25.1 13.9 7.39 1.09 31.0
1963 1.14 0.993 0.439 0.074 0 9.11 8.53 4.28 23.7 50.9 5.51 0.353 8.83
1964 0.345 0.397 0.342 0.268 0.410 0.290 57.6 13.0 13.3 2.86 0.810 2.55 7.60
1965 2.36 0.983 0.448 0.300 0.118 0.342 176.3 34.1 10.4 2.64 1.25 1.49 19.1
1966 1.59 1.20 1.05 0.559 0.186 139.0 172.6 92.6 16.3 15.0 9.29 0.682 37.7
1967 1.01 0.932 0.723 0.834 0.687 58.5 178.4 149.5 11.0 2.41 0.832 0.283 33.9
1968 0.471 0.447 0.535 0.671 0.377 50.2 11.6 14.7 6.11 3.99 7.86 10.2 9.00
1969 3.26 1.94 0.832 0.668 0.946 1.24 389.3 23.4 35.1 7.02 1.21 0.358 38.3
1970 0.663 0.778 0.885 0.503 0.514 0.556 461.0 94.6 102.2 62.6 5.34 17.0 61.8
1971 5.06 3.94 1.29 0.629 0.466 1.16 363.1 21.9 14.6 5.16 1.06 0.801 34.6
1972 2.32 2.40 0.400 0.241 0.053 93.4 117.9 15.1 3.15 0.536 0.485 0.238 19.7
1973 0.710 1.19 0.092 0 0 27.7 4.92 2.85 1.10 0.451 2.35 0.892 3.57
1974 1.86 0.929 0.736 0.521 0.416 0.538 457.4 255.1 37.6 2.54 2.06 0.953 63.2
1975 1.51 1.44 0.424 0.100 0.100 0.319 55.5 19.2 3.42 1.88 0.600 0.449 7.04
1976 0.356 0.360 0.360 0.360 0.638 1.68 267.0 11.2 27.1 35.8 6.25 0.507 29.0
1977 0.426 0.283 0.053 0.004 0 3.60 11.5 17.6 2.93 0.868 0.401 6.84 3.72
1978 2.51 0.765 1.25 0.602 0.348 14.8 284.2 34.7 8.27 3.44 0.971 3.41 29.4
1979 1.01 0.768 0.334 0.226 0.200 0.626 402.5 101.0 16.1 11.3 2.55 3.97 44.8
1980 1.71 1.02 0.584 0.278 0.221 9.80 32.2 3.02 1.09 2.40 1.94 4.90 4.90
1981 5.45 3.00 0.766 0.126 30.1 40.4 10.3 5.55 4.29 0.866 0.379 0.313 8.33
1982 0.899 0.911 0.273 0.080 0.231 47.8 99.6 12.3 10.9 12.7 1.25 0.517 15.6
__________________________________________________________________________________________________________________________________
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