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Last update: Tuesday, 31-Aug-2004 10:28:46 EDT
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Pre-regulation periiod
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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 51.9 1942 0.048 m 15.5 17.4 1.12 1.18
November 54.7 1945 0 m 19.8 17.0 0.86 1.50
December 21.6 1942 0 1940 11.1 9.43 0.85 0.85
January 15.3 1947 0 m 6.18 5.03 0.81 0.47
February 20.0 1943 0 m 6.21 5.95 0.96 0.47
March 470 1943 0 1940 168 187 1.11 12.8
April 2,080 1948 45.3 1938 702 637 0.91 53.4
May 960 1948 21.1 1939 177 256 1.44 13.5
June 407 1943 8.43 1938 109 109 1.00 8.29
July 131 1943 0.316 1940 52.2 38.6 0.74 3.97
August 74.5 1944 0.026 1939 26.7 23.5 0.88 2.03
September 100 1944 0.010 1939 20.3 29.9 1.47 1.55
Annual 277 1948 18.4 1939 110 74.9 0.68 100
__________________________________________________________________________________________________________
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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 33.0 19.0 3.53 0 0 0 0 0 0 0
90 0 0 0 53.0 26.7 6.25 0.10 0 0 0 0 0 0
85 0 0 0.60 82.1 33.9 10.0 2.00 0.40 0 0 0 0 0.19
80 0.18 0.18 2.40 106 52.5 19.0 9.60 1.00 0.10 0.18 0.10 0.10 0.97
75 0.26 0.28 4.65 131 60.2 25.2 15.9 2.50 0.20 0.26 0.28 0.18 3.67
70 0.67 2.10 5.78 148 64.1 34.4 22.1 4.74 0.25 0.57 1.70 0.55 5.43
65 3.10 3.80 6.34 178 67.9 50.9 27.2 6.77 1.00 0.69 6.40 4.40 7.64
60 3.70 3.80 8.58 213 72.4 63.4 31.8 9.06 1.60 1.00 12.8 6.79 10.2
55 5.19 3.80 10.8 254 79.3 72.2 36.1 11.5 2.60 3.30 16.3 7.96 12.3
50 5.86 4.94 13.3 321 86.3 80.5 40.4 15.2 4.99 6.65 18.1 8.50 18.1
45 6.39 5.39 17.2 468 94.3 87.4 45.0 19.1 6.91 11.3 19.8 9.89 23.7
40 7.28 5.85 21.9 687 104 94.2 49.7 22.6 10.8 17.3 21.7 11.7 31.1
35 8.41 6.35 35.0 815 122 101 56.1 26.2 16.0 20.7 23.6 13.0 41.1
30 9.74 7.11 56.8 969 147 116 64.0 30.0 24.7 23.3 25.6 14.6 54.0
25 10.2 7.48 98.8 1,120 174 136 74.9 34.9 30.2 26.1 28.1 16.6 70.7
20 10.6 7.85 220 1,280 205 162 87.3 41.4 35.0 30.5 32.3 18.3 91.7
15 11.1 9.58 450 1,450 236 195 99.7 51.6 40.1 38.4 40.6 20.0 130
10 11.5 11.7 672 1,710 287 243 114 66.2 55.1 46.9 49.1 30.3 212
5 12.9 15.7 921 2,250 417 360 140 102 83.0 56.1 62.9 34.7 570
______________________________________________________________________________________________________________________
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Probability of annual high discharges, pre-regulation period
__________________________________________________________________________________________________
Maximum average 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 1.01 113 127 96.5 81.0 56.8
0.95 1.05 239 252 205 174 124
0.90 1.11 349 358 299 254 184
0.80 1.25 540 538 462 396 291
0.50 2 1,170 1,120 1,000 863 651
0.20 5 2,350 2,200 2,020 1,730 1,340
0.10 10 3,280 3,060 2,830 2,420 1,900
0.04 25 4,580 4,270 3,950 3,370 2,690
0.02 50 5,620 5,260 4,850 4,130 3,320
0.01 100 6,710 6,300 5,790 4,910 3,990
0.005 200 7,840 7,400 6,770 5,720 4,680
__________________________________________________________________________________________________
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Probability of annual low discharges, pre-regulation period
____________________________________________________________________________________
Minimum average 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 0 0
0.10 10 0 0 0 0 0 0 0 0 0
0.20 5 0 0 0 0 0 0 0 0 0.559
0.50 2 0.553 0.685 0.903 1.34 2.57 5.76 7.01 9.74 13.6
____________________________________________________________________________________
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Probability of seasonal low discharges, pre-regulation period
_____________________________________________________________________________________________
Minimum average 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 8.12
0.20 5 0 0.056 0.066 0.086 0.493 0.914 2.12 18.9
0.50 2 0.875 1.16 2.58 4.54 3.38 4.76 8.51 43.1
June-July-August September-October-November
____________________________ ____________________________
0.05 20 0 0 0 0.036 0 0 0 0
0.10 10 0 0 0.002 0.197 0 0 0 0
0.20 5 0.135 0.349 0.503 1.14 0 0 0 0.049
0.50 2 3.36 6.53 9.91 13.6 0.865 1.53 1.98 3.11
_____________________________________________________________________________________________
Post-regulation period
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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 116 1983 1.29 1956 30.5 33.0 1.08 1.83
November 192 1983 2.19 1956 48.9 45.0 0.92 2.93
December 155 1972 6.27 1956 49.2 31.5 0.64 2.94
January 119 1972 2.66 1956 50.8 29.3 0.58 3.04
February 300 1994 7.17 1956 70.1 6,801 0.97 4.20
March 1,230 1966 10.0 1964 164 233 1.42 9.81
April 2,090 1969 3.19 1953 547 569 1.04 32.8
May 2,980 1950 9.77 1959 302 570 1.89 18.1
June 1,230 1950 8.49 1958 201 236 1.17 12.0
July 501 1994 10.2 1963 112 110 0.98 6.69
August 216 1966 7.94 1963 38.9 47.6 1.22 2.33
September 507 1994 2.29 m 55.7 109 1.96 3.34
Annual 537 1950 22.5 1959 130 115 0.88 100
__________________________________________________________________________________________________________
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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 10.9 8.93 9.34 3.88 10.4 9.73 8.16 2.50 1.60 1.30 7.50 9.32 5.36
90 15.7 14.1 14.0 9.53 12.4 13.6 10.5 5.63 3.84 4.39 11.3 14.7 9.54
85 20.0 17.9 17.0 14.3 14.5 16.6 13.4 8.33 8.00 6.98 13.1 18.9 11.9
80 23.4 21.1 20.5 18.4 17.1 19.5 15.9 10.8 10.5 10.6 14.4 24.8 14.5
75 25.8 23.1 24.7 27.2 19.9 23.0 18.1 12.5 12.4 12.2 15.6 27.1 16.5
70 30.0 26.7 30.2 38.3 28.1 29.8 20.4 13.8 14.0 13.4 17.9 30.7 18.7
65 38.0 29.9 38.2 58.5 37.6 41.0 24.7 15.0 15.3 14.3 21.2 36.7 21.6
60 40.8 35.2 48.9 79.9 58.7 53.2 28.6 16.3 16.3 15.1 24.7 40.5 24.5
55 43.7 42.3 57.7 127 74.3 68.2 33.8 17.6 17.3 15.9 27.4 43.1 29.6
50 47.2 46.3 65.5 193 104 83.8 41.4 19.0 18.3 16.8 30.5 45.8 35.4
45 50.7 51.3 75.8 260 134 105 48.6 20.4 19.3 17.9 37.2 48.0 42.0
40 53.3 57.5 88.1 318 169 128 60.3 21.8 20.9 19.2 42.8 50.0 48.9
35 55.9 63.8 105 401 204 158 77.3 23.3 23.6 20.5 48.2 51.9 57.3
30 58.4 68.4 134 566 248 197 101 26.4 26.5 21.8 53.5 53.9 65.7
25 63.1 75.2 181 799 306 268 129 31.5 32.5 26.5 60.5 57.2 86.0
20 72.3 94.8 231 1,000 372 315 190 40.0 40.8 37.8 84.0 62.5 115
15 84.8 124 272 1,290 461 378 252 67.3 61.4 45.3 98.8 77.2 173
10 98.5 183 332 1,690 655 466 332 101 110 68.3 111 94.8 279
5 112 241 762 2,340 1,230 629 427 183 296 112 153 113 528
______________________________________________________________________________________________________________________
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Probability of annual high discharges, post-regulation period
[ng, statistic not given]
__________________________________________________________________________________________________
Maximum average 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 35.2 24.3 17.7 16.3
0.95 1.05 201 108 78.3 56.9 47.5
0.90 1.11 316 185 138 101 80.5
0.80 1.25 523 337 262 193 147
0.50 2 1,200 911 773 586 415
0.20 5 2,320 2,040 1,900 1,500 1,020
0.10 10 3,100 2,900 2,840 2,310 1,550
0.04 25 4,030 4,120 4,160 3,490 2,330
0.02 50 4,680 4,830 5,180 4,440 2,960
0.01 100 5,280 5,620 6,220 5,450 3,640
0.005 200 5,830 6,370 7,260 6,480 4,340
__________________________________________________________________________________________________
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Probability of annual low discharges, post-regulation period
____________________________________________________________________________________
Minimum average 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 10.190 0.309 0.810 1.35 2.32 3.30 4.31 5.43 7.01
0.10 10 10.200 0.605 1.41 2.18 3.61 4.76 6.14 7.44 9.96
0.20 5 10.800 1.27 2.58 3.70 5.76 7.20 9.15 10.7 14.8
0.50 2 11.80 4.24 6.66 8.52 11.7 14.4 17.9 20.2 28.9
____________________________________________________________________________________
1Graphical interpretation.
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Probability of seasonal low discharges, post-regulation period
_________________________________________________________________________________________
Minimum average 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 3.76 4.64 5.97 7.30 0.687 1.76 2.86 4.06
0.10 10 6.74 7.88 9.59 12.1 1.48 3.10 4.67 7.38
0.20 5 12.2 13.6 15.7 20.1 3.49 5.96 8.39 14.7
0.50 2 27.6 29.8 32.3 39.8 14.5 18.9 25.0 48.4
June-July-August September-October-November
_________________________ ___________________________
0.05 20 0.339 1.84 3.05 6.77 0.373 1.18 1.81 2.70
0.10 10 0.792 2.83 4.02 7.72 0.744 2.13 3.01 4.19
0.20 5 1.90 4.53 5.64 9.40 1.60 3.99 5.24 6.82
0.50 2 6.49 9.79 10.8 15.7 5.62 10.4 12.5 15.4
_________________________________________________________________________________________
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Annual peak discharge and corresponding gage height, period of record
_____________________________________________________________________________________
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
1919 April 18 14.90 2,750 1964 June 28 6.56 643
1938 March 29 3.90 244 1965 April 16 14.93 3,080
1939 April 6 4.34 342 1966 March 28 14.27 3,350
1940 April 8 5.14 525 1967 April 10 9.03 1,570
1941 April 19 9.10 1,590 1968 June 13 8.48 1,220
1942 April 17 7.72 1,190 1969 April 19 17.62 4,520
1943 March 27 10.78 1,900 1970 April 20 8.47 1,370
1944 June 3 4.50 399 1971 April 21 10.27 1,820
1945 March 24 7.06 1,020 1972 April 16 7.23 1,070
1946 March 26 7.56 1,160 1973 March 14 6.32 761
1947 April 11 10.19 1,910 1974 April 22 10.74 2,160
1948 April 28 17.51 4,580 1975 June 30 10.27 1,960
1949 April 21 10.90 2,120 1980 August 29 7.00 765
1950 May 5 14.60 3,050 1981 April 2 5.91 542
1951 April 19 8.08 1,270 1982 April 14 10.95 1,990
1952 March 31 6.02 650 1983 March 13 11.26 2,030
1953 July 17 8.11 1,230 1984 April 6 10.43 1,950
1954 July 13 6.29 726 1985 May 17 6.37 680
1955 April 14 9.04 1,490 1986 April 19 11.04 2,100
1956 April 28 10.58 1,870 1987 April 13 11.43 2,300
1957 September 4 6.48 627 1988 February 28 4.80 150
1958 July 17 4.21 248 1989 March 30 8.38 850
1959 June 27 7.02 988 1990 July 11 4.59 278
1960 April 17 9.52 1,570 1991 August 24 3.37 77.0
1961 March 2 4.01 251 1992 March 8 8.59 1,260
1962 July 7 9.71 1,270 1993 July 28 17.30 3,830
1963 July 26 3.39 78.0 1994 April 9 9.00 1,530
Annual peak discharge, from highest to lowest, and corresponding gage height
1948 April 28 17.51 4,580 1943 March 27 10.78 1,900
1969 April 19 17.62 4,520 1956 April 28 10.58 1,870
1993 July 28 17.30 3,830 1971 April 21 10.27 1,820
1966 March 28 14.27 3,350 1941 April 19 9.10 1,590
1965 April 16 14.93 3,080 1960 April 17 9.52 1,570
1950 May 5 14.60 3,050 1967 April 10 9.03 1,570
1919 April 18 14.90 2,750 1994 April 9 9.00 1,530
1987 April 13 11.43 2,300 1955 April 14 9.04 1,490
1974 April 22 10.74 2,160 1970 April 20 8.47 1,370
1949 April 21 10.90 2,120 1951 April 19 8.08 1,270
1986 April 19 11.04 2,100 1962 July 7 9.71 1,270
1983 March 13 11.26 2,030 1992 March 8 8.59 1,260
1982 April 14 10.95 1,990 1953 July 17 8.11 1,230
1975 June 30 10.27 1,960 1968 June 13 8.48 1,220
1984 April 6 10.43 1,950 1942 April 17 7.72 1,190
1947 April 11 10.19 1,910 1946 March 26 7.56 1,160
1972 April 16 7.23 1,070 1981 April 2 5.91 542
1945 March 24 7.06 1,020 1940 April 8 5.14 525
1959 June 27 7.02 988 1944 June 3 4.50 399
1989 March 30 8.38 850 1939 April 6 4.34 342
1980 August 29 7.00 765 1990 July 11 4.59 278
1973 March 14 6.32 761 1961 March 2 4.01 251
1954 July 13 6.29 726 1958 July 17 4.21 248
1985 May 17 6.37 680 1938 March 29 3.90 244
1952 March 31 6.02 650 1988 February 28 4.80 150
1964 June 28 6.56 643 1963 July 26 3.39 78.0
1957 September 4 6.48 627 1991 August 24 3.37 77.0
_____________________________________________________________________________________
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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
__________________________________________________________________________________________________________________________________
1919 -- -- -- -- -- -- 1,580 -- -- -- -- -- --
1938 -- -- -- -- -- -- 45.3 26.6 8.43 -- 8.64 0.130 --
1939 0.223 0.213 0.158 0.252 0.332 67.7 114.5 21.1 14.6 1.65 0.026 0.010 18.4
1940 0.048 0 0 0 0 0 172.1 62.0 8.50 0.316 1.72 0.063 20.2
1941 0.048 0 0.016 0 0 68.0 953.3 116.8 131.7 59.8 18.0 44.4 115.1
1942 51.9 38.9 21.6 4.03 5.22 26.7 736.6 239.5 162.9 55.7 49.5 45.6 119.4
1943 25.0 23.9 10.8 9.56 20.0 470.0 904.2 186.6 406.8 130.7 39.7 8.00 186.0
1944 3.64 18.8 12.0 3.86 4.53 15.6 109.1 74.1 161.4 62.6 74.5 100.0 53.1
1945 21.3 54.7 31.0 10.4 12.4 447.6 168.0 91.2 79.4 26.5 25.8 12.1 82.3
1946 8.51 14.6 9.75 10.1 5.06 411.7 380.8 70.1 36.9 46.2 46.6 20.3 88.8
1947 35.5 24.7 11.5 15.3 8.61 230.9 629.5 87.1 95.2 35.5 12.8 1.59 98.8
1948 23.9 15.4 14.9 8.19 4.98 32.0 2,077 959.8 98.2 54.5 40.5 10.5 276.8
1949 0.790 26.1 10.8 6.25 7.20 80.7 1,254 188.3 103.4 100.5 3.03 1.23 147.5
1950 3.02 27.5 21.9 11.0 9.16 77.1 1,746 2,975 1,231 253.7 66.4 2.29 537.4
1951 13.2 30.7 26.6 25.9 24.0 73.2 555.9 325.5 95.3 47.2 22.3 27.5 105.5
1952 51.3 14.5 14.7 23.4 28.8 49.2 32.4 19.3 22.0 21.1 24.2 21.1 26.9
1953 15.1 11.9 13.7 23.1 36.2 18.2 3.19 22.2 112.0 133.1 9.22 12.3 34.2
1954 19.3 20.1 38.8 58.6 62.6 78.1 138.1 40.6 175.1 233.6 33.6 50.8 79.1
1955 41.7 99.9 98.5 84.3 33.4 23.3 253.5 69.3 255.8 229.5 17.1 2.29 100.7
1956 1.29 2.19 6.27 2.66 7.17 67.0 357.4 366.5 286.8 54.1 14.5 2.61 97.2
1957 7.19 38.0 52.5 54.7 63.4 45.4 17.0 33.9 64.8 46.5 43.5 289.2 62.6
1958 102.8 125.4 83.8 77.8 73.1 66.1 50.1 20.9 8.49 76.3 13.2 14.5 59.4
1959 17.0 28.4 39.8 38.9 33.7 29.0 9.97 9.77 29.9 14.1 9.84 9.93 22.5
1960 12.4 16.1 26.4 21.4 20.1 75.3 695.6 82.0 160.0 26.0 20.7 15.8 96.7
1961 12.6 27.8 45.1 43.3 36.5 31.1 13.7 13.1 14.3 15.2 11.7 15.9 23.3
1962 15.9 13.7 13.5 13.8 13.8 122.6 316.4 148.5 245.2 171.7 36.3 20.6 94.4
1963 18.7 40.2 50.7 50.2 48.7 37.2 13.4 13.2 18.8 10.2 7.94 10.9 26.6
1964 6.65 22.7 34.0 23.5 15.8 10.0 25.5 11.9 200.2 138.4 16.4 28.1 44.3
1965 29.4 50.7 50.5 53.9 48.1 149.5 1,411 225.6 108.8 208.3 1,45.2 78.3 212.5
1966 115.7 104.3 104.0 101.9 76.2 1,229 707.8 307.4 204.8 167.8 2,15.5 67.3 285.3
1967 16.8 43.9 75.9 68.1 154.1 206.6 1,012 512.1 56.8 27.7 17.5 17.8 183.3
1968 16.4 24.3 41.9 40.5 42.1 65.5 157.8 145.2 265.7 31.7 17.4 19.0 72.0
1969 20.7 59.9 51.6 63.1 208.2 186.1 2,091 333.8 97.5 156.1 16.9 18.1 272.6
1970 13.6 38.5 47.5 53.5 85.0 143.2 473.2 319.2 359.5 33.3 14.2 11.3 132.1
1971 13.9 24.0 39.4 37.3 119.7 263.3 691.3 167.5 234.1 192.1 25.9 25.2 152.1
1972 49.3 132.2 154.7 119.3 45.2 269.3 876.3 319.7 191.0 25.1 20.5 22.6 184.9
1973 19.2 45.7 50.2 55.3 64.0 103.3 36.9 16.9 14.7 10.5 18.9 19.1 37.8
1974 18.0 31.0 34.5 63.4 198.9 245.4 1,008 727.1 508.0 18.3 18.1 13.0 239.0
1975 12.7 36.5 54.2 54.5 58.6 72.6 759.5 915.1 254.8 167.5 57.9 20.3 205.9
1982 -- -- -- -- -- -- -- -- -- 168.5 44.9 15.0 --
1983 116.0 191.9 84.5 87.0 -- -- -- -- -- -- -- -- --
1985 -- -- -- -- -- -- -- -- -- -- -- -- --
1987 -- -- -- -- -- -- 1,429 -- -- -- -- -- --
1990 -- -- 24.7 18.4 16.5 15.8 -- -- -- -- -- -- --
1991 -- -- -- -- -- -- -- -- -- -- -- -- --
1992 17.7 26.8 60.5 50.3 41.3 437.9 -- -- -- 64.0 31.7 39.0 --
1993 20.9 14.1 35.2 106.1 138.5 278.4 283.4 130.2 115.2 -- -- 274.7 --
1994 96.8 125.1 -- -- 300.2 447.9 710.4 177.0 307.8 500.7 137.5 507.0 --
__________________________________________________________________________________________________________________________________
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U.S. Geological Survey Maintainer: Webmaster Last update: Tuesday, 31-Aug-2004 10:28:46 EDT Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr97416/htdocs/f.05058500.html |
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