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Pre-regulation period
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Statistics of monthly and annual mean discharges, pre-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 299 1945 0.435 1949 79.8 92.1 1.15 3.18
November 228 1945 3.32 1949 70.3 66.9 0.95 2.80
December 152 1952 1.73 1949 51.3 42.9 0.84 2.04
January 99.2 1952 0.800 1949 35.4 27.8 0.79 1.41
February 83.1 1952 0.400 1949 32.6 24.5 0.75 1.30
March 1,080 1945 0.461 1949 191 285 1.49 7.61
April 1,790 1947 173 1958 799 507 0.63 31.8
May 1,630 1950 99.0 1949 451 346 0.77 17.9
June 888 1953 9.15 1952 321 239 0.74 12.8
July 1,120 1944 8.82 1951 246 263 1.07 9.80
August 960 1944 3.93 1948 132 222 1.68 5.24
September 762 1944 0.183 1948 104 185 1.78 4.12
Annual 384 1945 90.4 1948 198 92.0 0.46 100
__________________________________________________________________________________________________________
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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 0.80 0.40 0.40 109 68.9 13.7 12.1 3.84 0.42 0.57 3.40 1.60 3.04
90 3.10 2.50 2.50 168 107 35.0 20.9 5.35 3.91 6.24 5.40 3.40 5.77
85 4.20 3.40 4.10 201 135 64.7 36.1 6.79 6.43 12.6 9.22 6.73 13.9
80 12.6 11.9 20.7 235 177 92.5 45.0 13.3 10.1 14.7 15.6 14.5 18.2
75 14.1 13.9 23.7 278 218 116 55.1 19.4 13.6 17.1 20.9 16.9 23.9
70 15.3 17.2 26.5 333 252 151 65.7 24.0 16.6 19.6 26.7 22.3 30.6
65 17.3 19.2 30.7 386 284 185 75.7 27.8 20.3 22.9 35.8 29.9 37.3
60 21.3 20.6 35.2 434 314 209 91.5 32.4 24.7 27.8 41.1 35.5 43.9
55 26.2 24.6 40.4 487 345 226 113 38.3 31.1 33.8 45.1 41.2 52.1
50 32.7 30.9 45.7 550 376 244 134 47.6 35.8 40.1 48.6 45.7 60.9
45 37.8 34.1 59.4 624 407 264 155 62.1 40.2 45.5 52.6 48.9 75.3
40 42.1 37.1 78.1 721 437 285 181 73.0 46.0 51.0 58.1 53.4 93.8
35 46.1 40.0 88.0 833 466 312 218 86.9 54.3 57.5 64.8 59.8 121
30 50.3 43.4 97.9 853 494 340 260 107 70.2 64.0 75.7 64.6 166
25 54.5 47.0 125 1,100 539 383 304 135 93.6 98.8 95.4 69.6 216
20 58.5 53.7 182 1,270 592 438 366 167 120 179 120 76.7 275
15 63.3 62.4 254 1,510 674 511 448 208 170 209 147 91.3 355
10 75.3 71.6 403 1,780 789 633 593 293 238 243 180 117 502
5 90.4 81.6 1,310 2,220 1,040 1,040 800 576 511 280 234 146 829
______________________________________________________________________________________________________________________
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Probability of annual high discharges, pre-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 1.01 355 312 279 233 167
0.95 1.05 615 543 482 394 293
0.90 1.11 808 716 632 512 386
0.80 1.25 1,100 983 685 692 528
0.50 2 1,890 1,720 1,500 1,170 901
0.20 5 3,030 2,810 2,430 1,850 1,420
0.10 10 3,770 3,550 3,050 2,300 1,750
0.04 25 4,670 4,480 3,830 2,850 2,130
0.02 50 5,320 5,150 4,390 3,240 2,400
0.01 100 5,930 5,800 4,940 3,610 2,650
0.005 200 6,520 6,440 5,470 3,970 2,880
0.002 500 7,260 ng ng ng ng
__________________________________________________________________________________________________
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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 0.440 0.846 1.50 1.93 2.52
0.10 10 0.800 1.13 1.31 2.11 12.20 2.28 3.35 4.12 5.21
0.20 5 2.36 3.23 3.66 4.78 15.50 6.20 7.72 9.17 11.4
0.50 2 9.52 11.9 13.2 14.1 20.2 23.6 25.9 30.2 38.4
____________________________________________________________________________________
1Graphical interpretation.
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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 1.16 1.18 1.19 1.27 1.09 1.10 1.16 1.67
0.10 10 2.67 2.75 2.79 2.96 2.72 2.76 2.97 5.00
0.20 5 6.40 6.62 6.77 7.15 6.98 7.18 8.00 15.8
0.50 2 22.7 23.5 24.2 25.4 26.4 28.6 34.7 86.9
June-July-August September-October-November
_________________________ __________________________
0.05 20 1.24 2.02 2.87 4.08 0 0 0 0.519
0.10 10 2.27 3.39 4.59 6.69 1.13 1.39 2.33 1.86
0.20 5 4.67 6.36 8.19 12.2 3.41 4.26 5.81 6.75
0.50 2 18.0 21.5 25.6 38.8 14.8 19.4 21.9 38.3
_____________________________________________________________________________________
Post-regulation period
----------------------------------------------------------------------------------------------------------
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 744 1972 7.68 1977 133 165 1.24 3.58
November 784 1972 10.3 1977 122 137 1.12 3.27
December 160 1972 1.08 1977 69.2 43.5 0.63 1.85
January 121 1986 0.092 1977 51.4 28.4 0.55 1.38
February 124 1984 0.219 1977 50.5 27.6 0.55 1.35
March 1,480 1966 23.4 1965 314 344 1.10 8.41
April 3,260 1978 106 1981 1,240 916 0.74 33.2
May 2,070 1985 56.1 1977 625 483 0.77 16.8
June 1,780 1962 36.7 1977 472 440 0.93 12.7
July 3,140 1975 11.9 1980 379 600 1.58 10.2
August 1,830 1993 1.07 1977 156 319 2.05 4.17
September 824 1973 0.722 1976 120 164 1.37 3.22
Annual 682 1975 28.9 1977 303 159 0.53 100
__________________________________________________________________________________________________________
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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 7.36 5.55 18.6 104 86.9 46.1 14.9 2.40 4.03 13.3 18.3 13.5 12.4
90 14.9 18.0 25.3 158 133 72.1 25.6 10.1 11.2 20.5 27.1 17.6 21.1
85 19.4 21.6 28.8 200 182 95.2 49.2 14.9 14.4 25.6 33.1 23.3 28.9
80 25.8 25.5 37.3 244 209 117 63.7 21.3 18.1 31.0 39.5 29.9 36.2
75 29.6 29.5 49.5 294 239 140 72.1 27.8 22.9 36.6 46.6 33.8 45.0
70 33.4 33.6 55.7 357 265 166 81.8 33.8 29.3 42.7 54.4 37.2 53.9
65 37.3 38.3 61.1 423 291 188 93.6 40.2 36.7 48.8 63.3 44.5 61.6
60 41.4 43.2 66.5 500 330 207 109 46.6 44.2 58.2 72.2 51.6 69.3
55 47.2 47.2 73.1 596 376 232 126 55.7 51.7 68.4 82.4 55.9 77.1
50 52.7 51.1 79.7 706 421 263 146 65.0 60.0 77.0 92.4 60.2 90.9
45 56.5 54.9 86.3 834 472 293 166 75.2 68.2 85.2 102 66.1 105
40 60.2 58.5 104 965 541 328 188 85.5 79.7 93.4 112 73.2 127
35 64.0 62.1 134 1,100 634 374 217 98.7 91.9 110 121 80.8 156
30 68.0 65.6 205 1,300 700 444 262 117 106 132 132 91.2 198
25 72.1 69.2 289 1,560 787 539 334 140 120 156 146 102 250
20 76.1 73.2 411 1,920 890 638 424 176 152 180 166 113 332
15 80.2 79.4 592 2,240 1,020 787 524 226 207 224 187 124 476
10 89.6 85.5 846 3,100 1,280 1,010 759 298 294 294 210 138 744
5 100 91.6 1,400 4,510 1,920 1,760 1,540 525 486 456 290 153 1,320
______________________________________________________________________________________________________________________
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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 250 202 165 133
0.95 1.05 870 562 465 372 299
0.90 1.11 1,160 833 697 552 442
0.80 1.25 1,620 1,300 1,100 861 682
0.50 2 2,980 2,750 2,380 1,830 1,400
0.20 5 5,270 5,140 4,550 3,430 2,500
0.10 10 6,990 6,800 6,090 4,550 3,220
0.04 25 9,340 8,870 8,040 5,960 4,070
0.02 50 11,200 10,400 9,450 6,960 4,650
0.01 100 13,100 11,800 10,800 7,930 5,180
0.005 200 15,100 13,100 12,100 8,850 5,670
0.002 500 17,900 ng ng ng ng
__________________________________________________________________________________________________
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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 0.336 0.384 0.434 0.596 1.01 1.90 3.13 6.78 10.5
0.10 10 1.18 1.31 1.47 1.88 2.92 5.18 7.56 12.6 17.1
0.20 5 4.14 4.50 4.96 5.92 8.40 13.5 17.7 23.4 28.8
0.50 2 22.0 23.1 25.0 27.3 32.8 42.2 49.2 54.3 64.5
____________________________________________________________________________________
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Probability of seasonal low discharges, post-regulation period
[ng, statistic not given]
_____________________________________________________________________________________
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 ng ng ng ng 5.02 5.46 6.70 28.0
0.10 10 ng ng ng ng 11.5 12.0 13.5 38.6
0.20 5 ng ng ng ng 25.1 25.5 27.4 57.2
0.50 2 ng ng ng ng 59.8 64.7 70.7 123
June-July-August September-October-November
_________________________ __________________________
0.05 20 0.873 1.09 1.66 3.99 1.07 1.44 1.86 4.11
0.10 10 2.63 3.26 4.43 8.38 3.28 4.10 5.00 8.52
0.20 5 8.11 9.89 12.2 18.7 9.70 11.5 13.3 18.2
0.50 2 38.7 45.2 50.9 65.2 36.7 43.2 47.2 54.6
_____________________________________________________________________________________
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Annual peak discharge and corresponding gage height, period of record
[--, 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
1944 July 15 16.07 2,260 1970 June 20 22.41 3,940
1945 March 18 -- 2,200 1971 April 10 13.20 1,500
1946 March 23 20.56 2,600 1972 April 15 23.24 4,550
1947 April 15 27.70 4,200 1973 September 6 13.03 1,630
1948 April 8 20.13 2,200 1974 April 16 26.21 5,590
1949 July 11 -- 738 1975 July 5 30.91 7,660
1950 May 10 -- 3,000 1976 March 30 20.22 2,120
1951 April 7 -- 2,570 1977 April 11 5.55 245
1952 April 11 -- 2,860 1978 April 10 31.42 9,350
1953 June 18 16.88 1,650 1979 April 21 32.30 8,800
1954 April 12 15.26 1,940 1980 April 5 17.36 1,800
1955 April 5 15.99 1,850 1981 May 24 14.50 1,840
1956 April 14 24.26 4,660 1982 April 3 22.51 3,280
1957 September 4 -- 1,250 1983 July 5 15.12 2,290
1958 July 7 8.16 633 1984 June 11 25.00 5,400
1959 April 6 8.92 540 1985 May 16 25.14 5,230
1960 April 8 16.48 1,600 1986 March 31 23.10 3,850
1961 May 17 10.66 1,080 1987 July 25 14.26 1,500
1962 June 13 22.26 3,680 1988 April 8 11.30 1,190
1963 June 3 13.89 1,670 1989 April 7 29.60 5,480
1964 April 23 17.55 2,690 1990 April 1 14.26 1,100
1965 April 14 29.44 6,800 1991 May 6 10.27 952
1966 March 31 28.30 4,120 1992 July 3 14.70 1,950
1967 April 1 20.57 3,250 1993 August 1 -- 3,680
1968 March 29 11.26 726 1994 April 3 20.30 2,600
1969 April 15 31.42 8,300
Annual peak discharge, from highest to lowest, and corresponding gage height
1978 April 10 31.42 9,350 1982 April 3 22.51 3,280
1979 April 21 32.30 8,800 1967 April 1 20.57 3,250
1969 April 15 31.42 8,300 1950 May 10 -- 3,000
1975 July 5 30.91 7,660 1952 April 11 -- 2,860
1965 April 14 29.44 6,800 1964 April 23 17.55 2,690
1974 April 16 26.21 5,590 1946 March 23 20.56 2,600
1989 April 7 29.60 5,480 1994 April 3 20.30 2,600
1984 June 11 25.00 5,400 1951 April 7 -- 2,570
1985 May 16 25.14 5,230 1983 July 5 15.12 2,290
1956 April 14 24.26 4,660 1944 July 15 16.07 2,260
1972 April 15 23.24 4,550 1945 March 18 -- 2,200
1947 April 15 27.70 4,200 1948 April 8 20.13 2,200
1966 March 31 28.30 4,120 1976 March 30 20.22 2,120
1970 June 20 22.41 3,940 1992 July 3 14.70 1,950
1986 March 31 23.10 3,850 1954 April 12 15.26 1,940
1962 June 13 22.26 3,680 1955 April 5 15.99 1,850
1993 August 1 -- 3,680 1981 May 24 14.50 1,840
1980 April 5 17.36 1,800 1990 April 1 14.26 1,100
1963 June 3 13.89 1,670 1961 May 17 10.66 1,080
1953 June 18 16.88 1,650 1991 May 6 10.27 952
1973 September 6 13.03 1,630 1949 July 11 -- 738
1960 April 8 16.48 1,600 1968 March 29 11.26 726
1971 April 10 13.20 1,500 1958 July 7 8.16 633
1987 July 25 14.26 1,500 1959 April 6 8.92 540
1957 September 4 -- 1,250 1977 April 11 5.55 245
1988 April 8 11.30 1,190
_____________________________________________________________________________________
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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
__________________________________________________________________________________________________________________________________
1944 -- -- -- -- -- -- 303.4 501.6 661.2 1,122 960.0 762.3 --
1945 299.0 227.6 138.5 76.0 63.4 1,077 1,451 670.8 243.5 99.6 93.9 148.8 383.6
1946 225.3 141.5 71.6 35.2 22.9 744.7 881.5 425.8 264.7 201.3 30.2 35.8 257.8
1947 191.5 112.7 70.3 54.5 46.7 176.6 1,789 662.8 735.1 98.0 13.6 5.99 328.5
1948 13.3 9.69 6.64 4.09 3.40 3.24 837.4 156.5 38.7 18.4 3.93 0.183 90.4
1949 0.435 3.32 1.73 0.800 0.400 0.461 226.9 99.0 203.7 428.3 274.5 55.4 108.6
1950 41.2 44.0 31.4 13.4 12.6 84.6 1,738 1,634 482.5 258.2 7.50 4.56 363.3
1951 6.19 4.75 3.56 3.03 2.81 8.16 798.9 196.7 71.8 8.82 7.76 16.6 93.4
1952 16.6 25.2 152.1 99.2 83.1 80.8 1,239 296.1 9.15 272.9 147.0 58.1 205.9
1953 31.7 42.7 48.5 36.9 36.6 197.6 500.4 439.8 887.8 559.5 236.3 89.3 259.4
1954 49.4 52.3 58.8 61.5 72.7 128.0 727.2 595.8 326.6 118.6 33.7 29.1 187.7
1955 42.4 50.4 29.9 21.9 31.0 33.0 608.9 283.0 261.3 140.3 171.1 14.7 140.5
1956 23.1 19.0 14.6 13.6 18.4 23.5 1,175 417.7 224.8 41.3 23.0 19.2 166.5
1957 16.9 43.7 18.5 14.4 14.4 161.2 427.4 322.4 331.3 365.1 108.6 346.5 181.1
1958 212.6 210.6 78.2 49.1 43.0 109.7 172.7 101.0 161.0 222.0 43.7 37.4 120.4
1959 35.8 70.9 43.9 22.3 19.4 118.7 301.6 301.1 268.3 212.2 88.4 37.9 127.1
1960 53.8 55.2 46.8 56.2 46.9 95.4 896.6 407.0 428.5 212.0 101.6 167.1 213.0
1961 97.3 81.6 57.0 40.0 36.2 208.1 304.2 600.4 183.0 54.4 24.8 34.8 144.3
1962 45.5 40.8 27.1 26.0 22.5 33.3 616.8 953.3 1,776 784.5 205.1 114.2 387.4
1963 84.2 95.1 52.3 10.4 5.72 112.1 474.3 369.0 802.7 129.6 55.0 62.5 187.4
1964 27.9 31.9 19.4 19.5 24.2 28.4 1,178 637.0 483.2 175.4 51.0 41.1 225.2
1965 90.7 65.2 28.8 29.7 31.4 23.4 2,259 750.6 731.5 242.8 68.7 75.9 364.6
1966 168.1 94.5 117.9 85.5 56.1 1,485 1,950 987.1 288.0 124.5 219.3 104.2 475.3
1967 79.5 67.7 55.0 61.4 68.9 308.7 1,570 643.3 521.8 252.7 43.8 17.2 306.9
1968 25.7 24.1 49.3 32.3 21.8 207.9 387.1 318.0 242.5 187.7 67.8 87.1 137.7
1969 135.7 106.1 62.1 55.9 61.7 71.1 2,478 544.6 304.6 167.6 51.1 37.5 337.7
1970 151.1 170.5 109.2 68.3 54.0 58.8 1,430 1,071 1,323 211.1 37.4 23.8 391.4
1971 35.4 78.6 45.6 34.8 37.6 195.4 794.6 332.1 161.6 75.5 36.1 121.1 162.0
1972 744.0 783.8 160.2 91.2 70.0 990.0 1,740 895.3 328.4 151.9 118.9 62.5 511.4
1973 76.0 79.0 37.8 39.6 43.2 407.1 244.8 204.6 142.4 82.0 83.0 823.7 188.3
1974 639.2 290.3 144.1 80.9 80.5 87.3 2,345 1,635 549.2 178.0 124.9 43.1 516.8
1975 66.5 157.6 69.3 61.6 65.6 99.4 2,155 1,156 880.5 3,136 213.9 82.1 682.1
1976 69.9 115.1 68.3 63.9 73.7 468.7 830.1 195.2 82.2 41.2 8.11 0.722 167.6
1977 7.68 10.3 1.08 0.092 0.219 28.8 167.4 56.1 36.7 12.7 1.07 25.5 28.9
1978 83.5 114.1 150.6 81.3 51.5 144.0 3,261 407.8 165.9 73.1 63.4 92.4 387.9
1979 49.4 39.5 32.1 29.8 29.2 61.1 3,060 1,134 418.2 603.0 79.5 46.2 464.0
1980 40.8 120.2 60.6 46.6 48.2 71.0 673.2 153.8 46.8 11.9 6.04 12.3 106.8
1981 26.7 29.2 15.4 8.94 12.3 52.4 105.5 178.5 144.9 176.9 148.0 168.7 89.3
1982 287.7 212.0 98.4 62.4 60.0 219.2 1,637 612.5 219.6 112.8 39.0 19.1 297.8
1983 265.4 166.4 66.7 46.9 46.4 721.6 358.3 175.3 422.4 775.7 168.6 100.5 278.2
1984 174.2 158.8 92.3 64.4 123.9 791.1 884.6 246.5 1,554 118.8 23.0 14.5 351.8
1985 -- -- -- -- -- -- -- 2,074 1,195 757.2 494.7 309.9 --
1986 257.1 186.4 127.8 120.9 102.0 600.5 2,366 1,611 494.1 207.1 87.9 124.2 524.3
1987 186.4 188.2 128.0 81.5 75.5 864.0 434.7 464.7 273.2 386.6 234.8 98.8 286.8
1988 117.9 101.5 92.3 66.0 59.5 467.3 717.3 206.7 54.8 16.2 22.4 30.8 162.6
1989 31.7 51.6 50.0 50.4 54.4 72.0 2,387 494.1 263.3 61.0 13.5 109.4 300.8
1990 41.8 56.2 17.3 16.1 19.6 139.9 488.4 304.4 280.2 71.9 12.3 3.89 120.9
1991 11.5 20.6 17.2 17.0 27.0 146.3 233.1 548.8 135.5 141.6 25.9 22.8 113.1
1992 24.3 35.2 36.5 36.8 39.0 492.5 205.6 226.4 112.6 597.9 261.4 307.7 199.2
1993 88.6 102.8 76.5 71.0 74.3 245.2 1,065 349.1 422.5 1,605 1,833 356.9 528.3
1994 133.5 114.5 104.1 84.5 77.3 343.5 1,116 696.8 721.7 836.9 239.5 419.9 408.0
__________________________________________________________________________________________________________________________________
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