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Statistics of monthly and annual mean discharges
__________________________________________________________________________________________________________
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 153 1958 0.400 1991 19.0 34.5 1.81 1.82
November 87.5 1957 0.381 1990 11.2 19.3 1.72 1.07
December 34.5 1992 0.131 1987 4.59 5.74 1.25 0.44
January 12.1 1992 0.116 1987 2.81 2.56 0.91 0.27
February 23.6 1981 0.120 1987 3.20 4.07 1.27 0.31
March 362 1986 0.658 1934 59.8 89.6 1.50 5.70
April 1,980 1966 0.539 1991 398 387 0.97 37.9
May 1,340 1970 0.984 1991 189 274 1.45 18.1
June 1,340 1970 1.43 1980 161 268 1.66 15.4
July 1,140 1956 0.437 1988 106 223 2.11 10.1
August 1,350 1993 0.089 1988 48.2 189 3.93 4.60
September 525 1957 0 1937 45.7 107 2.34 4.36
Annual 312 1966 2.89 1934 87.5 76.6 0.88 100
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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 0.29 0.18 0.46 2.10 2.00 1.10 0.53 0.24 0.24 0.41 0.37 0.36 0.41
90 0.34 0.38 0.63 4.35 3.67 2.00 1.30 0.71 0.60 0.84 0.46 0.43 0.59
85 0.47 0.55 1.10 7.76 5.08 3.83 1.80 1.00 0.81 1.10 0.73 0.51 1.20
80 0.64 0.80 1.10 15.8 7.28 4.93 2.62 1.40 1.10 1.30 0.91 0.74 1.20
75 1.00 0.97 1.60 24.8 12.1 5.62 3.74 1.40 1.50 1.70 1.10 1.50 1.80
70 1.40 1.20 1.60 33.7 16.1 7.88 4.26 2.10 1.50 1.70 1.40 1.80 1.80
65 1.40 1.40 2.10 50.8 20.7 11.0 4.98 2.10 2.00 2.20 2.20 1.80 2.63
60 1.70 1.40 2.10 73.2 25.6 14.0 5.52 2.10 2.00 2.70 2.20 2.20 3.05
55 2.00 1.70 3.00 102 31.4 17.2 7.36 3.36 2.81 3.50 2.80 2.20 3.47
50 2.00 1.70 3.42 139 38.1 21.8 9.31 3.78 3.25 4.44 3.50 2.60 4.23
45 2.30 1.70 3.85 184 49.5 28.8 12.6 4.40 3.70 4.87 3.50 2.60 4.72
40 2.30 2.10 4.54 234 72.7 38.3 16.0 4.82 4.33 5.30 3.50 3.10 6.59
35 2.70 2.10 5.95 299 103 52.3 20.2 6.12 5.47 6.27 4.60 3.80 9.51
30 2.70 2.50 10.2 382 142 74.0 26.3 7.33 7.35 8.00 5.34 3.80 15.1
25 3.20 3.00 17.0 496 213 127 39.2 9.94 11.0 11.7 7.23 4.50 23.7
20 3.20 3.00 34.2 662 290 210 58.3 14.4 19.8 18.5 11.8 4.50 41.5
15 4.40 3.70 57.2 904 377 299 109 22.5 47.5 27.6 20.3 8.09 83.9
10 5.20 5.45 131 1,220 541 429 214 67.3 116 49.3 30.0 11.7 199
5 9.95 9.94 417 1,780 929 795 646 216 261 102 53.4 15.7 494
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Probability of occurrence of annual high discharges
[ng, statistic not given]
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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 57.3 41.0 25.0 15.8
0.95 1.05 337 166 128 83.9 53.3
0.90 1.11 462 275 219 148 94.5
0.80 1.25 667 478 394 274 176
0.50 2 1,280 1,170 1,000 730 477
0.20 5 2,330 2,320 2,040 1,520 1,020
0.10 10 3,100 3,090 2,730 2,040 1,380
0.04 25 4,140 3,990 3,520 2,630 1,810
0.02 50 4,940 4,590 4,040 3,010 2,090
0.01 100 5,770 5,120 4,490 3,350 2,340
0.005 200 6,610 5,590 4,890 3,630 2,560
0.002 500 7,740 ng ng ng ng
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Probability of occurrence of annual low discharges
__________________________________________________________________________________________
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 0.015 0.015 0.050 0.092 0.187 0.302 0.387 0.458 0.947
0.10 10 0.098 0.103 0.123 0.183 0.295 0.451 0.569 0.647 1.21
0.20 5 0.247 0.264 0.287 0.354 0.492 0.710 0.884 0.982 1.71
0.50 2 0.836 0.890 0.939 0.978 1.18 1.54 1.90 2.17 3.81
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Probability of occurrence of seasonal low discharges
_____________________________________________________________________________________________
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 0.252 0.258 0.264 0.298 0.177 0.202 0.343 0.679
0.10 10 0.375 0.385 0.392 0.441 0.338 0.393 0.514 1.10
0.20 5 0.592 0.608 0.619 0.694 0.631 0.753 0.814 2.01
0.50 2 1.30 1.35 1.39 1.55 1.60 2.02 13.00 6.85
June-July-August September-October-November
_____________________________ _____________________________
0.05 20 0.042 0.103 0.235 0.544 0.153 0.214 0.294 0.353
0.10 10 0.193 0.282 0.431 0.803 0.246 0.338 0.429 0.525
0.20 5 0.515 0.726 0.845 1.35 0.434 0.587 0.695 0.876
0.50 2 1.84 2.70 2.89 4.20 1.25 1.66 1.91 2.58
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1Graphical interpretation.
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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)
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Annual peak discharge, by year, and corresponding gage height
1929 March 20 9.00 940 1967 April 21 11.43 2,430
1930 May 15 10.90 1,820 1968 July 19 11.08 2,290
1931 April 9 6.00 300 1969 April 14 14.01 3,520
1932 April 11 9.70 1,310 1970 April 14 14.51 4,140
1933 April 4 7.58 415 1971 April 8 9.00 1,500
1934 April 10 5.00 64.0 1972 April 15 8.50 1,480
1935 April 13 7.21 565 1973 March 14 10.18 800
1936 April 19 6.64 358 1974 April 24 11.35 2,460
1937 May 4 7.02 594 1975 July 6 10.37 1,960
1941 April 11 10.09 1,580 1976 April 1 7.24 980
1942 April 1 12.05 2,210 1977 April 8 5.06 219
1943 April 11 8.31 1,050 1978 April 12 12.12 2,770
1944 June 12 7.46 820 1979 April 22 13.17 3,340
1945 April 16 6.96 670 1980 April 8 6.90 820
1946 March 26 7.03 668 1981 June 30 5.39 340
1947 June 17 9.07 1,290 1982 April 2 7.94 1,040
1954 June 16 7.03 567 1983 March 8 9.33 1,530
1955 June 9 8.33 1,020 1984 April 3 6.45 623
1956 April 24 12.79 2,650 1985 June 26 12.16 2,790
1957 July 8 10.52 1,810 1986 March 29 11.47 2,510
1958 September 23 6.29 355 1987 March 27 7.62 996
1959 April 8 8.60 1,110 1988 March 24 8.46 1,170
1960 April 11 8.72 1,270 1989 April 19 10.78 2,100
1961 March 26 6.86 451 1990 April 1 7.10 784
1962 June 13 12.82 2,960 1991 July 13 11.35 2,160
1963 April 8 7.56 1,570 1992 April 2 10.82 1,870
1964 June 14 10.88 2,210 1993 August 10 12.87 3,050
1965 April 15 12.30 2,780 1994 March 26 -- 850
1966 April 5 18.23 5,410
Annual peak discharge, from highest to lowest, and corresponding gage height
1966 April 5 18.23 5,410 1942 April 1 12.05 2,210
1970 April 14 14.51 4,140 1964 June 14 10.88 2,210
1969 April 14 14.01 3,520 1991 July 13 11.35 2,160
1979 April 22 13.17 3,340 1989 April 19 10.78 2,100
1993 August 10 12.87 3,050 1975 July 6 10.37 1,960
1962 June 13 12.82 2,960 1992 April 2 10.82 1,870
1985 June 26 12.16 2,790 1930 May 15 10.90 1,820
1965 April 15 12.30 2,780 1957 July 8 10.52 1,810
1978 April 12 12.12 2,770 1941 April 11 10.09 1,580
1956 April 24 12.79 2,650 1963 April 8 7.56 1,570
1986 March 29 11.47 2,510 1983 March 8 9.33 1,530
1974 April 24 11.35 2,460 1971 April 8 9.00 1,500
1967 April 21 11.43 2,430 1972 April 15 8.50 1,480
1968 July 19 11.08 2,290 1932 April 11 9.70 1,310
1947 June 17 9.07 1,290 1945 April 16 6.96 670
1960 April 11 8.72 1,270 1946 March 26 7.03 668
1988 March 24 8.46 1,170 1984 April 3 6.45 623
1959 April 8 8.60 1,110 1937 May 4 7.02 594
1943 April 11 8.31 1,050 1954 June 16 7.03 567
1982 April 2 7.94 1,040 1935 April 13 7.21 565
1955 June 9 8.33 1,020 1961 March 26 6.86 451
1987 March 27 7.62 996 1933 April 4 7.58 415
1976 April 1 7.24 980 1936 April 19 6.64 358
1929 March 20 9.00 940 1958 September 23 6.29 355
1994 March 26 -- 850 1981 June 30 5.39 340
1944 June 12 7.46 820 1931 April 9 6.00 300
1980 April 8 6.90 820 1977 April 8 5.06 219
1973 March 14 10.18 800 1934 April 10 5.00 64.0
1990 April 1 7.10 784
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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
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1929 10.0 8.13 3.71 2.16 2.00 311.9 160.7 36.1 23.0 7.39 1.00 1.50 47.7
1930 5.50 4.93 2.82 1.98 1.00 1.52 159.6 440.5 20.3 14.4 3.72 3.37 55.5
1931 4.94 4.19 2.95 2.16 2.00 24.9 83.1 15.6 8.97 4.98 4.45 3.47 13.4
1932 4.44 5.41 4.42 3.48 2.43 2.55 360.8 117.3 8.06 4.41 4.91 2.16 43.0
1933 2.88 3.87 2.74 2.00 1.36 14.6 191.5 21.2 14.2 2.28 2.46 2.25 21.6
1934 1.62 1.25 0.665 0.465 0.400 0.658 20.0 2.85 1.83 1.37 1.82 1.99 2.89
1935 4.60 3.72 2.24 1.00 0.800 29.5 163.8 35.4 7.24 4.46 1.92 2.84 21.4
1936 3.25 3.47 2.24 1.74 1.50 2.10 83.4 18.8 2.93 1.69 3.91 2.55 10.5
1937 23.9 -- -- -- -- -- -- 182.1 13.9 2.30 1.65 0 --
1941 -- -- -- -- -- -- 453.9 41.2 178.2 11.6 4.80 19.7 --
1942 131.1 23.6 5.99 3.00 2.57 154.4 675.4 456.5 45.7 5.83 15.6 35.0 129.9
1943 6.85 3.36 2.03 1.71 2.59 35.3 459.0 253.9 607.3 113.7 7.80 1.54 124.0
1944 0.887 -- -- -- -- -- 79.9 13.2 402.7 55.9 11.5 14.0 --
1945 6.65 23.0 11.6 -- -- -- 417.9 197.5 44.0 16.2 9.47 51.5 --
1946 34.2 12.6 5.58 3.41 2.41 220.4 248.4 29.8 5.76 15.0 3.72 2.99 48.9
1947 1.24 3.34 5.08 3.20 1.38 12.5 184.4 33.8 478.3 32.3 43.1 12.2 67.0
1954 5.32 0.867 1.16 2.45 6.36 2.80 208.5 135.2 167.7 9.79 5.51 3.97 45.6
1955 4.94 4.00 2.98 2.72 2.46 14.9 256.8 70.0 369.6 24.9 4.53 5.06 63.0
1956 8.25 3.78 3.30 3.58 3.88 34.2 711.8 445.2 192.5 1,136 40.6 97.6 224.3
1957 10.6 87.5 9.87 7.42 5.51 158.8 263.4 108.7 233.5 725.1 116.7 524.6 188.1
1958 153.0 77.0 13.8 8.48 2.12 2.16 47.7 14.8 6.74 98.7 4.77 9.68 36.9
1959 1.74 1.12 0.555 0.265 0.218 26.3 372.7 74.4 42.6 11.7 2.31 6.24 44.7
1960 22.4 11.3 4.30 4.78 4.79 4.95 534.2 55.2 53.5 13.1 3.86 1.33 58.8
1961 2.77 2.03 1.67 1.44 13.5 26.7 23.1 14.0 2.74 4.50 2.65 0.757 7.96
1962 2.54 1.36 4.43 3.63 3.21 30.3 369.6 655.4 1,031 109.5 77.3 11.8 191.4
1963 7.15 9.85 3.40 1.32 1.01 28.9 287.2 23.9 20.8 4.50 3.43 3.17 32.6
1964 2.59 1.21 0.745 0.600 0.600 0.765 196.3 118.8 742.9 40.2 7.09 6.72 92.2
1965 4.92 6.05 4.77 4.65 4.53 4.52 907.0 403.9 188.4 57.8 6.00 34.3 135.0
1966 99.4 16.0 13.8 10.8 8.91 11.7 1,977 913.2 250.3 282.9 124.9 41.6 312.2
1967 10.2 3.23 3.28 1.71 1.16 22.7 1,157 664.5 110.0 4.38 5.70 2.84 165.2
1968 2.07 2.79 2.26 1.55 1.35 125.3 69.0 5.66 502.8 707.0 193.9 239.7 154.7
1969 74.9 31.1 9.92 5.43 4.83 3.31 1,158 299.1 104.3 10.6 4.45 6.21 141.8
1970 3.71 2.45 2.07 1.97 1.67 3.06 751.4 1,338 1,336 131.1 12.3 6.55 299.1
1971 15.8 35.5 4.54 3.53 2.51 32.2 516.6 58.3 13.5 5.09 3.35 2.98 57.4
1972 2.06 11.0 4.55 2.55 2.79 65.6 444.6 42.9 31.0 4.51 3.68 4.18 51.1
1973 3.98 2.21 1.86 2.96 6.01 46.2 5.57 5.46 3.38 4.15 1.81 4.26 7.37
1974 7.94 4.78 2.59 1.86 1.70 1.61 882.1 634.7 253.2 12.3 30.4 8.30 153.2
1975 4.39 3.78 2.89 2.23 1.67 1.26 607.7 526.3 130.1 474.7 5.18 5.03 147.9
1976 4.15 3.55 3.28 1.99 1.68 59.0 207.7 10.4 7.81 4.16 3.02 3.38 25.7
1977 7.47 1.06 0.463 0.598 0.847 2.76 35.8 3.87 13.9 2.28 4.31 2.34 6.27
1978 0.780 0.420 2.06 2.52 1.85 2.04 778.3 103.1 27.9 102.3 5.51 1.33 85.1
1979 3.92 1.99 1.29 1.94 2.29 14.7 992.1 489.8 203.2 52.8 3.24 2.73 147.0
1980 5.60 0.993 2.55 2.14 1.83 3.32 216.9 4.14 1.43 3.12 1.31 0.960 20.1
1981 1.03 1.64 5.04 0.989 23.6 39.5 9.71 6.71 36.9 34.3 0.941 0.874 13.4
1982 6.13 -- -- -- -- -- -- -- -- -- -- -- --
1985 -- -- -- -- -- -- 280.9 211.8 482.8 385.6 360.3 279.5 --
1986 112.9 32.6 16.8 4.82 2.54 361.8 818.6 574.8 33.6 14.0 8.53 25.6 167.9
1987 5.59 0.418 0.131 0.116 0.120 200.7 288.3 35.2 9.43 7.52 1.29 0.656 45.8
1988 0.430 1.55 1.38 0.661 0.600 253.3 165.2 4.34 3.37 0.437 0.089 0.523 36.1
1989 1.57 0.503 0.549 0.338 0.177 1.49 407.2 35.9 68.0 17.3 2.99 1.10 44.3
1990 21.6 0.381 0.378 0.322 0.291 115.9 60.1 3.50 6.69 10.2 27.0 3.17 21.0
1991 0.400 0.484 0.413 0.346 2.90 10.2 0.539 0.984 13.4 527.4 27.4 217.2 67.4
1992 76.0 69.4 34.5 12.1 12.5 200.8 1,010 170.9 20.5 16.8 6.28 88.2 142.2
1993 34.6 0.527 0.443 0.472 0.520 5.93 201.1 46.2 107.8 340.4 1,349 431.6 211.9
1994 34.8 24.1 9.59 6.08 3.94 199.5 112.3 24.6 10.3 29.5 19.3 225.5 58.4
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