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Last update: Tuesday, 31-Aug-2004 10:28:58 EDT
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Statistics of monthly and annual mean discharges
[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 51.1 1978 0.023 1977 13.9 13.7 0.98 2.09
November 76.7 1972 2.05 1977 14.2 13.1 0.92 2.12
December 23.5 1978 0.006 1961 4.95 4.90 0.99 0.74
January 13.1 1978 0 m 1.67 2.59 1.55 0.25
February 14.0 1987 0 m 1.62 2.63 1.63 0.24
March 581 1966 0 m 104 137 1.32 15.6
April 928 1969 27.9 1973 254 233 0.92 38.0
May 580 1962 8.28 1980 76.7 98.5 1.28 11.5
June 1,070 1962 1.30 1976 93.1 184 1.97 14.0
July 1,110 1975 0 1988 77.4 182 2.35 11.6
August 152 1993 0 1976 12.1 25.3 2.09 1.81
September 174 1986 0 1976 13.9 29.3 2.11 2.09
Annual 198 1962 12.2 1977 55.8 42.5 0.76 100
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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 0 0 23.6 5.47 1.40 0.05 0 0 0.49 2.10 0 0
90 0 0 0 30.2 11.7 2.87 1.50 0 0.17 1.10 3.10 0 0
85 0 0 0 35.5 15.6 4.24 2.25 0.37 0.43 2.00 3.80 0.36 0.27
80 0 0 0 42.4 18.6 6.07 2.79 0.71 0.78 2.60 4.98 0.69 0.93
75 0 0 0.18 49.9 21.6 7.71 3.35 0.98 1.40 3.54 5.74 0.87 1.40
70 0 0 0.52 58.0 24.8 8.97 4.00 1.40 2.00 4.27 6.87 1.30 2.51
65 0.10 0 1.10 66.0 28.0 11.3 5.55 1.90 2.00 4.97 7.32 1.70 3.29
60 0.18 0 2.56 75.9 32.3 13.5 6.64 2.60 2.70 6.02 7.77 2.10 3.88
55 0.26 0.02 3.53 86.5 36.5 15.9 8.23 3.12 2.70 6.49 8.78 2.60 5.41
50 0.46 0.08 4.95 98.6 40.8 18.8 11.1 3.63 4.07 6.96 9.30 3.30 6.50
45 0.55 0.27 7.82 112 45.2 22.9 14.1 4.09 4.60 8.87 11.4 3.30 8.56
40 0.96 0.88 16.7 128 49.5 27.7 17.8 4.55 5.43 10.0 12.6 4.46 11.4
35 1.40 1.10 31.2 154 55.2 34.2 22.8 6.04 6.84 12.0 13.7 5.14 15.4
30 1.70 1.80 49.4 187 62.6 42.3 30.1 7.25 7.98 14.0 14.8 5.64 20.9
25 2.00 2.30 74.6 231 70.0 54.3 40.9 8.56 9.88 18.2 17.1 6.45 29.1
20 2.40 2.90 104 318 85.5 73.7 58.5 11.9 12.5 22.4 20.0 7.10 41.0
15 4.20 3.96 157 464 107 103 84.2 16.8 17.1 28.2 24.7 8.97 59.8
10 5.21 5.07 251 654 142 174 126 24.7 26.5 36.3 31.0 11.7 97.4
5 6.44 6.27 480 1,010 226 396 315 46.3 62.5 52.1 42.0 17.3 214
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Probability of annual high discharges
[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 83.7 66.0 54.8 37.9 30.1
0.95 1.05 185 144 117 81.8 61.4
0.90 1.11 279 217 175 121 88.7
0.80 1.25 452 354 280 194 137
0.50 2 1,100 882 673 454 302
0.20 5 2,540 2,140 1,570 1,010 637
0.10 10 3,880 3,370 2,410 1,510 924
0.04 25 5,990 5,430 3,770 2,280 1,350
0.02 50 7,870 7,350 5,010 2,950 1,720
0.01 100 10,000 9,620 6,450 3,700 2,120
0.005 200 12,400 12,300 8,100 4,540 2,570
0.002 500 16,100 ng ng ng ng
__________________________________________________________________________________________________
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Probability of annual low discharges
____________________________________________________________________________________
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 0.100 1.07
0.10 10 0 0 0 0 0 0 0 0.241 1.49
0.20 5 0 0 0 0 0 0 0.038 0.609 2.23
0.50 2 0 0 0 0 0 0.188 0.721 2.45 4.80
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Probability of seasonal low discharges
_____________________________________________________________________________________________
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 0.308
0.20 5 0 0 0 0 0 0 0 2.34
0.50 2 0.068 0.068 0.070 0.100 0.312 0.550 1.90 20.9
June-July-August September-October-November
___________________________ _____________________________
0.05 20 0 0 0 0 0 0 0 0.297
0.10 10 0 0 0 0.073 0.032 0.058 0.190 0.610
0.20 5 0.151 0.264 0.529 0.647 0.201 0.357 0.679 1.24
0.50 2 0.951 1.39 1.75 4.21 0.966 1.64 2.26 3.87
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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
1945 March 18 14.69 1,480 1970 April 9 10.70 432
1946 March 18 14.34 955 1971 September 6 9.32 326
1947 April 12 13.82 1,230 1972 March 17 14.39 2,140
1948 April 4 -- 730 1973 March 16 7.33 132
1949 April 5 9.08 324 1974 April 13 12.76 1,330
1950 April 1 -- 1,460 1975 July 2 19.90 8,500
1951 April 6 13.39 1,640 1976 March 26 11.10 369
1952 April 8 15.37 3,400 1977 June 3 9.05 234
1953 May 31 15.38 3,410 1978 March 31 15.70 3,440
1954 March 24 10.90 390 1979 April 14 15.33 2,800
1955 April 2 12.28 862 1980 April 2 12.99 1,260
1956 April 5 15.18 2,410 1981 May 23 11.33 500
1957 April 21 12.53 982 1982 April 1 13.12 1,350
1958 July 7 14.60 1,520 1983 July 5 14.03 1,500
1959 June 20 11.18 572 1984 March 26 13.94 2,090
1960 April 27 12.34 1,020 1985 June 2 13.69 1,660
1961 May 18 9.09 248 1986 March 25 14.86 2,550
1962 June 9 17.04 6,340 1987 March 26 11.34 689
1963 June 4 13.20 1,420 1988 March 9 10.64 175
1964 April 17 11.72 796 1989 April 4 16.30 3,800
1965 April 11 15.96 4,130 1990 April 1 9.22 178
1966 March 15 16.78 3,310 1991 May 4 10.30 285
1967 March 27 12.95 1,240 1992 June 20 10.94 414
1968 April 10 8.25 230 1993 March 30 14.57 1,910
1969 April 10 18.12 6,410 1994 March 24 12.79 730
Annual peak discharge, from highest to lowest, and corresponding gage height
1975 July 2 19.90 8,500 1983 July 5 14.03 1,500
1969 April 10 18.12 6,410 1945 March 18 14.69 1,480
1962 June 9 17.04 6,340 1950 April 1 -- 1,460
1965 April 11 15.96 4,130 1963 June 4 13.20 1,420
1989 April 4 16.30 3,800 1982 April 1 13.12 1,350
1978 March 31 15.70 3,440 1974 April 13 12.76 1,330
1953 May 31 15.38 3,410 1980 April 2 12.99 1,260
1952 April 8 15.37 3,400 1967 March 27 12.95 1,240
1966 March 15 16.78 3,310 1947 April 12 13.82 1,230
1979 April 14 15.33 2,800 1960 April 27 12.34 1,020
1986 March 25 14.86 2,550 1957 April 21 12.53 982
1956 April 5 15.18 2,410 1946 March 18 14.34 955
1972 March 17 14.39 2,140 1955 April 2 12.28 862
1984 March 26 13.94 2,090 1964 April 17 11.72 796
1993 March 30 14.57 1,910 1948 April 4 -- 730
1985 June 2 13.69 1,660 1994 March 24 12.79 730
1951 April 6 13.39 1,640 1987 March 26 11.34 689
1958 July 7 14.60 1,520 1959 June 20 11.18 572
1981 May 23 11.33 500 1991 May 4 10.30 285
1970 April 9 10.70 432 1961 May 18 9.09 248
1992 June 20 10.94 414 1977 June 3 9.05 234
1954 March 24 10.90 390 1968 April 10 8.25 230
1976 March 26 11.10 369 1990 April 1 9.22 178
1971 September 6 9.32 326 1988 March 9 10.64 175
1949 April 5 9.08 324 1973 March 16 7.33 132
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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
__________________________________________________________________________________________________________________________________
1945 -- -- -- -- -- -- 190.2 50.1 41.0 3.77 3.08 4.92 --
1946 7.84 5.29 0.265 0 0 201.9 51.1 18.9 15.8 37.6 3.88 2.72 29.1
1947 8.91 9.87 2.62 0.729 2.39 105.1 393.4 50.8 63.6 8.29 0.529 2.19 53.8
1948 6.13 2.93 0.016 0 0 56.6 263.8 22.2 8.89 4.38 1.88 0.490 30.4
1949 0.923 5.31 1.59 0 0 0.271 90.2 23.0 5.64 15.9 8.57 0.223 12.6
1950 3.32 4.53 1.99 0 0 188.4 618.5 286.2 17.5 4.81 1.71 0.927 94.0
1951 3.84 2.89 0.613 0 0 9 383.1 32.3 60.2 15.7 3.61 8.31 42.1
1952 20.5 10.9 6.66 1.79 1.00 1.51 595.3 14.3 3.38 179.8 11.1 8.15 70.7
1953 3.97 7.82 2.02 0.558 0 86.9 90.6 241.1 544.2 21.4 17.6 4.16 84.9
1954 1.24 3.90 1.75 0.568 0.889 86.6 91.1 50.7 54.5 10.0 4.42 6.01 26.0
1955 19.4 10.5 3.40 0.626 0 4.84 164.3 25.2 42.4 213.0 9.86 1.49 41.4
1956 2.67 2.64 0.135 0 0 0.177 411.5 54.3 21.1 3.12 2.84 1.56 41.2
1957 4.10 5.49 1.73 0.235 0 75.1 157.8 49.4 48.4 35.6 11.8 91.5 40.0
1958 34.1 40.1 6.93 2.21 3.65 19.6 41.7 27.4 45.6 419.4 12.0 15.4 56.3
1959 10.8 28.4 2.09 0 0 54.6 44.7 55.5 179.5 90.6 14.5 9.01 40.9
1960 13.7 7.53 4.18 3.24 2.86 27.4 386.6 68.5 38.6 39.0 7.75 8.73 50.3
1961 4.58 5.58 0.006 0 1.07 74.9 65.2 78.2 5.55 1.97 2.10 5.22 20.5
1962 8.95 6.33 2.89 0.100 0 0 353.7 580.1 1,068 256.9 78.8 19.4 197.8
1963 20.8 31.2 9.11 0.013 0 41.4 88.9 98.9 293.8 5.36 9.61 22.0 51.6
1964 6.29 7.49 2.55 0 0 3.94 347.1 79.0 30.0 5.13 5.09 7.10 40.8
1965 6.24 10.3 0.135 0 0 0.068 816.9 62.4 99.1 25.8 14.4 18.2 86.9
1966 50.9 17.3 5.04 0.729 0 581.2 163.1 100.0 31.1 33.3 71.6 8.41 89.7
1967 18.8 13.8 3.83 0.435 0.143 140.1 280.8 80.3 157.4 7.30 1.56 1.64 58.7
1968 11.7 16.0 3.81 0.132 0 25.7 66.1 47.7 29.8 12.4 4.27 11.1 19.1
1969 33.6 30.6 7.91 0.535 0 0 927.8 42.7 10.0 38.1 8.36 3.14 91.0
1970 9.16 12.9 5.34 1.83 1.86 8.76 162.7 61.6 62.3 8.23 1.23 2.12 28.0
1971 6.46 9.31 3.34 0.235 0 58.6 72.5 23.5 17.2 102.8 4.16 41.6 28.5
1972 36.3 76.7 14.4 2.99 1.19 314.1 158.5 175.5 21.4 5.13 7.43 4.31 68.5
1973 13.8 15.1 4.68 4.88 4.92 37.1 27.9 20.4 4.19 3.49 3.37 11.9 12.7
1974 26.0 13.2 9.74 0.733 0.050 5.46 255.1 84.0 22.8 4.32 6.79 1.35 35.7
1975 6.73 15.2 3.34 0.329 0.029 0.623 395.6 71.2 515.7 1,112 6.44 1.66 178.3
1976 8.82 14.8 5.35 0.835 0.372 73.1 80.3 10.2 1.30 1.22 0 0 16.4
1977 0.023 2.05 0.772 0.190 0.094 28.7 37.9 8.91 35.8 15.2 0.426 16.5 12.2
1978 51.1 32.8 23.5 13.1 5.29 450.8 679.0 29.9 8.69 7.67 1.06 2.89 108.9
1979 2.94 4.74 2.03 0.582 0.236 4.76 677.0 78.5 23.3 55.2 10.8 2.67 71.3
1980 4.10 18.2 5.04 1.64 2.11 38.9 275.5 8.28 7.73 0.217 2.17 5.60 30.4
1982 -- -- -- -- -- 211.1 248.3 45.8 6.00 7.72 2.47 -- --
1983 -- -- -- -- -- 114.4 43.7 32.0 8.03 312.4 12.3 -- --
1984 7.78 16.1 -- -- -- 441.5 156.8 27.3 129.5 5.76 0.014 0.161 --
1985 33.6 -- -- -- -- 148.3 75.1 146.2 267.4 32.8 26.7 72.8 --
1986 36.4 14.4 7.89 5.07 2.95 439.0 601.1 324.7 231.9 70.0 19.0 173.5 160.8
1987 45.1 27.8 20.8 7.84 14.0 213.4 86.3 44.3 8.11 5.45 6.92 8.62 41.0
1988 6.79 13.0 8.42 0 1.07 85.7 57.7 29.0 6.02 0 0.108 0.650 17.4
1989 3.00 7.40 3.64 2.18 2.88 10.9 694.8 25.5 9.98 1.64 0.032 12.6 63.8
1990 8.53 8.63 2.31 4.14 4.51 39.9 60.1 42.1 34.4 6.57 0.398 0.316 17.7
1991 5.71 9.50 5.03 1.38 4.00 31.2 47.4 85.1 34.7 65.7 3.59 3.78 24.9
1992 11.8 10.6 6.30 4.78 5.50 83.7 46.4 22.6 96.4 26.0 8.15 9.21 27.6
1993 2.54 20.3 8.42 3.00 2.22 155.1 215.8 50.7 81.6 425.4 152.2 11.3 94.9
1994 10.5 7.98 6.40 5.94 5.80 210.0 198.2 72.0 13.6 30.1 5.93 8.65 48.2
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