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Last update: Tuesday, 31-Aug-2004 10:28:16 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 173 1910 0.083 1977 52.4 39.1 0.75 5.50
November 142 1910 1.25 1977 49.9 38.6 0.78 5.24
December 132 1945 0.172 1977 42.0 37.9 0.90 4.41
January 125 1910 0 m 40.4 37.8 0.94 4.24
February 117 1945 0 m 39.2 34.7 0.89 4.11
March 186 1945 5.28 1962 68.5 49.9 0.73 7.20
April 320 1966 17.1 1977 156 71.7 0.46 16.4
May 310 1966 12.8 1977 161 76.4 0.47 16.9
June 356 1953 7.52 1977 137 83.0 0.61 14.4
July 266 1953 4.14 1977 88.1 61.0 0.69 9.25
August 179 1953 0.328 1976 62.0 47.0 0.76 6.51
September 189 1909 0.003 1976 55.4 43.2 0.78 5.82
Annual 147 1972 7.69 1977 79.4 34.4 0.43 100
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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 0.05 0 1.50 43.4 36.8 22.6 8.58 5.42 5.23 4.64 5.52 1.40 1.60
90 1.40 0.90 5.00 59.3 54.2 35.8 17.3 10.3 9.00 8.59 7.55 3.78 7.22
85 1.70 1.40 10.1 70.6 80.6 43.9 22.6 15.2 12.8 12.1 9.73 6.76 13.3
80 2.10 1.90 13.5 83.0 93.5 55.8 31.6 22.0 15.4 15.7 13.3 8.91 19.0
75 5.91 4.50 25.0 94.7 107 67.6 39.9 27.2 19.4 19.3 16.1 12.7 24.8
70 16.3 17.5 31.6 105 117 78.6 47.4 30.8 24.3 23.6 18.9 15.6 30.7
65 19.4 21.8 35.5 118 126 91.6 56.9 34.8 28.7 29.3 22.1 18.0 37.3
60 22.5 24.9 40.1 128 136 106 67.6 40.8 33.8 34.6 26.1 21.1 44.8
55 25.8 27.2 45.9 137 145 117 74.9 46.0 40.7 39.6 32.9 24.2 52.6
50 29.3 29.4 52.4 145 155 128 81.8 50.1 46.4 44.9 40.3 30.8 60.8
45 33.6 33.8 59.4 153 164 137 87.6 54.2 52.0 50.2 47.4 36.4 69.2
40 39.3 42.0 67.4 163 174 147 93.4 58.7 57.5 56.6 54.8 41.3 79.6
35 49.0 48.8 77.5 174 184 160 99.8 66.7 63.1 64.1 62.6 47.4 90.0
30 55.9 55.8 87.4 186 196 174 107 74.7 72.4 71.8 71.0 55.1 102
25 64.0 61.7 96.9 197 218 189 115 88.4 82.8 79.9 78.6 65.0 115
20 74.6 75.5 106 213 239 205 127 103 97.1 88.1 86.0 77.5 128
15 92.8 83.3 123 230 259 230 141 120 108 98.0 98.0 90.2 150
10 106 94.3 144 276 277 260 177 140 119 109 114 103 179
5 121 106 181 328 303 312 226 166 140 126 129 124 238
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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 84.8 63.6 55.5 38.2 28.5
0.95 1.05 123 98.3 89.5 72.2 60.4
0.90 1.11 149 123 113 96.9 84.6
0.80 1.25 190 159 148 133 120
0.50 2 300 253 235 218 201
0.20 5 475 388 351 311 279
0.10 10 606 479 422 357 311
0.04 25 785 593 504 400 337
0.02 50 928 677 561 425 349
0.01 100 1,080 760 614 443 357
0.005 200 1,240 842 663 458 363
0.002 500 1,470 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 0.124 1.35 2.14
0.10 10 0 0 0 0 0 0.612 0.778 2.87 4.68
0.20 5 1.86 2.09 2.50 2.62 2.94 3.45 3.60 6.49 10.5
0.50 2 11.4 12.2 13.8 14.4 15.6 18.0 22.7 22.9 33.0
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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 0 0 0 0 0 1.00 8.15
0.10 10 0.059 0.059 0.063 0.081 0.141 1.37 2.69 13.0
0.20 5 3.02 3.07 3.20 3.58 6.57 6.85 7.53 22.0
0.50 2 18.8 19.1 19.7 21.0 31.9 32.5 33.8 51.6
June-July-August September-October-November
_____________________________ __________________________
0.05 20 2.34 4.07 5.56 16.80 1.32 2.39 2.90 4.30
0.10 10 5.33 7.78 9.84 111.0 2.88 4.56 5.37 7.42
0.20 5 11.3 14.3 17.0 20.5 6.12 8.58 9.81 12.7
0.50 2 33.1 36.1 39.5 57.7 19.6 23.4 25.6 30.2
___________________________________________________________________________________________
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)
_____________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
1910 October 11 -- 303 1961 April 24 2.33 135
1911 May 8 -- 124 1962 May 24 3.45 365
1912 May 28 -- 230 1963 March 29 4.11 230
1943 March 29 5.53 756 1964 May 8 4.47 274
1944 June 5 -- 212 1965 April 9 6.34 551
1945 March 17 -- 330 1966 April 1 4.73 560
1946 May 16 -- 212 1967 March 30 6.99 655
1947 June 7 -- 218 1968 May 15 4.05 194
1948 -- -- -- 1969 April 12 5.30 710
1949 April 3 -- 245 1970 June 20 4.38 350
1950 May 6 -- 296 1971 July 3 4.16 251
1951 April 7 -- 177 1972 May 30 4.60 420
1952 April 14 -- 388 1973 March 25 3.97 163
1953 June 15 4.85 680 1974 April 12 6.08 725
1954 July 2 -- 242 1975 April 19 6.72 585
1955 April 4 -- 250 1976 March 26 5.11 186
1956 April 13 -- 315 1977 May 14 3.70 129
1957 April 20 -- 216 1978 April 6 5.41 635
1958 July 7 -- 125 1979 April 18 5.08 610
1959 May 31 -- 164 1980 April 5 5.86 495
1960 April 27 -- 206
Annual peak discharge, from highest to lowest, and corresponding gage height
1943 March 29 5.53 756 1955 April 4 -- 250
1974 April 12 6.08 725 1949 April 3 -- 245
1969 April 12 5.30 710 1954 July 2 -- 242
1953 June 15 4.85 680 1912 May 28 -- 230
1967 March 30 6.99 655 1963 March 29 4.11 230
1978 April 6 5.41 635 1947 June 7 -- 218
1979 April 18 5.08 610 1957 April 20 -- 216
1975 April 19 6.72 585 1944 June 5 -- 212
1966 April 1 4.73 560 1946 May 16 -- 212
1965 April 9 6.34 551 1960 April 27 -- 206
1980 April 5 5.86 495 1968 May 15 4.05 194
1972 May 30 4.60 420 1976 March 26 5.11 186
1952 April 14 -- 388 1951 April 7 -- 177
1962 May 24 3.45 365 1959 May 31 -- 164
1970 June 20 4.38 350 1973 March 25 3.97 163
1945 March 17 -- 330 1961 April 24 2.33 135
1956 April 13 -- 315 1977 May 14 3.70 129
1910 October 11 -- 303 1958 July 7 -- 125
1950 May 6 -- 296 1911 May 8 -- 124
1964 May 8 4.47 274 1948 -- -- --
1971 July 3 4.16 251
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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
__________________________________________________________________________________________________________________________________
1909 -- -- -- -- -- -- -- -- -- 96.0 151.2 188.8 --
1910 172.9 141.5 125.0 125.0 80.0 180.0 188.3 148.5 70.8 18.5 9.15 5.58 105.7
1911 8.20 12.7 3.00 2.00 2.00 10.0 38.3 33.4 34.5 11.4 15.3 18.8 15.8
1912 35.7 22.4 10.0 2.00 2.00 8.00 71.3 181.7 98.9 33.1 42.0 36.2 45.4
1913 46.5 42.6 20.0 -- -- -- -- -- -- -- -- -- --
1942 -- -- -- -- -- -- -- -- -- 23.5 10.8 19.4 --
1943 22.0 18.1 19.1 19.5 17.6 140.8 198.5 150.9 162.2 84.6 53.1 50.2 78.2
1944 58.1 22.9 14.7 20.4 13.4 20.6 72.8 111.2 145.7 88.5 64.6 100.9 61.1
1945 122.3 125.3 132.3 117.4 116.8 186.2 172.1 159.9 124.5 29.6 19.7 9.80 109.6
1946 8.11 6.67 1.63 0 0 51.0 97.2 127.7 53.7 55.0 43.6 44.3 41.0
1947 79.4 92.3 91.1 93.2 61.1 95.3 191.5 188.4 159.8 65.3 29.5 19.0 97.3
1948 38.9 27.6 12.1 3.82 1.67 20.0 128.9 118.3 50.7 29.6 26.8 12.1 39.2
1949 4.64 5.46 4.03 0.910 0 6.37 81.6 35.8 21.2 40.6 23.6 7.43 19.4
1950 8.48 7.73 1.60 0 0 18.1 139.9 248.6 194.9 118.9 49.4 27.9 68.2
1951 21.6 23.9 36.0 33.6 32.1 36.0 137.9 113.3 102.9 68.7 48.5 61.2 59.6
1952 68.3 89.6 104.9 117.4 98.9 99.0 231.4 150.8 85.1 97.2 106.2 105.5 112.8
1953 76.7 57.0 38.2 29.6 25.9 54.4 170.7 199.9 355.9 265.5 179.0 129.6 132.2
1954 110.7 116.3 94.1 57.5 64.3 125.7 161.1 167.3 150.6 107.4 56.5 47.0 105.1
1955 38.4 30.3 20.6 19.8 22.9 32.6 107.4 86.9 85.5 122.9 115.8 105.4 65.9
1956 108.0 64.5 28.8 25.5 27.9 35.4 207.4 195.1 127.9 52.3 47.5 20.3 78.4
1957 10.8 12.4 8.39 6.03 3.83 43.0 94.1 135.6 112.3 87.4 88.5 107.9 59.4
1958 87.2 76.5 56.6 49.4 41.5 55.0 69.2 52.8 52.3 107.9 65.2 70.3 65.5
1959 40.5 50.5 39.1 28.3 27.3 78.9 78.9 104.3 129.0 87.5 56.9 58.8 65.2
1960 66.1 58.6 55.0 65.1 58.0 60.6 149.2 174.5 125.1 71.8 40.9 46.8 80.9
1961 27.3 13.9 7.06 17.2 21.4 45.4 76.0 98.4 51.0 31.0 15.6 16.2 35.1
1962 13.3 14.2 8.03 2.80 0.971 5.28 138.4 205.4 291.1 236.2 156.4 131.8 100.7
1963 110.4 87.7 57.9 39.8 29.0 73.0 145.1 115.5 155.9 75.4 55.5 56.2 83.6
1964 34.3 23.9 16.3 17.7 25.7 37.0 180.7 224.2 139.9 54.9 33.5 32.7 68.3
1965 25.8 26.2 24.3 28.2 36.0 48.1 287.1 248.6 268.0 145.9 87.1 85.6 109.2
1966 99.7 80.1 73.3 58.8 49.9 90.3 319.7 309.5 225.6 116.8 127.9 92.5 137.3
1967 77.8 73.6 62.4 61.6 58.8 128.4 269.8 276.0 269.3 126.6 52.9 28.0 123.9
1968 17.1 14.7 18.9 4.27 1.46 15.9 114.6 145.5 141.3 91.7 55.7 52.2 56.1
1969 47.8 41.4 34.5 50.7 91.7 112.7 316.4 292.2 173.8 94.5 53.6 22.2 110.8
1970 21.8 16.2 16.6 20.2 26.4 36.7 134.2 161.6 188.2 86.6 37.9 13.3 63.3
1971 14.0 16.5 15.8 16.6 24.4 63.1 139.0 59.0 63.1 117.8 38.6 52.8 51.8
1972 60.7 114.0 126.8 114.5 111.6 184.6 199.7 286.8 203.8 133.6 136.6 89.6 147.0
1973 54.5 48.8 42.8 46.7 50.3 109.0 119.5 87.5 46.2 26.3 23.6 52.9 59.0
1974 86.2 101.0 91.5 93.0 97.0 96.3 166.2 247.8 279.5 120.8 86.1 55.6 126.7
1975 43.4 47.8 30.6 30.3 41.7 61.8 206.0 269.7 233.0 239.1 164.9 138.6 125.9
1976 100.2 78.5 60.7 58.6 74.5 120.1 134.8 101.1 37.2 10.3 0.328 0.003 64.7
1977 0.083 1.25 0.172 0 0 18.7 17.1 12.8 7.52 4.14 5.27 25.2 7.69
1978 50.3 103.6 85.9 95.9 78.7 94.2 254.2 215.5 126.8 103.0 50.7 34.7 107.8
1979 12.5 6.51 6.51 1.94 4.58 21.5 237.1 247.1 211.7 190.5 128.4 94.5 97.2
1980 68.5 79.5 66.7 82.0 84.3 90.9 168.3 121.9 61.9 18.6 11.2 14.9 72.2
1981 -- -- -- -- -- -- -- -- -- -- -- -- --
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