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Last update: Wednesday, 23-Feb-2005 09:46:02 EST
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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 25.7 1983 0 1950 3.97 5.98 1.50 1.32
November 16.0 1985 0.015 1989 3.59 3.34 0.93 1.19
December 12.2 1983 0.010 1990 4.21 3.18 0.75 1.40
January 31.2 1974 0 1990 5.39 5.06 0.94 1.79
February 28.6 1981 0 1990 5.75 5.49 0.95 1.91
March 234 1966 0.059 1991 31.8 48.4 1.52 10.6
April 749 1950 0.608 1977 144 174 1.20 47.9
May 706 1950 0.727 1977 48.1 114 2.37 16.0
June 182 1964 0.776 1989 19.5 30.2 1.54 6.49
July 500 1993 0.028 1990 21.6 75.1 3.48 7.18
August 194 1993 0 1990 7.34 28.6 3.90 2.44
September 36.2 1951 0 1990 5.28 8.17 1.55 1.76
Annual 124.5 1950 0.516 1990 25.0 24.0 0.96 100
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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 0.04 0.08 0.07 0.40 0.50 0.56 0.10 0.04 0 0 0.07 0.03 0.05
90 0.48 0.40 0.26 1.10 0.96 1.00 0.44 0.07 0.04 0.05 0.13 0.11 0.16
85 0.48 0.50 0.50 2.20 1.30 1.40 0.64 0.19 0.09 0.12 0.21 0.48 0.34
80 1.00 0.50 0.96 3.52 1.80 1.80 0.94 0.37 0.17 0.21 0.34 0.77 0.76
75 1.40 1.00 1.30 4.69 3.48 2.50 0.94 0.51 0.51 0.37 0.43 1.30 0.76
70 1.40 1.30 1.30 5.25 4.38 3.31 1.40 0.51 0.67 0.49 0.68 1.60 1.10
65 1.80 1.60 1.80 7.91 5.55 3.86 1.40 0.71 0.67 0.65 0.86 1.60 1.10
60 2.30 2.00 3.20 12.0 7.36 4.66 2.00 0.99 0.89 0.65 1.10 2.00 1.70
55 3.00 2.50 4.14 16.4 8.43 5.41 2.00 0.99 0.89 0.86 1.40 2.00 2.64
50 4.13 3.20 5.08 22.8 10.8 6.81 3.20 1.40 1.20 1.10 1.40 2.60 3.31
45 4.42 4.27 5.51 29.9 13.3 7.74 3.71 1.40 1.60 1.10 1.70 3.30 3.94
40 4.70 4.86 7.49 39.2 15.7 8.91 4.84 1.90 1.60 1.50 2.20 4.42 4.41
35 5.25 5.43 10.3 54.1 18.2 10.0 5.86 1.90 2.10 1.50 3.50 4.92 6.02
30 5.72 5.99 13.5 72.7 22.1 13.7 6.97 2.92 2.70 2.00 4.53 5.52 7.05
25 6.88 7.22 17.8 105 27.0 16.6 8.12 3.47 2.70 2.60 4.99 6.00 9.98
20 7.78 10.0 27.6 142 34.1 19.6 11.7 4.21 4.53 4.63 5.71 6.98 13.4
15 8.68 11.7 40.9 209 46.8 25.1 15.6 5.81 5.57 6.35 6.56 7.47 17.5
10 12.4 13.6 63.1 332 76.3 36.0 23.5 7.56 11.5 10.4 11.5 10.1 29.9
5 16.5 17.6 166 713 164 63.8 52.8 15.8 24.1 16.7 13.8 12.9 78.1
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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 5.60 2.35 2.08 1.84 1.56
0.95 1.05 27.3 13.6 11.0 8.58 6.43
0.90 1.11 59.1 31.8 24.5 18.1 12.9
0.80 1.25 141 81.5 60.0 41.9 28.2
0.50 2 614 388 267 171 108
0.20 5 2,110 1,370 903 544 337
0.10 10 3,670 2,380 1,540 910 568
0.04 25 6,220 3,970 2,540 1,480 936
0.02 50 8,470 5,300 3,380 1,950 1,260
0.01 100 10,900 6,700 4,270 2,460 1,610
0.005 200 13,600 8,150 5,180 2,980 1,990
0.002 500 17,300 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 0 0 0.003 0.005 10.008 0.011 0.041 0.167
0.10 10 0 0 0.006 0.026 0.044 0.076 0.150 0.178 0.425
0.20 5 0.033 0.037 0.054 0.075 0.129 0.253 0.448 0.598 1.06
0.50 2 0.148 0.174 0.250 0.312 0.525 1.04 1.59 2.27 3.29
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1Graphical interpretation.
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Probability of occurrence of seasonal low discharges
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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 0.005 0.029 0.031 0.052 0.035 0.044 0.072 0.160
0.10 10 0.055 0.085 0.095 0.170 0.084 0.124 0.188 0.396
0.20 5 0.177 0.235 0.270 0.493 0.208 0.337 0.481 1.07
0.50 2 0.874 1.06 1.23 1.99 0.910 1.62 2.14 5.26
June-July-August September-October-November
____________________________ _____________________________
0.05 20 0 0.012 0.024 0.078 0 0 0.004 0.006
0.10 10 0.030 0.071 0.113 0.277 0 0.006 0.034 0.064
0.20 5 0.094 0.182 0.267 0.565 0.049 0.067 0.102 0.191
0.50 2 0.391 0.700 0.928 1.64 0.256 0.374 0.462 0.802
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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
1950 April 24 37.52 13,000 1973 March 24 23.68 101
1951 April 4 28.42 900 1974 May 20 29.12 2,610
1952 September 10 24.75 106 1975 July 1 27.19 1,300
1953 August 28 23.64 17.0 1976 April 2 27.08 1,240
1954 June 14 25.73 386 1977 September 17 23.53 12.0
1955 April 1 28.50 1,600 1978 April 7 28.56 2,170
1956 April 25 29.16 2,000 1979 April 20 31.49 5,380
1957 March 23 25.54 324 1980 May 28 24.67 211
1958 March 21 23.98 58.0 1981 April 2 25.49 429
1959 April 3 25.48 368 1982 July 24 27.40 1,290
1960 April 12 29.43 2,580 1983 March 6 27.10 1,200
1961 April 26 23.91 86.0 1984 March 25 24.83 244
1962 April 18 27.99 1,780 1985 March 19 25.71 473
1963 June 25 24.90 316 1986 March 23 25.90 620
1964 June 19 28.71 2,300 1987 April 6 28.36 2,000
1965 April 11 30.68 3,100 1988 April 3 23.39 29.0
1966 April 1 27.81 1,670 1989 April 24 23.45 61.0
1967 May 7 28.37 1,950 1990 April 5 23.46 24.0
1968 March 26 24.69 233 1991 July 6 23.56 32.0
1969 April 11 29.45 2,900 1992 March 29 25.62 933
1970 April 8 26.63 980 1993 July 28 29.53 4,210
1971 April 9 28.99 2,850 1994 March 22 25.62 500
1972 March 17 27.20 1,210
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 24 37.52 13,000 1970 April 8 26.63 980
1979 April 20 31.49 5,380 1992 March 29 25.62 933
1993 July 28 29.53 4,210 1951 April 4 28.42 900
1965 April 11 30.68 3,100 1986 March 23 25.90 620
1969 April 11 29.45 2,900 1994 March 22 25.62 500
1971 April 9 28.99 2,850 1985 March 19 25.71 473
1974 May 20 29.12 2,610 1981 April 2 25.49 429
1960 April 12 29.43 2,580 1954 June 14 25.73 386
1964 June 19 28.71 2,300 1959 April 3 25.48 368
1978 April 7 28.56 2,170 1957 March 23 25.54 324
1956 April 25 29.16 2,000 1963 June 25 24.90 316
1987 April 6 28.36 2,000 1984 March 25 24.83 244
1967 May 7 28.37 1,950 1968 March 26 24.69 233
1962 April 18 27.99 1,780 1980 May 28 24.67 211
1966 April 1 27.81 1,670 1952 September 10 24.75 106
1955 April 1 28.50 1,600 1973 March 24 23.68 101
1975 July 1 27.19 1,300 1961 April 26 23.91 86.0
1982 July 24 27.40 1,290 1989 April 24 23.45 61.0
1976 April 2 27.08 1,240 1958 March 21 23.98 58.0
1972 March 17 27.20 1,210 1991 July 6 23.56 32.0
1983 March 6 27.10 1,200 1988 April 3 23.39 29.0
1990 April 5 23.46 24.0 1977 September 17 23.53 12.0
1953 August 28 23.64 17.0
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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]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
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1950 0 0.500 0.445 0.500 0.589 2.21 749.3 705.8 21.3 6.80 2.71 0.793 124.5
1951 1.37 2.86 1.86 1.60 1.60 8.13 93.7 9.76 3.42 0.961 1.00 36.2 13.4
1952 20.4 2.01 2.00 2.60 1.47 0.297 1.30 5.96 1.05 1.79 1.24 23.5 5.30
1953 0.677 2.36 4.07 4.58 4.41 2.96 1.73 0.852 2.42 0.706 1.63 3.27 2.46
1954 1.78 1.53 1.75 3.78 2.27 2.79 2.46 3.52 70.8 9.67 5.36 6.03 9.25
1955 5.90 3.46 2.00 2.04 2.45 8.58 159.2 19.6 18.6 6.01 2.31 16.5 20.4
1956 0.729 0.737 1.86 1.25 1.74 28.8 341.3 137.3 68.5 10.8 1.79 1.74 49.4
1957 4.44 5.43 1.47 1.20 12.5 29.0 15.5 9.85 4.30 1.43 4.84 20.2 9.13
1958 1.87 1.37 5.52 3.09 3.56 3.55 2.94 1.18 2.21 1.71 2.16 1.51 2.55
1959 4.49 0.657 10.5 1.48 0.679 1.02 84.2 11.7 3.30 6.12 1.28 0.973 10.5
1960 1.08 2.36 0.542 5.19 3.77 7.68 391.8 16.2 7.75 2.02 1.71 6.33 36.7
1961 0.910 0.907 0.448 9.17 0.457 0.252 4.77 1.46 1.19 3.64 1.26 5.08 2.47
1962 0.929 5.12 2.33 2.19 3.21 25.9 224.9 37.4 51.9 4.76 1.30 1.31 29.9
1963 3.14 1.68 0.990 8.93 9.85 6.37 5.48 2.93 47.1 6.97 5.55 1.83 8.33
1964 4.16 0.553 1.25 10.6 2.09 1.64 70.8 18.7 181.5 30.4 1.61 1.08 26.8
1965 0.823 0.500 1.34 5.54 9.80 22.1 283.0 60.0 21.4 11.6 8.10 22.3 36.9
1966 22.0 5.02 4.19 4.82 10.4 234.1 200.7 154.7 22.7 57.1 10.0 2.18 61.1
1967 2.33 1.43 7.95 5.43 7.94 83.4 215.1 182.5 7.19 2.22 2.73 2.88 43.6
1968 2.41 2.04 5.80 9.11 2.98 28.1 12.8 14.6 16.9 5.01 0.058 0.046 8.35
1969 3.23 2.26 4.95 11.5 13.1 13.0 355.4 16.4 11.9 3.31 4.25 3.43 36.5
1970 2.41 2.55 7.99 7.45 6.03 4.93 170.8 43.9 8.44 4.03 0.225 1.53 21.6
1971 2.36 3.79 5.72 5.68 5.88 19.4 335.0 13.7 16.8 22.7 1.42 0.913 35.8
1972 4.96 3.75 2.61 7.26 13.6 124.0 118.1 12.0 2.22 1.84 2.34 5.04 24.8
1973 0.557 4.13 6.85 2.52 12.8 23.2 6.15 5.24 3.50 1.70 2.12 1.42 5.82
1974 3.78 6.70 7.85 31.2 8.12 11.7 424.8 275.1 21.0 3.88 2.72 3.08 66.6
1975 2.08 7.94 9.61 5.47 3.72 4.65 86.4 42.4 5.98 57.6 1.44 2.38 19.2
1976 2.05 7.76 4.84 6.98 7.73 32.7 188.2 5.81 46.3 4.78 3.42 2.39 25.8
1977 1.03 6.05 8.43 5.42 5.51 5.64 0.608 0.727 1.65 1.73 1.02 3.51 3.43
1978 1.80 2.38 5.76 4.08 4.60 5.53 336.5 27.0 8.22 3.08 2.48 1.19 33.2
1979 1.31 8.78 4.82 3.48 3.11 5.01 620.0 96.5 11.8 19.4 5.69 4.51 64.8
1980 0.655 4.36 3.37 1.14 0.453 0.243 30.0 13.6 17.2 0.918 1.81 14.0 7.26
1981 9.93 11.8 10.0 2.30 28.6 55.5 39.9 10.4 40.4 20.0 2.22 2.56 19.4
1982 1.77 4.61 5.37 4.95 3.27 36.3 168.6 26.3 23.3 92.3 16.3 0.727 32.0
1983 25.7 8.16 12.2 11.5 12.0 76.0 115.1 20.2 26.2 5.26 1.71 0.949 26.2
1984 0.332 4.30 5.07 6.76 0.614 29.5 24.7 6.88 4.18 2.69 3.59 2.23 7.60
1985 10.4 16.0 2.61 2.86 2.37 73.6 19.1 8.34 9.09 3.36 17.6 3.13 14.2
1986 6.95 4.40 4.20 7.92 11.3 87.7 63.6 22.0 8.51 21.3 3.25 3.52 20.5
1987 0.817 0.740 5.94 6.52 6.67 20.9 315.6 12.8 7.61 6.40 2.33 0.948 31.9
1988 0.249 0.156 2.31 5.69 4.82 1.16 8.37 3.32 3.74 3.02 1.43 0.042 2.85
1989 0.011 0.015 0.033 0.077 0.156 10.2 10.4 3.71 0.776 0.040 0.017 0.016 2.14
1990 0.051 0.096 0.010 0 0 0.077 3.79 1.19 0.996 0.028 0 0 0.516
1991 0.021 0.077 0.060 0.042 0.050 0.059 0.951 3.91 3.35 9.18 0.278 0.184 1.53
1992 0.739 3.81 7.22 6.56 0.877 170.9 57.8 10.9 9.05 1.51 1.78 0.041 22.8
1993 0.043 0.037 0.032 1.76 11.5 20.2 25.1 41.3 18.7 500.1 193.6 26.2 70.9
1994 16.2 6.27 5.20 10.3 10.3 103.8 98.0 48.6 14.5 12.0 0.795 0.045 27.3
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