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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 168 1951 0.171 1949 28.3 51.1 1.80 2.30
November 25.9 1948 0.570 1954 11.3 9.88 0.87 0.92
December 12.0 1948 0.261 1954 5.04 4.45 0.88 0.41
January 8.40 1951 0.048 1953 2.24 2.98 1.33 0.18
February 6.61 1953 0 1949 2.13 2.41 1.13 0.17
March 299 1945 0.448 1955 49.7 104 2.08 4.04
April 900 1951 30.0 1953 436 304 0.70 35.4
May 2,520 1950 6.79 1952 378 732 1.93 30.7
June 612 1950 4.42 1952 198 230 1.16 16.1
July 354 1950 0.913 1952 80.2 127 1.58 6.52
August 108 1948 0.910 1952 21.4 32.5 1.52 1.74
September 85.1 1950 0 1952 17.7 29.8 1.68 1.44
Annual 377 1950 12.2 1953 103 107 1.05 100
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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 3.58 6.31 1.70 0.10 0 0 0 0.47 0.18 0
90 0.10 0 0 6.87 9.67 4.72 1.90 0.32 0.10 0.10 0.64 0.18 0.19
85 0.10 0 0.20 22.1 18.1 8.22 2.50 0.41 0.20 0.34 1.00 0.38 0.26
80 0.10 0 0.26 46.0 25.9 12.6 3.91 0.65 0.50 0.55 1.40 0.45 0.49
75 0.10 0.10 0.33 71.9 31.6 20.2 4.69 0.65 0.63 0.70 1.90 0.60 0.67
70 0.20 0.10 0.33 90.7 37.1 28.9 5.70 1.30 0.99 0.89 2.30 0.81 1.20
65 0.20 0.10 0.55 120 45.7 36.6 6.41 1.70 1.20 1.40 3.10 1.10 1.70
60 0.30 0.20 1.50 160 51.8 44.7 8.68 2.10 1.20 1.40 3.70 1.50 3.36
55 0.30 0.20 1.90 242 57.8 53.2 11.1 2.70 1.60 1.90 6.98 2.30 4.19
50 0.39 0.20 2.50 293 73.3 69.9 14.3 3.40 2.00 2.40 8.41 3.60 5.30
45 0.45 0.20 3.20 338 101 91.7 17.8 5.84 3.10 3.00 10.4 4.20 8.62
40 0.89 0.27 3.20 379 131 110 21.2 9.47 3.90 10.5 12.6 4.90 11.8
35 1.70 1.70 4.27 419 178 131 28.4 18.1 6.37 16.5 13.9 7.32 16.5
30 3.00 2.80 4.79 469 239 161 39.3 23.8 8.80 21.9 15.2 8.20 24.3
25 3.50 2.80 5.67 561 312 253 62.5 27.7 12.5 26.5 16.7 9.08 36.4
20 4.50 3.40 7.43 684 395 363 98.1 34.1 16.2 32.2 18.4 10.4 64.5
15 6.00 4.00 13.3 843 575 489 176 44.8 25.6 50.0 21.4 11.9 121
10 7.71 4.70 66.2 1,060 1,090 656 297 60.7 52.0 98.5 27.4 12.7 260
5 0 7.55 457 1,540 2,430 871 448 83.5 120 163 33.6 13.5 553
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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 92.1 72.5 63.1 44.2 33.1
0.95 1.05 194 167 147 107 77.2
0.90 1.11 282 253 225 166 119
0.80 1.25 434 406 364 278 198
0.50 2 932 919 846 686 500
0.20 5 1,840 1,870 1,770 1,540 1,180
0.10 10 2,560 2,610 2,510 2,280 1,820
0.04 25 3,540 3,600 3,540 3,350 2,810
0.02 50 4,310 4,370 4,350 4,240 3,700
0.01 100 5,110 5,150 5,180 5,200 4,700
0.005 200 5,940 5,940 6,030 6,210 5,820
0.002 500 7,060 ng ng ng ng
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Probability of occurrence of annual low discharges
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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)
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0.05 20 0 0 0 0 0 0 0.130 0.223 0.482
0.10 10 0 0 0 0 0 0 0.183 0.354 0.766
0.20 5 0 0 0 0 0 0.055 0.286 0.608 1.36
0.50 2 0.080 0.083 0.107 0.116 0.153 0.262 0.739 1.62 4.17
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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 0 0 0 0 0 0 0.273
0.10 10 0 0 0 0 0 0 0 0.426
0.20 5 0 0 0 0 0.066 0.072 0.075 0.789
0.50 2 0.160 0.180 0.188 0.229 0.989 1.10 1.27 3.31
June-July-August September-October-November
___________________________ ____________________________
0.05 20 0 0 0 0 0 0 0 0
0.10 10 0.094 0.094 0.118 0.469 0 0 0 0
0.20 5 0.314 0.351 0.477 1.22 0 0 0.046 0.265
0.50 2 1.32 1.74 2.44 4.48 0.461 0.650 0.863 1.77
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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
1945 March 28 -- 856 1951 April 17 15.64 1,350
1946 March 26 11.07 670 1952 April 14 10.24 392
1947 June 19 14.74 1,280 1953 June 8 5.42 146
1948 April 26 22.84 2,270 1954 June 19 10.80 553
1949 April 15 14.47 1,040 1955 June 13 12.97 902
1950 May 13 25.78 3,690
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 May 13 25.78 3,690 1945 March 28 -- 856
1948 April 26 22.84 2,270 1946 March 26 11.07 670
1951 April 17 15.64 1,350 1954 June 19 10.80 553
1947 June 19 14.74 1,280 1952 April 14 10.24 392
1949 April 15 14.47 1,040 1953 June 8 5.42 146
1955 June 13 12.97 902
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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 -- -- -- -- -- 299.2 456.0 268.5 58.5 21.7 4.81 68.9 --
1946 39.0 14.2 4.09 0.439 0.189 212.1 286.7 44.0 8.11 9.62 1.35 4.67 52.2
1947 3.25 6.43 8.48 6.46 3.68 6.75 184.2 36.2 587.9 106.3 38.1 12.3 82.7
1948 29.5 25.9 12.0 2.43 0.059 0.790 829.6 535.0 99.4 300.9 107.7 2.98 162.2
1949 0.171 1.70 4.88 0.639 0 0.674 505.9 76.3 59.1 7.05 21.4 1.95 56.2
1950 12.7 21.7 6.55 3.36 2.53 1.88 826.7 2,523 612.5 354.3 44.4 85.1 377.4
1951 168.3 25.2 11.4 8.40 5.41 10.6 899.5 400.0 52.6 5.34 2.18 2.63 132.4
1952 25.1 10.5 1.03 0.335 2.02 3.76 124.3 6.79 4.42 0.913 0.910 0 14.9
1953 0.416 4.09 0.368 0.048 6.61 6.68 30.0 22.2 70.1 4.03 1.94 1.41 12.2
1954 3.51 0.570 0.261 0.100 0.568 4.25 209.6 158.0 217.8 14.0 7.14 5.77 51.6
1955 1.38 2.77 1.34 0.206 0.207 0.448 441.7 91.0 412.2 57.9 4.99 8.70 84.5
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