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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 3.33 1955 0 m 0.530 1.01 1.90 0.32
November 2.66 1955 0 m 0.580 0.87 1.50 0.35
December 1.77 1955 0 m 0.540 0.71 1.32 0.32
January 1.77 1951 0 m 0.200 0.52 2.58 0.12
February 8.93 1954 0 m 0.880 2.68 3.03 0.53
March 23.9 1947 0.161 1948 9.25 8.83 0.950 5.50
April 324 1950 7.16 1946 99.5 102 1.03 59.1
May 201 1950 1.15 1946 29.3 57.5 1.97 17.4
June 86.2 1954 0.193 1946 20.2 25.2 1.25 12.0
July 27.0 1954 1.15 1949 5.72 7.32 1.28 3.40
August 5.42 1954 0 m 0.720 1.59 2.20 0.43
September 5.72 1954 0 m 0.860 1.82 2.12 0.51
Annual 47.0 1950 2.93 1946 14.0 12.3 0.880 100
__________________________________________________________________________________________________________
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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 2.80 1.00 0 0 0 0 0 0 0 0
90 0 0 0 3.40 1.80 0.10 0.18 0 0 0 0 0 0
85 0 0 0 4.10 1.80 0.33 0.26 0 0 0 0 0 0
80 0 0 0 6.02 2.30 0.85 0.47 0 0 0 0 0 0
75 0 0 0 10.5 3.00 2.20 0.57 0 0 0 0 0 0
70 0 0 0 14.1 4.00 2.80 0.84 0 0 0 0 0 0
65 0 0 0 19.9 4.78 3.60 1.20 0 0 0 0 0 0
60 0 0 0 24.9 5.42 4.63 1.50 0 0 0 0 0 0
55 0 0 0 29.8 5.92 5.97 1.50 0 0 0 0 0 0.18
50 0 0 0 36.1 7.04 6.80 1.80 0 0 0 0 0 0.31
45 0 0 0.53 45.0 9.31 9.48 2.20 0.10 0 0 0.10 0.20 0.55
40 0 0 0.64 57.2 13.2 12.2 2.70 0.18 0 0 0.27 0.40 0.97
35 0 0 3.00 72.3 16.5 14.9 3.30 0.28 0.10 0.20 0.48 0.49 1.70
30 0.10 0 4.74 88.8 19.8 17.4 4.00 0.38 0.19 0.47 0.67 0.60 2.30
25 0.10 0 6.12 115 22.9 20.6 5.14 0.59 0.30 0.75 1.00 0.90 4.15
20 0.10 0 10.4 159 27.0 26.1 6.77 0.79 0.49 0.95 1.30 1.30 6.14
15 0.20 0.51 16.5 202 33.8 37.0 9.17 0.91 0.79 1.20 1.50 1.50 13.0
10 0.49 0.74 29.9 256 73.4 59.4 13.0 1.60 1.70 1.50 1.60 1.60 25.8
5 1.40 0.88 52.6 398 141 88.0 26.7 4.00 5.30 3.10 2.30 2.00 67.0
______________________________________________________________________________________________________________________
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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 29.6 13.4 11.9 9.08 6.34
0.95 1.05 63.4 33.2 28.4 21.4 14.6
0.90 1.11 93.8 52.5 44.1 32.8 22.1
0.80 1.25 148 89.3 73.6 53.9 36.0
0.50 2 342 231 184 130 85.9
0.20 5 744 545 423 287 189
0.10 10 1,090 826 634 419 276
0.04 25 1,620 1,250 955 612 405
0.02 50 2,080 1,620 1,230 772 513
0.01 100 2,580 2,020 1,530 942 628
0.005 200 3,120 2,460 1,850 1,120 752
0.002 500 3,920 ng ng ng ng
__________________________________________________________________________________________________
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Probability of annual low discharges
[ng, statistic not given]
____________________________________________________________________________________
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 ng ng ng ng ng ng 0 0 0
0.10 10 ng ng ng ng ng ng 0 0 0
0.20 5 ng ng ng ng ng ng 0 0 0
0.50 2 ng ng ng ng ng ng 0 0 0.025
____________________________________________________________________________________
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Probability of seasonal low discharges
[ng, statistic not given]
_____________________________________________________________________________________
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 ng ng ng ng ng ng 0 0.100
0.10 10 ng ng ng ng ng ng 0 0.240
0.20 5 ng ng ng ng ng ng 0 0.600
0.50 2 ng ng ng ng ng ng 0 2.58
June-July-August September-October-November
_________________________ _________________________
0.05 20 ng 0 0 0 ng ng 0 0
0.10 10 ng 0 0 0 ng ng 0 0
0.20 5 ng 0 0 0 ng ng 0 0
0.50 2 ng 0 0 0.120 ng ng 0 0
_____________________________________________________________________________________
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Annual peak discharge and corresponding gage height, period of record
_____________________________________________________________________________________
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
1946 March 21 2.26 132 1952 April 7 5.23 258
1947 March 23 5.44 200 1953 June 30 3.60 60.0
1948 April 18 6.45 1,220 1954 June 17 5.57 351
1949 April 7 6.20 846 1955 March 31 4.76 120
1950 April 18 6.62 1,430 1956 April 10 5.65 316
1951 April 7 5.85 340
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 18 6.62 1,430 1952 April 7 5.23 258
1948 April 18 6.45 1,220 1947 March 23 5.44 200
1949 April 7 6.20 846 1946 March 21 2.26 132
1954 June 17 5.57 351 1955 March 31 4.76 120
1951 April 7 5.85 340 1953 June 30 3.60 60.0
1956 April 10 5.65 316
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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
__________________________________________________________________________________________________________________________________
1946 0 0.293 0.400 0.097 0 23.2 7.16 1.15 0.193 2.25 0.013 0 2.93
1947 0 0.047 0.032 0 0 23.9 15.6 3.86 7.12 6.81 0.361 0.167 4.85
1948 0.577 0.677 0.619 0.113 0 0.161 210.1 29.3 3.24 1.19 0.239 0 20.3
1949 0 0 0 0 0 0.290 164.7 7.70 6.83 1.15 0 0 14.9
1950 0 0 0 0 0 3.42 324.2 200.7 30.7 4.94 0.271 0.117 47.0
1951 0.813 1.49 1.46 1.77 0.804 2.16 124.7 22.5 39.6 4.50 1.02 2.83 16.8
1952 1.13 1.22 1.54 0 0 5.90 114.1 10.6 3.19 6.55 0.029 0 11.9
1953 0 0 0 0 0 6.91 7.64 12.5 8.65 3.11 0 0 3.25
1954 0 0 0.081 0.045 8.93 5.16 8.44 3.21 86.2 27.0 5.42 5.72 12.4
1955 3.33 2.66 1.77 0.213 0 18.1 32.4 10.9 13.8 2.28 0.081 0 7.13
1956 0 0 0 0 0 12.6 85.6 19.5 22.9 3.19 0.519 0.597 12.0
__________________________________________________________________________________________________________________________________
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