11162800 REDWOOD CREEK AT REDWOOD CITY, CA
LOCATION.--Lat 37°26'58", long 122°13'57", in Pulgas Grant, San Mateo County, Hydrologic Unit 18050004, at Menlo
Country Club, on right bank 200 ft upstream from Alameda de Las Pulgas Bridge and 2.5 mi south of Redwood City
Old Post Office.
DRAINAGE AREA.--1.82 mi2.
PERIOD OF RECORD.--September 1959 to current year.
REVISED RECORDS.--WSP 1929: Drainage area.
GAGE.--Water-stage recorder. Datum of gage is 83.92 ft above sea level.
REMARKS.--Records good except for estimated daily discharges, which are fair. Low flow at times affected by
return flow from urban irrigation.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 644 ft3/s, Jan. 31, 1963, gage height, 9.36 ft, from rating
curve extended above 180 ft3/s on basis of slope-area measurement of peak flow and computation of peak flow
through culvert; maximum gage height, 11.55 ft, Nov. 29, 1970 (backwater from culvert trash racks); no flow at
times.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 130 ft3/s, or maximum.
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Jan. 16 1045 146 4.44 Feb. 4 1045 176 4.83
Jan. 27 0815 212 5.27 Feb. 21 0515 186 4.96
Jan. 31 0830 212 5.27
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 .05 .06 .08 .28 5.4 3.9 8.1 .37 .14 .08 e.05 .02
2 .05 .05 .06 .26 3.1 2.6 1.9 .33 .15 .07 e.04 .02
3 .05 .05 .06 .25 6.0 2.8 .90 .31 .15 .05 e.03 .02
4 .05 .05 .11 .25 46 17 .77 .29 .12 .05 e.04 .02
5 .05 .05 .05 .23 11 7.2 .70 .29 .12 .05 e.03 .02
6 .05 .05 .05 .22 4.6 3.3 .70 .28 .11 .05 e.03 .02
7 .05 .05 .05 .22 3.2 2.5 .68 .24 .11 .06 e.04 .02
8 .05 .05 .06 .22 2.7 2.1 .63 .26 .09 .06 e.03 .02
9 .04 .05 .05 .23 2.4 1.9 .61 .26 .08 .06 e.03 .02
10 .04 .06 .04 .22 2.0 1.7 .62 .24 .08 .05 e.04 .02
11 .05 .06 20 .24 1.8 1.8 .58 .24 .11 .05 e.03 .02
12 .05 .06 29 .22 1.7 40 .57 .22 .10 e.06 e.03 .02
13 .06 .07 5.6 .22 1.6 9.7 .56 .21 .10 e.06 e.04 .03
14 .06 .08 1.3 .22 1.5 3.7 .56 .22 .11 e.05 e.03 .03
15 .11 .09 9.9 .24 4.0 2.6 .61 2.0 .08 e.05 e.03 .03
16 .05 .09 1.1 35 2.1 2.2 2.3 2.0 .08 e.05 e.04 .02
17 .04 .09 .51 3.0 1.4 1.9 1.2 1.3 .10 e.04 e.04 .02
18 .04 .09 .44 20 4.5 1.7 .88 .67 .11 e.04 e.05 .02
19 .04 .09 .33 5.5 28 1.5 .61 .33 .09 e.05 e.03 .02
20 .05 .10 .27 6.2 21 1.4 .61 .31 .09 e.05 e.02 .02
21 .05 .10 .24 9.9 40 1.3 .57 .41 .10 e.05 e.02 .02
22 .04 .11 2.8 2.9 11 1.2 .58 .33 .12 e.06 e.03 .02
23 .04 .11 .72 1.8 5.2 1.1 .56 .28 .08 e.05 e.03 .02
24 .05 .09 .43 17 5.3 1.0 .56 .26 .06 e.05 e.04 .02
25 .05 .07 .34 12 3.7 .98 .54 .25 .08 e.04 e.04 .02
26 .05 .07 .29 2.7 2.9 .95 .50 .21 .07 e.05 e.04 .02
27 .05 .07 .32 26 3.7 .90 .48 .22 .07 e.07 .04 .02
28 .05 .07 .28 4.5 3.0 .97 .42 .20 .07 e.06 .04 .02
29 .05 .06 .70 2.3 8.7 .86 .40 .16 .06 e.05 .04 .02
30 .05 .07 .36 4.2 --- .79 .39 .15 .06 e.05 .03 .02
31 .05 --- .29 43 --- .71 --- .14 --- e.04 .03 ---
TOTAL 1.56 2.16 75.83 199.52 237.5 122.26 29.09 12.98 2.89 1.65 1.08 0.63
MEAN .050 .072 2.45 6.44 8.19 3.94 .97 .42 .096 .053 .035 .021
MAX .11 .11 29 43 46 40 8.1 2.0 .15 .08 .05 .03
MIN .04 .05 .04 .22 1.4 .71 .39 .14 .06 .04 .02 .02
AC-FT 3.1 4.3 150 396 471 243 58 26 5.7 3.3 2.1 1.2
e Estimated.
11162800 REDWOOD CREEK AT REDWOOD CITY, CA --Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1960 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .22 .80 1.65 3.81 3.49 2.67 .93 .24 .092 .041 .031 .037
MAX 2.93 4.84 7.44 13.0 13.9 11.5 4.90 1.26 .32 .15 .10 .17
(WY) 1963 1974 1971 1967 1986 1983 1982 1983 1983 1983 1983 1982
MIN .000 .003 .052 .065 .11 .18 .015 .003 .000 .000 .000 .000
(WY) 1960 1960 1960 1991 1977 1988 1977 1962 1961 1961 1961 1961
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1960 - 1996
ANNUAL TOTAL 690.02 687.15
ANNUAL MEAN 1.89 1.88 1.16
HIGHEST ANNUAL MEAN 3.67 1983
LOWEST ANNUAL MEAN .096 1961
HIGHEST DAILY MEAN 69 Mar 22 46 Feb 4 211 Jan 21 1967
LOWEST DAILY MEAN .04 Aug 28 .02 Aug 20 .00 Oct 1 1959
ANNUAL SEVEN-DAY MINIMUM .04 Sep 3 .02 Sep 1 .00 Oct 1 1959
INSTANTANEOUS PEAK FLOW 212 Jan 27 644 Jan 31 1963
INSTANTANEOUS PEAK STAGE 5.27 Jan 27 11.55 Nov 29 1970
ANNUAL RUNOFF (AC-FT) 1370 1360 839
10 PERCENT EXCEEDS 3.6 3.7 1.7
50 PERCENT EXCEEDS .26 .11 .10
90 PERCENT EXCEEDS .05 .03 .00
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