11181008 CASTRO VALLEY CREEK AT HAYWARD, CA
LOCATION.-Lat 37°40'48", long 122°04'46", in San Lorenzo (Castro) Grant, Alameda County, Hydrologic
Unit 18050004, on left bank, 500 ft east of Hayward City Hall, 700 ft upstream from mouth, and 700 ft downstream
from small left-bank tributary.
DRAINAGE AREA.-5.51 mi2.
PERIOD OF RECORD.-October 1971 to current year (seasonal records only, water years 1975-77).
GAGE.-Water-stage recorder and crest-stage gage. Elevation of gage is 100 ft above sea level, from topographic
map.
REMARKS.-Records good. No regulation or diversion upstream from station.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 1,550 ft3/s, Feb. 2, 1998, gage height, 9.12 ft,
from rating curve extended above 61 ft3/s on basis of slope-area measurement at gage height 3.92 ft
and step-backwater computation to gage height 10.40 ft; no flow at times.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 500 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Nov. 30 0955 863 6.81 Jan. 19 2210 674 6.04
Dec. 5 2005 672 6.03 Feb. 9 0435 700 6.15
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 .27 .33 2.2 .35 1.8 2.2 1.5 .75 .82 .50 .42 .42
2 .26 .25 .96 .33 1.3 2.2 1.3 1.4 .59 .54 .50 .34
3 .25 .24 16 .33 1.2 12 1.2 2.2 .75 .37 .51 .28
4 .23 .33 1.1 .54 1.1 2.0 1.1 .77 .65 .40 .54 .27
5 .23 .24 17 .38 .89 1.8 24 .75 .54 .38 .66 .25
6 .23 3.0 2.4 .33 32 1.6 6.6 .71 .55 .49 2.0 .26
7 .22 11 .95 .33 96 1.4 2.0 .82 .71 .48 .48 .29
8 .23 5.3 .71 .32 11 4.7 26 .70 .61 .46 .42 .36
9 .33 .50 .60 .34 59 23 3.2 .67 .65 .39 .41 .65
10 .24 1.3 .54 .32 7.2 2.5 4.4 .69 .55 .38 .45 .31
11 .23 .78 .54 .32 4.3 1.9 15 .72 .57 .38 .49 .25
12 .23 .35 .58 .31 3.1 1.6 3.2 .88 .49 .44 .41 .24
13 .25 1.2 6.2 .34 6.5 1.5 3.0 .61 .46 .47 .42 .29
14 .25 .32 .87 .30 2.8 24 2.0 .59 .56 .46 .37 .34
15 .25 .31 .49 14 2.0 11 1.7 .58 .56 .37 .36 .28
16 .57 .33 .45 6.8 42 3.2 1.5 .57 .51 .49 .40 .32
17 .24 1.5 .44 .69 52 2.3 1.4 1.1 .49 .34 .38 .27
18 .23 .30 .42 52 15 2.0 1.3 .58 .51 .45 .38 .25
19 .22 .29 .40 68 5.9 8.4 1.3 1.1 .45 .50 .41 .25
20 .21 .30 1.3 19 33 3.0 1.2 .62 .46 .48 .35 .43
21 .23 2.1 .40 4.2 19 2.7 1.2 .63 .53 .46 .34 .30
22 .22 2.1 .39 2.1 7.4 3.8 1.0 .59 .48 .44 .34 3.1
23 .22 19 .40 34 4.8 5.1 1.6 .61 .56 .38 .33 .39
24 20 .93 .36 3.5 3.8 13 1.2 .62 .45 .39 .55 .62
25 .57 .47 .36 2.1 18 13 .89 .59 .46 .40 .38 .23
26 .33 1.4 .38 19 4.0 3.2 .89 .63 .45 .41 .33 .22
27 .28 7.9 .36 2.7 3.0 2.3 .83 .61 .45 .56 .34 .26
28 .26 4.2 .37 1.7 2.5 1.9 .82 .72 .57 .47 .34 .27
29 .27 9.9 .37 1.5 --- 1.7 .84 .55 .50 .46 .36 .28
30 .27 55 .40 1.2 --- 3.7 1.9 .56 .63 .45 .48 .19
31 .25 --- .41 20 --- 3.2 --- .56 --- .42 .40 ---
TOTAL 28.07 131.17 58.35 257.33 440.59 165.9 114.07 23.48 16.56 13.61 14.55 12.21
MEAN .91 4.37 1.88 8.30 15.7 5.35 3.80 .76 .55 .44 .47 .41
MAX 20 55 17 68 96 24 26 2.2 .82 .56 2.0 3.1
MIN .21 .24 .36 .30 .89 1.4 .82 .55 .45 .34 .33 .19
AC-FT 56 260 116 510 874 329 226 47 33 27 29 24
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1972 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 1.55 4.85 5.36 10.0 10.6 7.52 2.85 1.12 .58 .39 .38 .49
MAX 4.97 19.0 14.2 29.3 45.6 34.6 12.3 3.23 1.55 1.15 1.50 1.62
(WY) 1976 1974 1997 1998 1998 1983 1974 1990 1995 1974 1983 1983
MIN .15 .24 .24 .39 1.06 .60 .20 .30 .28 .17 .14 .12
(WY) 1978 1993 1990 1991 1977 1988 1977 1992 1980 1991 1980 1980
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1972 - 1999
ANNUAL TOTAL 2984.66 1275.89
ANNUAL MEAN 8.18 3.50 4.00
HIGHEST ANNUAL MEAN 9.14 1998
LOWEST ANNUAL MEAN 1.51 1972
HIGHEST DAILY MEAN 243 Feb 2 96 Feb 7 322 Jan 4
1982
LOWEST DAILY MEAN .21 Oct 20 .19 Sep 30 .00 Oct 11
1977
ANNUAL SEVEN-DAY MINIMUM .22 Oct 17 .22 Oct 17 .00 Oct 11
1977
INSTANTANEOUS PEAK FLOW 863 Nov 30 1550 Feb 2
1998
INSTANTANEOUS PEAK STAGE 6.81 Nov 30 9.12 Feb 2
1998
ANNUAL RUNOFF (AC-FT) 5920 2530 2900
10 PERCENT EXCEEDS 17 7.3 6.8
50 PERCENT EXCEEDS .90 .56 .48
90 PERCENT EXCEEDS .26 .27 .19
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