11180810 PALOMARES CREEK NEAR HAYWARD, CA
LOCATION.-Lat 37°41'40", long 122°01'26", in San Lorenzo Grant, Alameda County, Hydrologic Unit
18050004, on left bank, at Palomares School, 0.1 mi upstream of confluence with San Lorenzo Creek, and 3.6 mi
northeast of Hayward.
DRAINAGE AREA.-9.08 mi2.
PERIOD OF RECORD.-October 1997 to current year.
GAGE.-Water-stage recorder and crest-stage gage. Elevation of gage is 310 ft above sea level, from topographic
map.
REMARKS.-Records fair including estimated daily discharges. No regulation or diversion upstream from station.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 1,940 ft3/s, Feb. 3, 1998, gage height, 10.67 ft,
from rating curve extended above 300 ft3/s. Minimum daily, 0.01 ft3/s, Sept. 4, 7, 1999.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 250 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Feb. 7 1130 605 5.69
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 .38 e.18 .65 .78 4.3 11 5.4 2.9 1.3 .48 .28 .16
2 .28 e.21 .53 .78 3.8 10 5.0 2.9 1.4 .46 .24 .05
3 .24 e.19 .87 .74 3.5 12 4.7 3.0 1.3 .52 .21 .06
4 .21 e.18 .56 .74 3.2 9.3 4.4 2.7 1.2 .53 .25 .01
5 .16 e.22 .97 .76 2.8 8.6 7.4 2.5 1.1 .50 .31 .03
6 .17 e1.0 .74 .73 6.8 8.1 6.4 2.4 1.1 .48 .35 .03
7 .19 e1.6 .57 .71 134 7.5 5.3 2.3 1.0 .49 .28 .01
8 .19 e1.0 .57 .69 23 7.2 12 2.2 1.1 .45 .23 .02
9 .17 e.55 .54 .68 85 12 9.2 2.1 1.0 .41 .25 .12
10 .20 e.50 .61 .69 26 8.2 8.0 2.1 .94 .34 .29 .14
11 .18 e.48 .61 .64 15 7.5 12 2.0 .98 .32 .30 .12
12 .17 e.46 .62 .70 11 7.0 9.6 2.0 .89 .27 .27 .20
13 .19 e.42 1.0 .64 9.2 6.8 8.7 2.0 .88 1.2 .24 .29
14 .19 e.38 .76 .64 7.9 7.8 8.2 1.9 .89 .30 .22 .31
15 .19 e.35 .72 .79 6.5 9.7 7.7 1.8 .91 .27 .19 .19
16 .17 e.32 .70 e2.3 11 7.6 7.0 1.8 .88 .26 .20 .07
17 .14 e.33 .72 e1.1 36 7.1 6.4 1.7 .81 .27 .20 .10
18 .16 e.40 .72 e5.0 23 6.7 5.8 1.7 .75 .25 .24 .17
19 .15 e.30 .72 e18 18 7.2 5.5 1.7 .77 .26 .21 .19
20 .15 e.23 .76 e19 26 6.8 5.2 1.7 .76 .25 .18 .14
21 .16 e.18 .73 e7.2 42 6.4 5.0 1.7 .77 .24 .13 .17
22 .18 .29 .77 e3.0 27 6.1 4.7 1.5 .70 .19 .11 .16
23 .21 .87 .76 e18 21 6.4 4.3 1.5 .63 .41 .07 .27
24 .49 .17 .74 6.2 18 6.7 4.0 1.5 .68 .45 .10 .35
25 .21 .16 .76 4.4 22 9.1 3.8 1.5 .68 .42 .08 .32
26 .20 .16 .78 8.9 16 7.3 3.6 1.5 .64 .40 .08 .16
27 e.21 .42 .73 6.1 14 6.8 3.5 1.5 .62 .37 .07 .14
28 e.20 .62 .74 4.6 12 6.3 3.3 1.5 .55 .28 .06 .13
29 e.19 .82 .76 3.9 --- 6.0 3.1 1.6 .51 .26 .09 .30
30 e.19 1.9 .79 3.5 --- 5.8 3.0 1.4 .51 .27 .12 .35
31 e.17 --- .79 9.4 --- 6.4 --- 1.3 --- .28 .15 ---
TOTAL 6.29 14.89 22.29 131.31 628.0 241.4 182.2 59.9 26.25 11.88 6.00 4.76
MEAN .20 .50 .72 4.24 22.4 7.79 6.07 1.93 .88 .38 .19 .16
MAX .49 1.9 1.0 19 134 12 12 3.0 1.4 1.2 .35 .35
MIN .14 .16 .53 .64 2.8 5.8 3.0 1.3 .51 .19 .06 .01
AC-FT 12 30 44 260 1250 479 361 119 52 24 12 9.4
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1998 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .14 .53 .95 17.5 47.3 10.2 8.06 2.55 1.29 .57 .28 .22
MAX .20 .57 1.18 30.8 72.1 12.6 10.0 3.16 1.70 .76 .37 .27
(WY) 1999 1998 1998 1998 1998 1998 1998 1998 1998 1998 1998 1998
MIN .082 .50 .72 4.24 22.4 7.79 6.07 1.93 .88 .38 .19 .16
(WY) 1998 1999 1999 1999 1999 1999 1999 1999 1999 1999 1999 1999
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1998 - 1999
ANNUAL TOTAL 3903.29 1335.17
ANNUAL MEAN 10.7 3.66 7.19
HIGHEST ANNUAL MEAN 10.7 1998
LOWEST ANNUAL MEAN 3.66 1999
HIGHEST DAILY MEAN 410 Feb 3 134 Feb 7 410 Feb 3
1998
LOWEST DAILY MEAN .14 Oct 17 .01 Sep 4 .01 Sep 4
1999
ANNUAL SEVEN-DAY MINIMUM .16 Oct 16 .03 Sep 2 .03 Sep 2
1999
INSTANTANEOUS PEAK FLOW 605 Feb 7 1940 Feb 3
1998
INSTANTANEOUS PEAK STAGE 5.69 Feb 7 10.67 Feb 3
1998
ANNUAL RUNOFF (AC-FT) 7740 2650 5210
10 PERCENT EXCEEDS 25 8.8 16
50 PERCENT EXCEEDS 1.1 .74 .80
90 PERCENT EXCEEDS .21 .16 .16
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