11180960 CULL CREEK ABOVE CULL CREEK RESERVOIR, NEAR CASTRO VALLEY, CA
LOCATION.-Lat 37°42'55", long 122°03'12", in San Lorenzo (Castro) Grant, Alameda County, Hydrologic
Unit 18050004, on left bank, 0.9 mi upstream from Cull Creek Dam, and 1.1 mi northeast of Castro Valley Post
Office.
DRAINAGE AREA.-5.79 mi2.
WATER-DISCHARGE RECORDS
PERIOD OF RECORD.-October 1978 to current year.
REVISED RECORDS.-WDR CA-80-2: 1979(P).
GAGE.-Water-stage recorder and crest-stage gage. Elevation of gage is 450 ft above sea level, from topographic
map.
REMARKS.-Records fair except for estimated daily discharges, which are poor. No storage or diversions upstream
from station.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 1,690 ft3/s, Jan. 5, 1982, gage height, 8.71 ft; no
flow for many days each year.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 150 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Feb. 7 1130 683 4.99 Feb. 17 0145 271 3.21
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 .04 .07 1.7 .12 2.9 8.2 4.6 1.9 .69 e.28 .10 .04
2 .04 .07 .16 .13 2.6 9.9 3.9 1.9 .69 e.25 .09 .04
3 .04 .07 1.3 .21 2.4 15 3.2 2.1 .66 .24 .09 .04
4 .03 .06 .40 .17 2.3 8.2 3.0 1.7 .66 .24 .09 .04
5 .03 .07 .60 .37 2.0 7.8 5.8 1.6 .64 .22 .10 .03
6 .02 .07 1.4 .29 13 7.4 4.6 1.4 .58 .21 .15 .03
7 .04 .61 .38 .24 149 6.8 4.0 1.3 .55 .22 .12 .03
8 .05 .48 .29 .07 28 22 12 1.1 .55 .20 .09 .03
9 .06 .38 .24 .10 99 35 3.5 .81 .53 .18 .09 .04
10 .06 .24 .22 .14 37 17 3.0 .79 .51 .18 .09 .03
11 .06 .21 .16 .14 21 18 11 1.5 .50 .16 .10 .03
12 .06 .18 .15 .11 15 15 7.1 1.2 .55 .15 .10 .03
13 .06 .16 .29 .14 11 14 5.6 1.2 .56 .14 .09 .03
14 .06 .15 .57 .15 7.6 15 4.5 1.2 .60 .13 .08 .03
15 .06 .15 .42 .29 4.2 17 4.5 1.1 .47 .14 .07 .03
16 .06 .14 .35 .74 32 8.2 4.0 1.1 .51 .14 .07 .03
17 .06 .16 .35 .39 72 6.8 3.5 1.2 .52 .15 .07 .03
18 .07 .14 .32 6.5 24 6.6 3.2 1.3 .48 .15 .07 .03
19 .07 .12 .28 18 15 6.9 3.2 1.3 .46 .14 .07 .03
20 .07 .12 .24 21 31 6.8 3.0 1.3 .50 .14 .07 .02
21 .07 .12 .24 5.4 43 7.6 2.7 1.3 .40 .14 .06 .02
22 .07 .21 .26 3.0 26 7.3 2.6 1.1 .32 .13 .06 .03
23 .07 .83 .27 13 22 7.1 2.4 .94 .46 .12 .05 .02
24 .17 .60 .25 5.2 19 9.0 2.5 .78 .47 .13 .05 .02
25 .15 .22 .25 3.6 18 15 2.4 .57 .43 .13 .05 .02
26 .10 .20 .24 6.4 14 7.8 2.2 .80 .45 .13 .05 .02
27 .09 .25 .22 3.8 12 6.6 2.2 .80 e.36 .12 .05 .02
28 .09 .36 .18 3.0 11 6.0 1.9 .78 e.34 .12 .04 .02
29 .10 .73 .16 2.7 --- 5.6 2.2 .78 e.32 .11 .04 .01
30 .07 6.5 .15 2.5 --- 5.4 1.9 .71 e.30 .10 .04 .01
31 .07 --- .11 6.5 --- 6.0 --- .67 --- .10 .04 ---
TOTAL 2.09 13.67 12.15 104.40 736.0 335.0 120.2 36.23 15.06 4.99 2.33 0.83
MEAN .067 .46 .39 3.37 26.3 10.8 4.01 1.17 .50 .16 .075 .028
MAX .17 6.5 1.7 21 149 35 12 2.1 .69 .28 .15 .04
MIN .02 .06 .11 .07 2.0 5.4 1.9 .57 .30 .10 .04 .01
AC-FT 4.1 27 24 207 1460 664 238 72 30 9.9 4.6 1.6
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1979 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .044 .79 2.73 10.4 14.1 9.32 3.08 .88 .30 .085 .020 .008
MAX .45 6.00 14.0 43.7 58.9 54.3 16.8 3.56 1.27 .50 .13 .079
(WY) 1983 1984 1984 1997 1998 1983 1982 1983 1998 1998 1998 1983
MIN .000 .000 .001 .000 .045 .13 .055 .016 .007 .000 .000 .000
(WY) 1979 1987 1990 1991 1991 1988 1990 1988 1988 1981 1979 1979
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1979 - 1999
ANNUAL TOTAL 3245.86 1382.95
ANNUAL MEAN 8.89 3.79 3.42
HIGHEST ANNUAL MEAN 10.3 1983
LOWEST ANNUAL MEAN .054 1990
HIGHEST DAILY MEAN 369 Feb 3 149 Feb 7 445 Feb 15
1982
LOWEST DAILY MEAN .02 Oct 6 .01 Sep 29 .00 Oct 1
1978
ANNUAL SEVEN-DAY MINIMUM .03 Sep 19 .02 Sep 24 .00 Oct 1
1978
INSTANTANEOUS PEAK FLOW 683 Feb 7 1690 Jan 5
1982
INSTANTANEOUS PEAK STAGE 4.99 Feb 7 8.71 Jan 5
1982
ANNUAL RUNOFF (AC-FT) 6440 2740 2480
10 PERCENT EXCEEDS 22 10 6.5
50 PERCENT EXCEEDS .90 .32 .12
90 PERCENT EXCEEDS .06 .04 .00
11180960 CULL CREEK ABOVE CULL CREEK RESERVOIR, NEAR CASTRO VALLEY, CA-Continued
WATER-QUALITY RECORDS
PERIOD OF RECORD.-Water years 1979 to current year (storm season only).
WATER TEMPERATURE: Water years 1979 to current year.
SEDIMENT DATA: Water years 1979 to current year.
PERIOD OF DAILY RECORD.-October 1978 to current year.
WATER TEMPERATURE: October 1978 to current year.
SUSPENDED-SEDIMENT DISCHARGE: October 1978 to current year.
REMARKS.-Zero bed-load discharge observed at flows less than 4.80 ft3/s. Sediment samples were
collected on most days where a water temperature is published.
EXTREMES FOR PERIOD OF DAILY RECORD.-
SEDIMENT CONCENTRATION: Maximum daily mean, 24,400 mg/L, Mar. 13, 1993; minimum daily mean, no flow many days
during most years.
SEDIMENT LOAD: Maximum daily, 26,400 tons, Feb. 17, 1986; minimum daily, 0 ton many days during most years.
EXTREMES FOR CURRENT YEAR.-
SEDIMENT CONCENTRATION (storm season only): Maximum daily mean, 4,870 mg/L, Feb. 7; minimum daily mean, 9 mg/L,
Apr. 25, 26.
SEDIMENT LOAD (storm season only): Maximum daily, 3,650 tons, Feb. 7; minimum daily, 0 ton on many days.
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DIS- SEDI- SED. SED. SED.
CHARGE, MENT, SUSP. SUSP. SUSP.
INST. SEDI- DIS- FALL FALL FALL
CUBIC TEMPER- MENT, CHARGE, DIAM. DIAM. DIAM.
FEET ATURE SUS- SUS- % FINER % FINER % FINER
DATE TIME PER WATER PENDED PENDED THAN THAN THAN
SECOND (DEG C) (MG/L) (T/DAY) .002 MM .004 MM .008 MM
(00061) (00010) (80154) (80155) (70337) (70338) (70339)
NOV
30... 1215 37 -- 5460 545 46 57 66
JAN
20... 1800 19 11.5 1000 51 -- -- --
21... 1415 4.7 10.0 87 1.1 -- -- --
FEB
09... 0915 252 9.5 13100 8910 26 30 33
21... 0855 41 8.5 1430 158 34 41 46
MAR
31... 1715 4.7 10.5 52 .66 -- -- --
APR
01... 1050 4.5 6.0 30 .36 -- -- --
13... 1910 5.0 14.5 51 .69 -- -- --
29... 1530 2.0 15.0 10 .05 -- -- --
SED. SED. SED. SED. SED. SED. SED. SED.
SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP.
FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE SIEVE
DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM.
% FINER % FINER % FINER % FINER % FINER % FINER % FINER % FINER
DATE THAN THAN THAN THAN THAN THAN THAN THAN
.016 MM .031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM 2.00 MM
(70340) (70341) (70331) (70332) (70333) (70334) (70335) (70336)
NOV
30... 77 85 90 93 97 99 100 --
JAN
20... -- -- 91 93 96 98 100 --
21... -- -- 98 99 100 -- -- --
FEB
09... 40 52 63 76 91 97 99 100
21... 56 70 80 90 98 100 -- --
MAR
31... -- -- 51 -- -- -- -- --
APR
01... -- -- 51 -- -- -- -- --
13... -- -- 83 -- -- -- -- --
29... -- -- 48 -- -- -- -- --
TEMPERATURE, WATER (DEG. C), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY INSTANTANEOUS VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 --- --- --- --- 8.0 --- 6.0 --- --- 15.0 --- ---
2 --- --- --- --- --- --- --- --- --- --- --- ---
3 --- --- --- --- 8.5 --- --- --- --- --- --- ---
4 --- --- 7.0 6.5 --- 8.5 --- --- --- --- 14.5 ---
5 --- --- --- --- --- --- --- --- --- --- --- ---
6 13.0 --- 5.0 --- 8.0 --- 10.5 --- --- --- --- ---
7 --- --- 6.0 6.5 --- --- 10.0 --- --- --- --- ---
8 --- --- 7.5 --- 11.5 --- --- --- --- --- --- ---
9 --- --- --- --- 9.5 --- --- --- --- --- --- ---
10 --- --- --- --- --- 10.0 --- --- --- --- --- ---
11 --- --- 7.0 6.0 --- --- --- --- --- --- --- ---
12 --- --- --- --- --- --- --- --- --- --- --- ---
13 --- --- --- --- 8.0 10.0 14.5 --- --- --- --- ---
14 --- --- 9.0 8.0 10.0 --- --- --- --- --- --- ---
15 --- --- --- 8.0 --- 11.5 12.5 --- --- --- --- ---
16 --- --- --- 10.0 10.0 --- --- --- --- --- --- ---
17 --- --- 8.0 --- --- 12.5 --- --- --- --- --- ---
18 --- --- --- 11.0 11.0 --- --- --- --- --- --- ---
19 --- --- --- 11.5 --- 10.5 16.5 --- --- --- --- ---
20 --- --- --- 11.5 --- --- 14.5 --- --- --- --- ---
21 --- 8.0 2.5 10.0 8.5 --- --- --- --- --- --- ---
22 --- 10.0 --- --- --- 12.0 --- --- --- --- --- ---
23 --- 12.0 --- --- 9.5 --- --- --- --- --- --- ---
24 --- --- 2.5 --- 11.5 --- --- --- --- --- --- ---
25 --- 9.0 --- 8.5 --- --- 13.5 --- --- --- --- ---
26 --- --- --- 8.0 --- --- --- --- --- --- --- ---
27 --- --- --- 7.5 --- --- --- --- --- --- --- ---
28 --- --- 6.0 --- --- --- 13.0 --- --- --- --- ---
29 --- --- --- --- --- --- 15.0 --- --- --- --- ---
30 --- --- --- --- --- 12.0 --- --- --- --- --- ---
31 --- --- --- --- --- 10.5 --- --- --- --- --- ---
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
MEAN MEAN MEAN
MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT
DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE
DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY)
OCTOBER NOVEMBER DECEMBER
1 .04 16 .00 .07 11 .00 1.7 181 1.2
2 .04 16 .00 .07 11 .00 .16 71 .03
3 .04 16 .00 .07 11 .00 1.3 123 .88
4 .03 16 .00 .06 11 .00 .40 35 .04
5 .03 16 .00 .07 11 .00 .60 74 .38
6 .02 16 .00 .07 11 .00 1.4 428 2.1
7 .04 16 .00 .61 64 .16 .38 74 .08
8 .05 15 .00 .48 17 .02 .29 54 .04
9 .06 15 .00 .38 12 .01 .24 49 .03
10 .06 14 .00 .24 13 .01 .22 40 .02
11 .06 14 .00 .21 14 .01 .16 33 .01
12 .06 14 .00 .18 15 .01 .15 37 .01
13 .06 13 .00 .16 17 .01 .29 43 .04
14 .06 13 .00 .15 18 .01 .57 48 .07
15 .06 13 .00 .15 20 .01 .42 43 .05
16 .06 12 .00 .14 21 .01 .35 37 .04
17 .06 12 .00 .16 23 .01 .35 33 .03
18 .07 12 .00 .14 25 .01 .32 36 .03
19 .07 11 .00 .12 27 .01 .28 39 .03
20 .07 11 .00 .12 30 .01 .24 44 .03
21 .07 11 .00 .12 37 .01 .24 46 .03
22 .07 10 .00 .21 41 .02 .26 36 .03
23 .07 10 .00 .83 81 .40 .27 27 .02
24 .17 33 .02 .60 68 .13 .25 21 .01
25 .15 18 .01 .22 28 .02 .25 20 .01
26 .10 11 .00 .20 31 .02 .24 21 .01
27 .09 11 .00 .25 39 .03 .22 21 .01
28 .09 11 .00 .36 50 .05 .18 22 .01
29 .10 11 .00 .73 90 .22 .16 21 .01
30 .07 11 .00 6.5 389 26 .15 21 .01
31 .07 11 .00 --- --- --- .11 20 .01
TOTAL 2.09 --- 0.03 13.67 --- 27.20 12.15 --- 5.30
JANUARY FEBRUARY MARCH
1 .12 20 .01 2.9 35 .28 8.2 107 2.4
2 .13 19 .01 2.6 38 .26 9.9 99 2.7
3 .21 19 .01 2.4 43 .28 15 146 7.3
4 .17 18 .01 2.3 46 .28 8.2 84 1.9
5 .37 23 .02 2.0 48 .26 7.8 82 1.7
6 .29 32 .02 13 518 48 7.4 81 1.6
7 .24 40 .03 149 4870 3650 6.8 81 1.5
8 .07 33 .01 28 554 43 22 451 91
9 .10 25 .01 99 4400 1750 35 449 60
10 .14 19 .01 37 793 98 17 155 7.3
11 .14 15 .01 21 258 15 18 120 6.0
12 .11 16 .00 15 142 6.0 15 88 3.5
13 .14 19 .01 11 84 2.6 14 66 2.5
14 .15 23 .01 7.6 75 1.5 15 102 4.9
15 .29 36 .03 4.2 74 .85 17 171 10
16 .74 43 .09 32 775 201 8.2 77 1.7
17 .39 43 .04 72 1700 839 6.8 59 1.1
18 6.5 714 21 24 370 27 6.6 59 1.1
19 18 728 156 15 277 11 6.9 65 1.2
20 21 1420 124 31 728 120 6.8 63 1.2
21 5.4 176 2.9 43 1820 248 7.6 61 1.3
22 3.0 88 .72 26 652 46 7.3 58 1.2
23 13 883 44 22 227 14 7.1 58 1.1
24 5.2 95 1.5 19 167 8.4 9.0 93 3.0
25 3.6 25 .24 18 149 7.4 15 145 7.5
26 6.4 104 2.5 14 138 5.3 7.8 57 1.2
27 3.8 32 .34 12 127 4.0 6.6 57 1.0
28 3.0 28 .23 11 117 3.6 6.0 56 .90
29 2.7 28 .20 --- --- --- 5.6 55 .83
30 2.5 28 .19 --- --- --- 5.4 55 .81
31 6.5 310 11 --- --- --- 6.0 57 .96
TOTAL 104.40 --- 365.15 736.0 --- 7151.01 335.0 --- 230.40
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
MEAN
MEAN CONCEN- SEDIMENT
DISCHARGE TRATION DISCHARGE
DAY (CFS) (MG/L) (TONS/DAY)
APRIL
1 4.6 29 .37
2 3.9 19 .20
3 3.2 15 .13
4 3.0 12 .10
5 5.8 69 1.6
6 4.6 94 1.2
7 4.0 42 .46
8 12 182 13
9 3.5 28 .27
10 3.0 20 .16
11 11 91 4.1
12 7.1 50 .97
13 5.6 51 .76
14 4.5 44 .54
15 4.5 36 .43
16 4.0 29 .31
17 3.5 24 .23
18 3.2 19 .17
19 3.2 16 .14
20 3.0 19 .15
21 2.7 17 .13
22 2.6 15 .10
23 2.4 13 .08
24 2.5 11 .07
25 2.4 9 .06
26 2.2 9 .06
27 2.2 10 .06
28 1.9 10 .05
29 2.2 10 .06
30 1.9 10 .05
31 --- --- ---
TOTAL 120.2 --- 26.01
PERIOD 1323.47 7805.10
SUMMARY OF WATER AND SEDIMENT DISCHARGE, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
WATER SUSPENDED BEDLOAD TOTAL
MONTH DISCHARGE SEDIMENT DISCHARGE SEDIMENT
DISCHARGE DISCHARGE
CFS-DAYS TONS TONS TONS
OCTOBER 1998 2.09 0.03 0 0
NOVEMBER .... 13.67 27.20 3 30
DECEMBER .... 12.15 5.30 0 5
JANUARY 1999 104.40 365.15 31 396
FEBRUARY .... 736.00 7151.01 613 7760
MARCH ....... 335.00 230.40 82 312
APRIL ....... 120.20 26.01 7 33
PERIOD ...... 1323.51 7805.10 736 8536
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