1998 California Hydrologic Data Report
11181040 SAN LORENZO CREEK AT SAN LORENZO, CA
- 1998 WY
11181040 SAN LORENZO CREEK AT SAN LORENZO, CA
LOCATION.-Lat 37°41'03", long 122°08'20", in San Lorenzo (Soto) Grant, Alameda County, Hydrologic Unit 18050004, on left bank 400 ft downstream from
Washington Ave. Bridge in San Lorenzo and 1.6 mi upstream from mouth.
DRAINAGE AREA.-44.6 mi2.
PERIOD OF RECORD.-October 1967 to September 1978, October 1987 to current year.
WATER TEMPERATURE: Water years 1989-93 (storm season only).
SEDIMENT DATA: Water years 1989-93 (storm season only).
GAGE.-Water-stage recorder and crest-stage gage. Datum of gage is 6.13 ft above sea level (levels by Alameda County Flood Control and Water Conservation
District).
REMARKS.-Records poor. Flow partly regulated by Cull Creek Reservoir beginning in October 1962 (capacity, 310 acre-ft) and Don Castro Reservoir (capacity, 380
acre-ft) 7 mi upstream beginning in January 1965. A few very small diversions upstream from station.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 10,300 ft3/s, Feb. 3, 1998, gage height, 14.27 ft from rating curve extended above 1,200
ft3/s; minimum daily, 0.01 ft3/s, several days in June and July, 1977.
EXTREMES FOR 1997 WATER YEAR. (NOT PREVIOUSLY PUBLISHED).-
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Nov. 17 0625 2,520 7.01 Jan. 2 0740 5,440 9.62
Dec. 5 0615 1,170 5.71 Jan. 22 1955 3,430 7.81
Dec. 10 1025 1,360 5.93 Jan. 26 0625 3,220 7.63
Dec. 21 2220 1,330 5.89
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 850 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Jan. 12 unknown 3,770 8.12 Feb. 7 unknown 3,360 7.75
Jan. 15 unknown unknown unknown Feb. 14 unknown unknown unknown
Jan. 18 unknown unknown unknown Feb. 21 unknown 1,970 6.51
Feb. 3 unknown 10,300 14.27
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997
DAILY MEAN VALUES (NOT PREVIOUSLY PUBLISHED)
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 1.6 1.7 26 1300 59 15 6.7 4.1 2.8 5.5 1.0 2.6
2 1.6 1.6 3.5 1780 47 18 6.1 4.0 2.8 3.7 1.3 2.3
3 1.8 1.5 2.3 270 39 17 6.3 4.2 13 3.3 1.1 2.7
4 1.9 1.5 2.6 127 40 16 6.7 4.3 14 4.0 1.1 1.9
5 1.3 1.4 413 93 33 16 6.8 4.4 3.7 3.3 1.0 1.8
6 1.1 1.4 41 64 30 16 6.8 4.6 2.2 3.6 1.1 1.7
7 1.2 1.6 21 52 29 17 6.8 4.4 1.9 3.1 .99 1.8
8 .92 1.4 18 40 28 17 6.7 4.5 1.7 2.9 1.1 1.8
9 .76 1.4 23 32 26 18 6.5 4.5 1.8 2.8 .90 1.7
10 .70 1.4 434 28 24 18 6.4 4.5 1.9 2.7 .93 1.7
11 .73 1.4 55 25 23 19 6.2 4.9 2.2 2.1 .95 1.8
12 .76 1.5 55 68 22 16 5.9 5.0 2.5 2.0 .92 1.6
13 1.4 1.6 47 26 20 14 5.9 5.0 2.3 1.9 .84 1.6
14 1.5 1.7 27 21 20 13 5.5 5.2 2.2 1.6 .80 1.7
15 1.4 1.8 24 48 19 14 5.2 5.2 2.0 1.6 .69 1.7
16 1.6 33 17 21 19 16 4.7 4.8 2.0 1.3 .66 1.6
17 2.0 397 16 19 31 12 4.6 4.8 2.0 1.2 .63 1.8
18 2.4 33 15 19 19 10 45 4.8 1.9 1.2 .74 2.0
19 2.7 28 14 18 19 9.7 46 4.7 1.9 1.2 7.0 2.1
20 2.4 13 14 51 19 9.5 4.3 4.9 2.0 1.2 38 2.5
21 2.3 6.0 812 48 18 9.3 3.1 5.1 1.6 1.3 3.7 2.7
22 1.9 69 278 693 18 8.6 2.9 4.8 1.7 1.6 2.1 3.0
23 1.7 15 65 369 17 8.2 3.1 19 1.8 1.5 1.8 3.0
24 2.3 4.7 38 231 16 7.9 2.7 7.7 1.7 1.6 2.0 2.8
25 3.7 3.4 30 837 16 7.3 2.3 4.6 1.6 1.6 2.1 2.6
26 1.9 2.8 53 1160 17 7.3 2.1 3.4 1.7 1.8 2.1 2.3
27 1.2 2.2 110 217 17 7.1 2.4 3.1 1.2 2.4 2.1 2.1
28 1.1 3.1 46 128 16 6.8 2.9 3.0 .86 2.0 2.1 1.9
29 53 2.1 68 94 --- 7.0 3.5 3.5 .92 1.9 2.1 1.8
30 19 1.8 56 76 --- 6.7 3.9 3.8 14 1.2 3.7 1.5
31 2.5 --- 40 67 --- 6.9 --- 3.1 --- 1.3 2.3 ---
TOTAL 120.37 637.0 2864.4 8022 701 384.3 228.0 153.9 93.88 68.4 87.85 62.1
MEAN 3.88 21.2 92.4 259 25.0 12.4 7.60 4.96 3.13 2.21 2.83 2.07
MAX 53 397 812 1780 59 19 46 19 14 5.5 38 3.0
MIN .70 1.4 2.3 18 16 6.7 2.1 3.0 .86 1.2 .63 1.5
AC-FT 239 1260 5680 15910 1390 762 452 305 186 136 174 123
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1968 - 1997, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 5.27 8.85 25.6 71.1 50.2 43.0 20.8 8.30 3.79 1.66 1.40 1.76
MAX 30.2 38.1 106 259 183 154 108 31.9 17.0 3.52 3.25 4.58
(WY) 1992 1974 1971 1997 1969 1995 1974 1996 1993 1993 1969 1975
MIN .23 1.49 1.41 1.14 2.15 1.83 2.07 .85 .066 .64 .11 .35
(WY) 1978 1991 1990 1991 1977 1972 1976 1972 1977 1990 1977 1988
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1968 - 1997
ANNUAL TOTAL 15893.87 13423.20
ANNUAL MEAN 43.4 36.8 20.1
HIGHEST ANNUAL MEAN 40.9 1974
LOWEST ANNUAL MEAN 2.38 1977
HIGHEST DAILY MEAN 948 Feb 21 1780 Jan 2 2400 Jan 21 1970
LOWEST DAILY MEAN .70 Oct 10 .63 Aug 17 .01 Jun 12 1977
ANNUAL SEVEN-DAY MINIMUM .88 Oct 6 .75 Aug 12 .01 Jun 10 1977
INSTANTANEOUS PEAK FLOW 5440 Jan 2 5440 Jan 2 1997
INSTANTANEOUS PEAK STAGE 9.62 Jan 2 9.62 Jan 2 1997
ANNUAL RUNOFF (AC-FT) 31530 26620 14530
10 PERCENT EXCEEDS 77 47 42
50 PERCENT EXCEEDS 6.1 3.8 2.4 90 PERCENT EXCEEDS 1.4
1.3 .57
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 1.5 3.0 e19 e5.0 121 e95 e55 25 16 e9.1 3.8 2.5
2 3.5 2.9 e13 e50 e1080 e87 60 24 14 e9.0 3.3 2.3
3 2.0 2.8 e8.7 e28 e2340 e82 e131 22 12 e9.5 3.3 2.3
4 1.8 2.8 e7.1 e186 e434 e72 e134 22 11 e8.4 3.3 2.1
5 1.6 2.4 e11 e25 e297 e92 91 63 9.5 e7.3 3.5 2.2
6 1.5 2.5 e7.6 e19 e732 e81 75 22 8.7 e7.8 2.8 2.3
7 1.4 2.6 e218 e19 e677 e76 78 19 11 e6.4 2.9 2.2
8 1.5 2.6 e83 e13 e498 e67 68 20 12 e7.0 3.4 2.1
9 69 2.7 e22 e23 e280 e57 61 18 11 e6.4 3.5 2.3
10 10 38 e11 e95 e224 e52 59 17 11 e7.6 3.4 2.8
11 4.3 15 e8.3 e275 e196 e49 58 21 12 7.5 3.4 2.7
12 3.4 e4.8 e7.0 e981 e214 e52 e53 27 12 6.6 3.3 2.5
13 3.1 e7.2 e6.2 e187 e162 e260 e202 20 11 6.2 3.2 2.1
14 3.0 e9.3 e65 e145 e474 e77 e80 17 11 6.2 2.8 2.1
15 3.4 62 e14 e723 e235 e64 e60 16 10 5.7 3.1 2.1
16 4.2 13 e9.0 e280 e240 e62 e56 16 9.7 5.7 3.2 e2.2
17 4.3 4.6 e8.2 e174 e184 55 e51 16 8.5 5.0 3.1 e1.9
18 4.5 e4.6 e7.5 e891 e147 52 e49 15 8.1 5.1 5.7 e1.6
19 4.1 e12 e6.4 e347 e347 47 e46 15 8.2 4.9 3.7 e1.8
20 3.9 e2.5 e6.0 198 e183 44 e41 15 8.2 4.4 3.2 e1.7
21 3.6 e2.0 e6.0 e145 e549 45 e44 15 8.1 4.6 3.4 e1.5
22 3.5 e2.2 e5.4 119 e260 42 e43 16 8.1 5.2 3.3 e1.1
23 3.2 e2.4 e5.0 92 e336 e164 e33 16 8.5 5.3 3.0 e1.1
24 3.4 e22 e4.9 78 e197 e153 e32 15 9.4 4.5 2.9 e1.1
25 2.9 e37 e5.0 65 e164 e123 e26 15 e8.6 4.4 3.0 e1.2
26 2.6 e256 e4.7 55 e137 e73 e24 16 e8.4 4.2 3.3 e1.5
27 2.6 e38 e5.1 e70 e119 82 e21 24 e7.7 4.2 3.0 e1.9
28 2.3 e14 e5.4 e53 e106 78 26 127 e8.2 4.2 2.6 e3.0
29 2.5 e24 e5.4 391 --- 64 27 25 e8.5 4.4 2.5 e2.8
30 2.7 e59 e5.3 91 --- 59 23 18 e8.4 4.6 2.6 e3.3
31 2.9 --- e5.1 88 --- e88 --- 18 --- 4.4 2.7 ---
TOTAL 164.2 653.9 595.3 5911.0 10933 2494 1807 735 298.8 185.8 100.2 62.3
MEAN 5.30 21.8 19.2 191 390 80.5 60.2 23.7 9.96 5.99 3.23 2.08
MAX 69 256 218 981 2340 260 202 127 16 9.5 5.7 3.3
MIN 1.4 2.0 4.7 5.0 106 42 21 15 7.7 4.2 2.5 1.1
AC-FT 326 1300 1180 11720 21690 4950 3580 1460 593 369 199 124
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1968 - 1998, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 5.27 9.44 25.3 76.5 65.6 44.7 22.6 9.00 4.07 1.86 1.48 1.77
MAX 30.2 38.1 106 259 390 154 108 31.9 17.0 5.99 3.25 4.58
(WY) 1992 1974 1971 1997 1998 1995 1974 1996 1993 1998 1969 1975
MIN .23 1.49 1.41 1.14 2.15 1.83 2.07 .85 .066 .64 .11 .35
(WY) 1978 1991 1990 1991 1977 1972 1976 1972 1977 1990 1977 1988
SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1968 - 1998
ANNUAL TOTAL 11214.83 23940.5
ANNUAL MEAN 30.7 65.6 22.1
HIGHEST ANNUAL MEAN 65.6 1998
LOWEST ANNUAL MEAN 2.38 1977
HIGHEST DAILY MEAN 1780 Jan 2 2340 Feb 3 2400 Jan 21 1970
LOWEST DAILY MEAN .63 Aug 17 1.1 Sep 22 .01 Jun 12 1977
ANNUAL SEVEN-DAY MINIMUM .75 Aug 12 1.3 Sep 20 .01 Jun 10 1977
INSTANTANEOUS PEAK FLOW 10300 Feb 3 10300 Feb 3 1998
INSTANTANEOUS PEAK STAGE 14.27 Feb 3 14.27 Feb 3 1998
ANNUAL RUNOFF (AC-FT) 22240 47490 16030
10 PERCENT EXCEEDS 38 168 45
50 PERCENT EXCEEDS 4.5 11 2.6
90 PERCENT EXCEEDS 1.6 2.5 .59
e Estimated.
1998 California Hydrologic Data Report Index
USGS Water Resources of California
Contact:
webmaster@maildcascr.wr.usgs.gov
Last modified: Wed Aug 4 09:40:26 PDT 1999