11012000 COTTONWOOD CREEK ABOVE TECATE CREEK, NEAR DULZURA, CA
LOCATION.--Lat 32°34'30", long 116°45'11", in NW 1/4 SW 1/4 sec.26, T.18 S., R.2 E., San Diego County, Hydrologic
Unit 18070305, on right bank 0.8 mi upstream from confluence with Tecate Creek, 5.1 mi south of Dulzura, and
11.3 mi downstream from Barrett Lake.
DRAINAGE AREA.--310 mi2.
PERIOD OF RECORD.--October 1936 to current year.
REVISED RECORDS.--WSP 1245: 1937-1938. WSP 1928: Drainage area.
GAGE.--Water-stage recorder. Datum of gage is 569.40 ft above sea level (levels by International Boundary and
Water Commission).
REMARKS.--Records fair except for estimated daily discharges, which are poor. Flow regulated by Morena
Reservoir, capacity, 50,210 acre-ft, and Barrett Lake (station 11011000), capacity, 44,760 acre-ft. Water
diverted from Barrett Lake through San Diego and Dulzura Conduits to Lower Otay Lake (station 11014550).
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,700 ft3/s, Feb. 21, 1980, gage height, 11.15 ft, from
rating curve extended above 8,700 ft3/s; no flow for part of each year.
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 .00 .20 .06 .37 e9.0 2.4 2.4 .00 .00 .00 .00 .00
2 .00 .23 .07 .35 e6.0 2.1 2.3 .01 .00 .00 .00 .00
3 .00 .14 .12 .30 e3.0 2.0 2.2 .05 .00 .00 .00 .00
4 .00 .12 .13 .35 e2.0 2.0 2.0 .08 .00 .00 .00 .00
5 .00 .09 .13 e.35 e1.8 2.4 1.6 .06 .00 .00 .00 .00
6 .00 .07 e.15 e.37 e1.7 2.2 1.3 .00 .00 .00 .00 .00
7 .00 .06 e.14 e.35 e1.6 1.9 1.1 .00 .00 .00 .00 .00
8 .00 .02 .16 e.35 e1.6 1.8 1.1 .00 .00 .00 .00 .00
9 .00 .01 .14 e.36 1.6 1.6 1.0 .00 .00 .00 .00 .00
10 .00 .06 .12 e.38 1.6 1.6 1.0 .00 .00 .00 .00 .00
11 .00 .12 .10 e.36 1.6 1.6 1.0 .00 .00 .00 .00 .00
12 .00 .10 .12 e.35 1.9 2.8 1.0 .00 .00 .00 .00 .00
13 .00 .09 .23 e.37 1.8 28 .94 .00 .00 .00 .00 .00
14 .00 .09 .25 e.45 1.9 24 .91 .00 .00 .00 .00 .00
15 .00 .12 .18 e.55 2.0 13 .72 .00 .00 .00 .00 .00
16 .00 .13 .16 e.60 2.1 8.8 .69 .00 .00 .00 .00 .00
17 .00 .12 .16 e1.0 2.2 6.5 .68 .00 .00 .00 .00 .00
18 .00 .10 .16 e1.0 2.2 5.6 1.1 .00 .00 .00 .00 .00
19 .00 .08 .16 e1.0 2.2 4.8 .92 .00 .00 .00 .00 .00
20 .00 .06 .24 e.90 2.2 4.3 .78 .00 .00 .00 .00 .00
21 .00 .07 .27 e.90 2.2 3.9 .73 .00 .00 .00 .00 .00
22 .00 .09 .22 e7.0 2.4 3.6 .65 .00 .00 .00 .00 .00
23 .00 .09 .28 e5.0 2.0 3.5 .53 .00 .00 .00 .00 .00
24 .00 .08 .29 e3.0 2.0 3.1 .39 .00 .00 .00 .00 .00
25 .00 .06 .24 e2.0 2.8 3.0 .35 .00 .00 .00 .00 .00
26 .00 .07 .24 e2.5 14 2.8 .28 .00 .00 .00 .00 .00
27 .00 .09 .25 e2.0 6.4 2.7 .26 .00 .00 .00 .00 .00
28 .00 .05 .26 e1.9 4.3 2.7 .24 .00 .00 .00 .00 .00
29 .00 .05 .29 e1.8 3.3 2.9 .15 .00 .00 .00 .00 .00
30 .05 .06 .37 e1.9 --- 2.7 .02 .00 .00 .00 .00 .00
31 .09 --- .39 e2.3 --- 2.5 --- .00 --- .00 .00 ---
TOTAL 0.14 2.72 6.08 40.41 89.4 152.8 28.34 0.20 0.00 0.00 0.00 0.00
MEAN .005 .091 .20 1.30 3.08 4.93 .94 .006 .000 .000 .000 .000
MAX .09 .23 .39 7.0 14 28 2.4 .08 .00 .00 .00 .00
MIN .00 .01 .06 .30 1.6 1.6 .02 .00 .00 .00 .00 .00
AC-FT .3 5.4 12 80 177 303 56 .4 .00 .00 .00 .00
e Estimated.
TIJUANA RIVER BASIN
11012000 COTTONWOOD CREEK ABOVE TECATE CREEK, NEAR DULZURA, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1937 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 1.22 .80 2.57 19.8 53.7 73.8 36.4 13.1 4.76 1.49 1.16 1.17
MAX 66.0 18.8 40.5 605 1200 1443 676 296 99.5 47.5 24.4 57.4
(WY) 1994 1984 1984 1993 1980 1983 1941 1983 1980 1980 1980 1993
MIN .000 .000 .000 .000 .000 .000 .000 .000 .000 .000 .000 .000
(WY) 1937 1937 1950 1951 1951 1951 1955 1947 1940 1939 1938 1937
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1937 - 1996
ANNUAL TOTAL 42727.82 320.09
ANNUAL MEAN 117 .87 17.3
HIGHEST ANNUAL MEAN 243 1983
LOWEST ANNUAL MEAN .000 1956
HIGHEST DAILY MEAN 5910 Mar 6 28 Mar 13 8430 Feb 21 1980
LOWEST DAILY MEAN .00 Sep 6 .00 Oct 1 .00 Oct 1 1936
ANNUAL SEVEN-DAY MINIMUM .00 Sep 6 .00 Oct 1 .00 Oct 1 1936
INSTANTANEOUS PEAK FLOW 47 Mar 13 11700 Feb 21 1980
INSTANTANEOUS PEAK STAGE 2.84 Mar 13 11.15 Feb 21 1980
ANNUAL RUNOFF (AC-FT) 84750 635 12520
10 PERCENT EXCEEDS 215 2.3 11
50 PERCENT EXCEEDS 9.5 .05 .00
90 PERCENT EXCEEDS .00 .00 .00
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