11015000 SWEETWATER RIVER NEAR DESCANSO, CA
LOCATION.--Lat 32°50'05", long 116°37'20", in NW 1/4 SE 1/4 sec.25, T.15 S., R.3 E., San Diego County, Hydrologic
Unit 18070304, near right bank at Los Terrenitos Road bridge, 0.7 mi downstream from unnamed tributary, and
1.3 mi south of Descanso.
DRAINAGE AREA.--45.4 mi2.
PERIOD OF RECORD.--October 1905 to September 1927 (monthly discharge only for some months, published in
WSP 1315-B), October 1956 to current year. Prior to October 1927, records unadjusted for diversion. October
1956 to September 1977, both unadjusted records and combined records of river plus diversion
(station 11015001) were published. No diversion since November 1976.
REVISED RECORD.--WSP 1315-B: 1922(M). WDR CA-73-1: Drainage area.
GAGE.--Water-stage recorder. Datum of gage is 3,269.24 ft above sea level. Prior to June 25, 1927, nonrecording
gages at several sites and datums, upstream about 0.1 mi. Diversion gage at site 0.3 mi upstream, October
1956 to September 1984, at different datum.
REMARKS.--Records good. No regulation or diversion upstream from station.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,200 ft3/s, Feb. 16, 1927, gage height, 13.2 ft, from
floodmarks, site and datum then in use, on basis of slope-area measurement of peak flow; no flow many days in
most years.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 100 ft3/s or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Mar. 13 1515 73 5.89
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 .38 .76 .72 1.5 30 7.0 5.1 1.7 .37 .00 .00 .00
2 .34 .85 .83 1.5 16 6.6 5.1 1.6 .30 .00 .00 .00
3 .35 .76 .94 1.4 10 6.3 4.8 1.6 .25 .00 .00 .00
4 .36 .74 .94 1.4 6.8 5.9 4.5 1.5 .23 .00 .00 .00
5 .36 .93 1.0 1.5 5.2 10 4.2 1.4 .19 .00 .00 .00
6 .40 .88 1.0 1.7 4.6 11 3.9 1.4 .16 .00 .00 .00
7 .40 .53 .93 1.6 4.1 7.8 3.6 1.4 .15 .00 .00 .00
8 .44 .52 .96 1.6 3.6 6.5 3.4 1.3 .12 .00 .00 .00
9 .43 .48 .97 1.6 3.3 5.8 3.3 1.3 .09 .00 .00 .00
10 .37 .53 .97 1.5 3.1 5.3 3.4 1.2 .08 .00 .00 .00
11 .36 .51 .97 1.5 3.0 5.1 3.4 1.1 .08 .00 .00 .00
12 .41 .51 1.0 1.4 3.0 5.6 3.2 1.0 .08 .00 .00 .00
13 .34 .51 1.3 1.3 3.1 37 3.1 .90 .07 .00 .00 .00
14 .36 .52 1.3 1.3 3.0 30 2.9 .85 .06 .00 .00 .00
15 .37 .64 1.3 1.3 3.0 18 2.8 .84 .06 .00 .00 .00
16 .41 .68 1.3 1.4 2.9 14 2.6 .87 .05 .00 .00 .00
17 .42 .74 1.2 1.8 2.9 11 2.9 .84 .04 .00 .00 .00
18 .43 .75 1.0 1.8 2.9 9.7 4.8 .73 .03 .00 .00 .00
19 .49 .81 1.0 2.1 3.0 8.6 4.5 .69 .03 .00 .00 .00
20 .46 .71 1.1 2.1 3.0 7.7 3.7 .66 .02 .00 .00 .00
21 .52 .68 1.1 2.5 3.3 6.9 3.4 .62 .02 .00 .00 .00
22 .55 .77 1.2 4.8 3.7 6.4 3.2 .65 .03 .00 .00 .00
23 .47 .67 1.3 4.0 3.1 6.0 2.9 .72 .04 .00 .00 .00
24 .44 .79 1.5 3.0 2.8 5.7 2.6 .83 .04 .00 .00 .00
25 .47 .78 1.4 3.1 5.9 5.9 2.5 .91 e.05 .00 .00 .00
26 .52 .85 1.4 3.2 9.7 5.7 2.3 .86 .06 .00 .00 .00
27 .55 .91 1.3 2.9 8.1 5.5 2.2 .72 .06 .00 .00 .00
28 .58 .94 1.3 3.0 9.3 6.0 2.1 .59 .04 .00 .00 .00
29 .57 .79 1.2 2.9 7.9 6.5 1.7 .54 .01 .00 .00 .00
30 .58 .70 1.8 2.6 --- 5.7 1.7 .50 e.00 .00 .00 .00
31 .62 --- 1.4 4.1 --- 5.3 --- .49 --- .00 .00 ---
TOTAL 13.75 21.24 35.63 67.4 170.3 284.5 99.8 30.31 2.81 0.00 0.00 0.00
MEAN .44 .71 1.15 2.17 5.87 9.18 3.33 .98 .094 .000 .000 .000
MAX .62 .94 1.8 4.8 30 37 5.1 1.7 .37 .00 .00 .00
MIN .34 .48 .72 1.3 2.8 5.1 1.7 .49 .00 .00 .00 .00
AC-FT 27 42 71 134 338 564 198 60 5.6 .00 .00 .00
e Estimated.
11015000 SWEETWATER RIVER NEAR DESCANSO, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1957 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .21 1.57 5.00 13.7 29.0 40.1 18.5 7.51 2.85 .80 .46 .33
MAX 3.53 24.0 83.5 304 336 382 138 68.5 25.5 8.68 8.45 6.16
(WY) 1984 1966 1967 1993 1980 1983 1983 1983 1983 1980 1983 1978
MIN .000 .000 .000 .000 .000 .042 .010 .000 .000 .000 .000 .000
(WY) 1957 1957 1957 1961 1961 1961 1961 1961 1959 1957 1957 1957
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1957 - 1996
ANNUAL TOTAL 15508.53 725.74
ANNUAL MEAN 42.5 1.98 9.90
HIGHEST ANNUAL MEAN 71.2 1983
LOWEST ANNUAL MEAN .004 1961
HIGHEST DAILY MEAN 2460 Mar 5 37 Mar 13 2500 Feb 20 1980
LOWEST DAILY MEAN .34 Oct 2 .00 Jun 30 .00 Oct 1 1956
ANNUAL SEVEN-DAY MINIMUM .36 Sep 19 .00 Jun 30 .00 Oct 1 1956
INSTANTANEOUS PEAK FLOW 73 Mar 13 8600 Mar 5 1995
INSTANTANEOUS PEAK STAGE 5.89 Mar 13 13.22 Mar 5 1995
ANNUAL RUNOFF (AC-FT) 30760 1440 7170
10 PERCENT EXCEEDS 67 5.5 13
50 PERCENT EXCEEDS 6.9 .76 .31
90 PERCENT EXCEEDS .46 .00 .00
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