10259540 WHITEWATER RIVER NEAR MECCA, CA
LOCATION.--Lat 33°31'29", long 116°04'36", in NW 1/4 NW 1/4 sec.32, T.7 S., R.9 E., Riverside County, Hydrologic
Unit 18100200, on left bank 1.6 mi upstream from mouth at Salton Sea and 3.3 mi south of Mecca.
DRAINAGE AREA.--1,495 mi2.
PERIOD OF RECORD.--October 1960 to current year (since October 1992, low-flow records only).
GAGE.--Water-stage recorder. Datum of gage is 221.00 ft below sea level (levels by Coachella Valley Water
District). Oct. 1, 1960, to Mar. 22, 1967, at site 1.3 mi downstream and Mar. 23, 1967, to July 22, 1970, at
site 0.7 mi downstream at different datums.
REMARKS.--Records fair except for estimated daily discharges, which are poor. Most flow represents seepage and
return flow from irrigated areas. No discharge records computed above 200 ft3/s since October 1992. See
schematic diagram of Salton Sea basin.
EXTREMES FOR PERIOD OF RECORD.--Maximum daily discharge, 2,500 ft3/s (estimated), Jan. 25, 1969; minimum daily,
37 ft3/s, Nov. 25-29, 1960.
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 75 86 76 78 72 91 95 99 70 65 89 83
2 75 85 74 75 80 90 92 95 85 70 79 76
3 74 84 75 77 78 91 87 94 84 75 74 79
4 74 87 72 79 80 86 89 87 75 74 81 84
5 73 97 72 76 86 85 81 86 81 73 95 92
6 76 105 75 74 88 85 92 89 80 69 104 94
7 78 88 82 75 88 85 99 90 83 71 91 96
8 76 84 76 75 89 93 96 93 79 69 87 93
9 73 86 69 70 e92 105 89 99 78 70 86 90
10 72 82 73 70 e91 96 93 95 75 69 88 87
11 72 78 73 64 e90 88 96 91 70 72 84 86
12 73 80 71 70 e84 98 97 92 71 78 78 88
13 69 80 65 69 e82 98 93 90 77 70 80 87
14 61 79 59 68 e85 93 89 86 78 85 82 86
15 74 78 69 67 e82 85 89 84 82 85 84 85
16 75 78 72 71 e85 78 93 78 82 85 89 86
17 77 79 76 69 e87 78 88 88 70 84 89 78
18 78 81 77 69 e92 85 88 90 66 85 96 79
19 77 78 76 76 e88 85 87 100 66 88 89 80
20 76 77 80 76 e85 79 97 99 64 90 88 78
21 76 76 77 79 e87 84 97 91 65 87 97 81
22 79 75 80 83 e90 90 94 83 68 85 96 88
23 78 76 81 80 e92 89 84 84 68 82 87 85
24 82 73 82 79 e91 93 84 92 66 91 80 85
25 78 73 78 77 e91 88 89 87 63 93 84 83
26 82 77 71 74 e90 85 93 83 60 94 87 85
27 81 74 73 71 e88 82 93 80 62 98 78 79
28 81 77 85 77 e85 81 98 75 61 92 77 79
29 83 73 76 75 e85 82 89 71 64 93 80 83
30 82 73 75 72 --- 87 94 79 71 89 86 82
31 82 --- 80 73 --- 97 --- 76 --- 81 86 ---
TOTAL 2362 2419 2320 2288 2503 2732 2745 2726 2164 2512 2671 2537
MEAN 76.2 80.6 74.8 73.8 86.3 88.1 91.5 87.9 72.1 81.0 86.2 84.6
MAX 83 105 85 83 92 105 99 100 85 98 104 96
MIN 61 73 59 64 72 78 81 71 60 65 74 76
AC-FT 4690 4800 4600 4540 4960 5420 5440 5410 4290 4980 5300 5030
WTR YR 1996 TOTAL 29979 MEAN 81.9 MAX 105 MIN 59 AC-FT 59460
e Estimated.
10259540 WHITEWATER RIVER NEAR MECCA, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 1992, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 99.9 94.9 95.0 107 125 124 119 118 107 107 120 115
MAX 147 149 141 236 396 222 172 173 145 198 183 220
(WY) 1976 1966 1983 1969 1980 1978 1976 1976 1975 1979 1983 1976
MIN 53.9 44.4 45.4 51.4 56.6 71.8 77.9 80.7 66.9 57.4 80.3 74.1
(WY) 1961 1961 1961 1961 1961 1961 1961 1992 1987 1987 1992 1992
SUMMARY STATISTICS WATER YEARS 1961 - 1992
ANNUAL MEAN 111
HIGHEST ANNUAL MEAN 156 1976
LOWEST ANNUAL MEAN 68.4 1961
HIGHEST DAILY MEAN 2500 Jan 25 1969
LOWEST DAILY MEAN 37 Nov 25 1960
ANNUAL SEVEN-DAY MINIMUM 37 Nov 24 1960
ANNUAL RUNOFF (AC-FT) 80380
10 PERCENT EXCEEDS 140
50 PERCENT EXCEEDS 108
90 PERCENT EXCEEDS 76
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