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 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 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 71 53 85 79 77 86 87 78 59 72 71 71
2 64 114 84 73 77 78 95 87 58 78 69 83
3 65 63 81 70 83 82 88 67 65 72 67 88
4 65 51 77 67 85 86 83 71 63 69 69 78
5 74 53 74 67 93 72 72 80 65 71 71 88
6 78 55 79 49 99 71 74 76 63 73 72 90
7 76 48 70 52 100 76 67 86 83 62 77 74
8 91 50 63 61 95 79 64 81 83 80 101 58
9 75 64 61 43 94 90 72 74 79 94 104 57
10 83 58 48 70 75 90 70 71 96 91 90 61
11 87 71 51 76 61 86 78 83 83 90 83 66
12 91 63 61 80 82 76 70 83 77 88 74 64
13 76 68 64 77 85 70 79 71 78 84 71 64
14 72 80 78 71 94 77 90 65 78 90 77 70
15 71 88 88 74 80 82 65 66 76 79 69 69
16 73 88 91 76 60 85 62 72 94 78 63 85
17 63 76 78 75 50 97 65 69 98 80 59 75
18 70 72 84 70 63 80 67 62 95 82 54 66
19 73 77 87 69 63 72 69 60 92 85 57 67
20 83 65 90 63 59 70 68 68 102 78 62 67
21 80 65 69 65 63 75 65 78 84 69 61 62
22 72 73 72 57 80 66 63 69 78 67 66 57
23 79 88 86 61 86 68 64 71 80 68 65 80
24 89 81 91 67 83 72 80 65 80 74 75 66
25 83 79 79 65 78 71 80 51 76 104 69 67
26 72 93 78 62 87 82 66 64 71 79 85 72
27 72 83 76 65 75 96 66 58 71 85 87 67
28 71 86 77 69 72 102 68 54 63 92 98 59
29 64 85 77 88 --- 90 78 56 68 96 81 51
30 63 88 80 84 --- 75 63 78 62 88 86 51
31 52 --- 80 84 --- 71 --- 69 --- 79 70 ---
TOTAL 2298 2178 2359 2129 2199 2473 2178 2183 2320 2497 2303 2073
MEAN 74.1 72.6 76.1 68.7 78.5 79.8 72.6 70.4 77.3 80.5 74.3 69.1
MAX 91 114 91 88 100 102 95 87 102 104 104 90
MIN 52 48 48 43 50 66 62 51 58 62 54 51
AC-FT 4560 4320 4680 4220 4360 4910 4320 4330 4600 4950 4570 4110
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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