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 1996 TO SEPTEMBER 1997

                                               DAILY MEAN VALUES
DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

  1        71       77       68       73       75       89       75       73       53       56       74       61
  2        61       74       69       72       81       85       88       74       55       55       67       68
  3        65       99       68       71       78       82       93       71       50       54       71       74
  4        73      111       71       69       81       80       91       70       53       58       69       87
  5        70       87       72       76       80       80       89       75       60       57       65       87

  6        67       70       77       67       84       78       94       74       60       58       63       93
  7        66       74       77       59       82       83       91       72       64       56       64       84
  8        66       77       72       72       86       88       89       69       63       55       68       79
  9        63       82       89       73       83       84       88       62       57       57       73       84
 10        61       87       65       76       82       82       81       63       58       63       72       85

 11        62       78       61       82       83       84       76       69       56       59       71       92
 12        70       67       69       85       76       84       80       73       58       62       71       87
 13        64       79       74      103       71       83       79       67       57       64       73       82
 14        71       81       83      109       71       85       77       72       59       71       72       78
 15        61       88       82       81       70       91       73       71       62       73       79       91

 16        62       85       86       73       80       91       73       73       54       72       81       83
 17        71       80       79       71       74       84       68       64       56       81       86       76
 18        63       76       77       73       70       77       73       63      e62       69       93       69
 19        59       65       91       77       59       73       76       73       67       78       90       73
 20        62       75       88       73       69       80       75       64       66       80       84       72

 21        69       79       79       69       73       81       84       68       64       74       81       70
 22        69       70       82       66       80       92       83       71       57      111       73       59
 23        73       82       77       64       83       88       76       67       54      136       72       57
 24        72       79       74       68       73       90       76       64       49       96       70       53
 25        69       79       82       70       75       88       76       63       52       85       61      ---

 26        67       75       84       70       93       86       65       64       56       62       66      ---
 27        63       72       83       69       99       93       72       64       59       72       67      ---
 28        69       75       77       68       99       95       72       74       59       70       66      ---
 29        71       70       82       77      ---       90       66       68       63       65       69      177
 30        77       70       80       76      ---       89       66       62       55       62       68       86
 31        70      ---       73       77      ---       85      ---       55      ---       70       58      ---

TOTAL    2077     2363     2391     2309     2210     2640     2365     2112     1738     2181     2237      ---
MEAN     67.0     78.8     77.1     74.5     78.9     85.2     78.8     68.1     57.9     70.4     72.2      ---
MAX        77      111       91      109       99       95       94       75       67      136       93      ---
MIN        59       65       61       59       59       73       65       55       49       54       58      ---
AC-FT    4120     4690     4740     4580     4380     5240     4690     4190     3450     4330     4440      ---

    e  Estimated.


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