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 through January and poor thereafter.  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 1997 TO SEPTEMBER 1998

                                               DAILY MEAN VALUES
DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
  1        78       51       56       60       87       75       80       72       73       57       71       71
  2        81       52       67       65       81       80       65       83       64       55       79       71
  3        81       75       59       58       84       76       64       72       67       61       71       83
  4        69       61       56       57      102       80       66       66       74       64       65      112
  5        64       49       56       60       86       73       78       71       66       65       62      121
  6        71       45       59       75       80       83       83       76       59       63       53      122
  7        56       45       65       81       82       76       79       79       59       61       53      103
  8        53       46       62       96       82       76       74       75       60       61       50       92
  9        55       61       60       83      163       77       79       74       59       61       57      100
 10        50       60       54       96      150       77       83       79       71       64       71       92
 
 11        50       61       59       93       84       64       91       76       64       90       60       77
 12        62       62       61       86       69       65       75       69       56       74       68       76
 13        59       68       54       82       73       70       74       81       59       78       66       75
 14        62       74       56       74      e76       75       65       87       60       67       73       76
 15        65       72       60       88      e85       86       66       94       60       59       79       80
 16        66       54       56       77      ---       73       68       85       56       68       68       85
 17        65       54       64       68     e120       64       71       75       55       61       66       83
 18        53       59       62       64      e82       56       69       70       51       61       61       91
 19        57       57       64       67       75       52       60       63       51       80       59       83
 20        59       57       63       59       73       61       73       65       43       79       58       86
 
 21        51       51       68       63       66       63       70       70       48       74       61       93
 22        54       53       73       64       67       54       85       68       55       70       47       99
 23        59       56       60       70       75       47       87       62       60       76       49       90
 24        59       65       61       66       76       55       91       62       50       76       71       65
 25        58       64       57       67       73       69       85       65       49       71       65       62
 26        59       54       52       63       82       66       78       55       52       75       52       66
 27        57       51       54       71       82       66       79       53       69       77       61       65
 28        50       52       54       85       82       64       67       64       55       78       64       60
 29        47       61       55       86      ---       62       69       70       52       71       62       60
 30        43       54       63       84      ---       57       69       58       56       73       67       64
 31        47      ---       57       80      ---       70      ---       78      ---       71       67      ---
 
TOTAL    1840     1724     1847     2288      ---     2112     2243     2217     1753     2141     1956     2503
MEAN     59.4     57.5     59.6     73.8      ---     68.1     74.8     71.5     58.4     69.1     63.1     83.4
MAX        81       75       73       96      ---       86       91       94       74       90       79      122
MIN        43       45       52       57      ---       47       60       53       43       55       47       60
AC-FT    3650     3420     3660     4540      ---     4190     4450     4400     3480     4250     3880     4960
 


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                  
    e  Estimated.