10254670  ALAMO RIVER AT DROP NO. 3, NEAR CALIPATRIA, CA

LOCATION.--Lat 33°06'16", long 115°32'39", on line between secs.19 and 20, T.12 S., R.14 E., Imperial County,
   Hydrologic Unit 18100200, on right bank 2.2 mi southwest of Calipatria.

PERIOD OF RECORD.--October 1979 to current year.  Records prior to October 1979 in files of the Imperial
   Irrigation District.
 	CHEMICAL DATA:  Water years 1969-70, 1975-77, 1979-94.
	BIOLOGICAL DATA:  Water years 1979-81.
	SPECIFIC CONDUCTANCE:  Water years 1969-70, 1975-77, 1979-84.
	WATER TEMPERATURE:  Water years 1969-70, 1975-77, 1979-84.
	SEDIMENT DATA:  Water years 1979-94.

REVISED RECORDS.--WDR CA-95-1:  1993(M).

GAGE.--Water-stage recorder and broad-crested weir.  Elevation of gage is 185 ft below sea level, from
   topographic map.

REMARKS.--Records good.  Flow is mainly return from irrigated areas.  See schematic diagram of Salton Sea basin.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 5,980 ft3/s, Mar. 27, 1992, gage height, 6.56 ft, from rating
   curve extended above 1,000 ft3/s; maximum gage height, 7.20 ft, Jan. 17, 1993 (affected by backwater); minimum
   daily, 259 ft3/s, Jan. 2, 1985.


                  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       801      658      612      463      640      780      911      922      745      714      715      664
  2       792      669      614      391      629      756      875      912      727      689      698      642
  3       788      668      600      477      611      701      909      915      753      708      677      655
  4       781      663      578      602      608      667      897      965      758      691      690      651
  5       746      674      603      622      599      679      890      890      744      716      660      625

  6       787      646      613      614      590      688      914      806      738      734      657      670
  7       750      646      614      642      605      741      941      842      747      726      673      660
  8       759      656      636      574      653      779      863      818      747      722      686      675
  9       721      671      623      590      671      826      852      787      749      716      721      649
 10       682      678      605      615      676      859      882      819      747      718      670      638

 11       697      683      561      596      668      886      885      832      744      762      670      622
 12       720      667      521      620      665      963      877      803      719      749      670      657
 13       733      655      551      628      667      893      905      766      718      795      650      655
 14       745      639      596      616      652      888      908      715      749      728      674      655
 15       751      652      615      566      625      925      922      742      779      711      698      670

 16       735      645      573      614      614      901      909      758      731      681      695      655
 17       726      661      553      597      627      890      949      745      714      668      703      658
 18       731      663      525      630      627      819     1020      757      749      649      718      673
 19       721      667      516      651      645      771      951      752      762      685      710      665
 20       729      658      569      648      631      807      969      738      742      709      662      685

 21       703      659      594      634      634      853      940      720      712      714      660      732
 22       668      648      590      604      655      869      895      721      723      723      677      792
 23       652      667      616      590      661      897      933      713      697      750      680      790
 24       670      596      626      624      667      959      989      735      671      749      685      760
 25       682      603      468      630      720      957      973      778      669      725      664      795

 26       658      610      360      686      761      915      963      735      686      728      648      765
 27       664      594      436      667      789      902     1040      706      683      753      667      776
 28       693      533      541      629      846      903     1050      724      666      745      677      799
 29       690      559      567      571      797      875     1020      730      709      725      680      795
 30       669      605      572      576      ---      875      938      741      700      733      682      778
 31       666      ---      568      605      ---      928      ---      746      ---      735      682      ---

TOTAL   22310    19293    17616    18572    19233    26152    27970    24333    21778    22351    21099    20906
MEAN      720      643      568      599      663      844      932      785      726      721      681      697
MAX       801      683      636      686      846      963     1050      965      779      795      721      799
MIN       652      533      360      391      590      667      852      706      666      649      648      622
AC-FT   44250    38270    34940    36840    38150    51870    55480    48260    43200    44330    41850    41470




                       10254670  ALAMO RIVER AT DROP NO. 3, NEAR CALIPATRIA, CA--Continued

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1980 - 1996, BY WATER YEAR (WY)

          OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

MEAN      785      668      546      521      602      820      963      841      698      691      707      727
MAX       895      809      666      640      718      947     1208     1000      888      888      846      847
(WY)     1992     1991     1991     1993     1991     1995     1994     1994     1994     1994     1994     1994
MIN       655      569      379      392      445      697      812      706      515      556      593      631
(WY)     1982     1982     1986     1995     1980     1987     1986     1982     1982     1982     1982     1986

SUMMARY STATISTICS           FOR 1995 CALENDAR YEAR        FOR 1996 WATER YEAR           WATER YEARS 1980 - 1996

ANNUAL TOTAL                      274035                     261613
ANNUAL MEAN                          751                        715                        714
HIGHEST ANNUAL MEAN                                                                        833              1994
LOWEST ANNUAL MEAN                                                                         628              1982
HIGHEST DAILY MEAN                  1400     Apr 19            1050     Apr 28            4670       Mar 27 1992
LOWEST DAILY MEAN                    330     Jan 30             360     Dec 26             259       Jan  2 1985
ANNUAL SEVEN-DAY MINIMUM             348     Jan 11             501     Dec 26             277       Dec 31 1984
INSTANTANEOUS PEAK FLOW                                        1120     Apr 18            5980       Mar 27 1992
INSTANTANEOUS PEAK STAGE                                          2.65  Apr 18           (a) 7.20    Jan 17 1993
ANNUAL RUNOFF (AC-FT)             543500                     518900                     517400
10 PERCENT EXCEEDS                   984                        896                        931
50 PERCENT EXCEEDS                   787                        692                        700
90 PERCENT EXCEEDS                   470                        600                        502

  (a) Affected by backwater.