10254730  ALAMO RIVER NEAR NILAND, CA

LOCATION.--Lat 33°11'56", long 115°35'46", in SW 1/4 NW 1/4 sec.23, T.11 S., R.13 E., Imperial County, Hydrologic
   Unit 18100200, on left bank 1.0 mi upstream from mouth and 4.5 mi southwest of Niland.

PERIOD OF RECORD.--January 1943 to September 1960 (monthly discharge only, published in WSP 1743), October 1960
   to current year.

GAGE.--Acoustic-velocity meter and water-stage recorder.  Elevation of gage is 220 ft below sea level, from
   topographic map.  Prior to Oct. 1, 1986, at site 0.4 mi downstream at different datum.

REMARKS.--Records good.  Discharge mainly represents seepage and return flow from irrigated areas.  See schematic
   diagram of Salton Sea basin.

COOPERATION.--Gage-height record provided by Imperial Irrigation District for the following dates:  Oct. 30, 31.

EXTREMES FOR PERIOD OF RECORD.--Maximum daily discharge, 4,500 ft3/s, Aug. 17, 1977, estimated by Imperial
   Irrigation District; minimum daily, 288 ft3/s, Jan. 2, 1966, Dec. 15, 1984.


                  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       936      810      677      543      740      948     1050     1100      870      804      864      810
  2       936      807      682      454      718      922     1050     1060      848      790      847      769
  3       936      812      666      533      680      818     1040     1080      870      814      812      757
  4       927      813      650      670      679      777     1050     1090      905      819      821      752
  5       851      778      654      688      668      778     1050     1060      889      856      773      694

  6       882      771      689      661      658      832     1070      948      858      855      766      774
  7       871      710      676      697      686      879     1090      948      869      875      812      782
  8       864      716      729      628      746      957     1040      948      890      866      814      824
  9       847      734      694      639      781     1000     1020      948      908      852      836      830
 10       791      784      644      692      783     1030     1060      966      890      869      811      769

 11       816      803      608      670      767     1070     1100      983      900      896      768      735
 12       840      778      568      694      758     1130     1080      957      889      885      800      798
 13       909      768      616      691      793     1100     1110      914      883      918      763      797
 14       918      732      662      670      760     1080     1090      855      918      887      816      782
 15       894      708      694      626      713     1100     1110      870      963      851      867      785

 16       871      732      663      665      665     1090     1080      870      909      875      874      765
 17       869      729      613      671      692     1070     1130      905      874      825      879      782
 18       864      773      586      699      677     1000     1160      905      909      799      863      815
 19       834      769      575      729      740      948     1120      887      909      814      868      805
 20       857      747      621      715      742      957     1110      896      884      845      819      834

 21       825      744      671      704      720      983     1120      879      848      849      827      901
 22       785      740      660      682      750      992     1100      857      873      861      824      939
 23       728      770      688      633      763     1040     1090      846      868      909      828      958
 24       749      687      692      683      760     1080     1120      879      850      897      809      976
 25       788      669      539      701      852     1100     1100      896      812      878      775      967

 26       752      671      409      774      896     1120     1090      868      857      893      764      958
 27       756      661      482      736      957     1080     1140      811      842      936      787      958
 28       817      623      591      673     1000     1100     1170      847      810      927      778      976
 29       819      638      642      625      983     1090     1160      860      850      854      824      976
 30       825      669      642      626      ---     1080     1120      879      830      835      819      926
 31       833      ---      626      659      ---     1080      ---      905      ---      875      839      ---

TOTAL   26190    22146    19609    20531    22127    31231    32820    28717    26275    26709    25347    25194
MEAN      845      738      633      662      763     1007     1094      926      876      862      818      840
MAX       936      813      729      774     1000     1130     1170     1100      963      936      879      976
MIN       728      623      409      454      658      777     1020      811      810      790      763      694
AC-FT   51950    43930    38890    40720    43890    61950    65100    56960    52120    52980    50280    49970




                                10254730  ALAMO RIVER NEAR NILAND, CA--Continued

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 1996, BY WATER YEAR (WY)

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

MEAN      948      760      639      638      760      973     1089      957      820      824      843      901
MAX      1159      851      792      834      970     1144     1272     1182      981     1027     1278     1271
(WY)     1964     1991     1973     1972     1964     1963     1980     1975     1963     1963     1977     1962
MIN       742      616      416      396      495      734      797      684      646      636      656      667
(WY)     1986     1966     1986     1978     1993     1987     1965     1964     1964     1985     1986     1992

SUMMARY STATISTICS           FOR 1995 CALENDAR YEAR        FOR 1996 WATER YEAR           WATER YEARS 1961 - 1996

ANNUAL TOTAL                      308620                     306896
ANNUAL MEAN                          846                        839                        846
HIGHEST ANNUAL MEAN                                                                        991              1963
LOWEST ANNUAL MEAN                                                                         680              1986
HIGHEST DAILY MEAN                  1260     Apr  2            1170     Apr 28            4500       Aug 17 1977
LOWEST DAILY MEAN                    362     Jan 15             409     Dec 26             288       Jan  2 1966
ANNUAL SEVEN-DAY MINIMUM             388     Jan 11             562     Dec 25             323       Dec 27 1965
ANNUAL RUNOFF (AC-FT)             612100                     608700                     613000
10 PERCENT EXCEEDS                  1150                       1080                       1110
50 PERCENT EXCEEDS                   869                        831                        838
90 PERCENT EXCEEDS                   541                        665                        601