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 except for periods of May 9 to July 23 and Sept. 10-17, which are poor.  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: Nov. 28 to Dec. 2 and June 6 to July 21.
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 1997 TO SEPTEMBER 1998

                                               DAILY MEAN VALUES
DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
  1       667      935      724      563      771      855     1090     1130     1020      872     1000      729
  2       625      875      710      505      672      949     1080     1140     1090      864     1040      768
  3       616      829      696      549      674     1020     1150     1140     1140      921      974      802
  4       655      846      737      593      826     1020     1120     1130      988      896      910      840
  5       713      890      777      493      589     1020     1120     1110      954      921      919      832
  6       712      915      797      479      533      996     1050     1120     1010      880      928      808
  7       720      931      833      539      556     1020     1080     1100     1030      880      965      766
  8       728      860      630      589      538      935     1040     1120      929      938      983      725
  9       800      827      554      589      597      930     1060     1180      904      997      974      741
 10       892      791      568      596      468      901     1150     1200      946     1030      974      849
 
 11       891      826      629      642      450      915     1190     1200      988     1040      928      856
 12       898      818      635      556      496     1010     1140     1190      988      988      904      795
 13       970      783      676      568      543     1080     1020     1130      896      921      861      803
 14       960      806      685      608      529     1180     1020     1080      880      929      843      810
 15       946      791      658      594      629     1230     1110     1010      872      954      871      773
 16       979      764      658      587      546     1090     1160     1020      980      954      886      810
 17      1010      729      681      597      515      916     1180     1010      864      963      834      864
 18       929      772      751      605      475      845     1180      997      864      980      807      887
 19       892      804      742      591      423      841     1130      963      913      946      802      859
 20       858      809      682      636      410      919     1170     1020      921      872      816      843
 
 21       873      845      674      720      408     1010     1170     1110      921     e880      834      880
 22       928      780      771      722      438     1050     1180     1160      913     e920      879      907
 23       931      758      668      728      393     1060     1160     1170      888     e900      886      937
 24       915      719      553      769      424     1160     1190     1070      904      906      864      937
 25       930      732      480      779      461     1180     1170     1040      904      965      849      946
 26       998      777      399      752      565     1230     1130     1140      888      992      868      983
 27       970      762      417      754      733     1260     1110      980      833      974      880     1020
 28       920      663      451      830      784     1220     1100     1010      841     1000      878     1020
 29       907      625      480      858      ---     1200     1130     1020      841      983      888     1020
 30       930      644      548      869      ---     1090     1150      997      825      965      812      992
 31       948      ---      604      832      ---     1060      ---      980      ---      983      736      ---
 
TOTAL   26711    23906    19868    20092    15446    32192    33730    33667    27935    29214    27593    25802
MEAN      862      797      641      648      552     1038     1124     1086      931      942      890      860
MAX      1010      935      833      869      826     1260     1190     1200     1140     1040     1040     1020
MIN       616      625      399      479      393      841     1020      963      825      864      736      725
AC-FT   52980    47420    39410    39850    30640    63850    66900    66780    55410    57950    54730    51180


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 1998, BY WATER YEAR (WY)                                 
 
          OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
MEAN      945      761      641      639      756      976     1091      962      824      830      846      902
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 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1961 - 1998
 
ANNUAL TOTAL                      325907                     316156                                             
ANNUAL MEAN                          893                        866                        848                  
HIGHEST ANNUAL MEAN                                                                        991              1963
LOWEST ANNUAL MEAN                                                                         680              1986
  HIGHEST DAILY MEAN                  1720     Sep 25            1260     Mar 27            4500       Aug 17 1977
  LOWEST DAILY MEAN                    399     Dec 26             393     Feb 23             288       Jan  2 1966
  ANNUAL SEVEN-DAY MINIMUM             475     Dec 24             422     Feb 19             323       Dec 27 1965
ANNUAL RUNOFF (AC-FT)             646400                     627100                     614400                  
10 PERCENT EXCEEDS                  1110                       1130                       1110                  
50 PERCENT EXCEEDS                   907                        887                        841                  
90 PERCENT EXCEEDS                   658                        579                        606                  
 
   e Estimated.