11108134 CASTAIC CREEK RELEASE FLOW BELOW CASTAIC LAKE, NEAR CASTAIC, CA

LOCATION.-Lat 34°31'10", long 118°36'34", in NE 1/4 SE 1/4 sec.13, T.5 N., R.17 W., Los Angeles County, Hydrologic Unit 18070102, in outlet structure 
below Castaic Dam and 1.9 mi north of Castaic. 
DRAINAGE AREA.-138 mi2, excludes 18.1 mi2 noncontributing area in Elizabeth Canyon Creek Basin. 
PERIOD OF RECORD.-October 1994 to current year. Records for 1995 water year published as station 11108135. Records for station 11108135 for October 1976 to 
September 1978 and October 1988 to September 1994 are not equivalent at low flows due to evaporation and seepage. 
GAGE.-Flow meters on outlet pipes. Elevation of gage is 1,200 ft above sea level, from topographic map. 
REMARKS.-Flow regulated by Castaic Lake (station 11108133). See schematic diagram of Santa Clara River Basin. 
COOPERATION.-Records were collected by California Department of Water Resources, under general supervision of the U.S. Geological Survey, in connection with a 
Federal Energy Regulatory Commission project. 
EXTREMES FOR PERIOD OF RECORD.-Maximum daily discharge, 3080 ft3/s, Feb. 23,1998; no flow for many days each year. 
EXTREMES OUTSIDE PERIOD OF RECORD.-Maximum discharge, 7,670 ft3/s, Mar. 2, 1983, at station 11108135; no flow for many days in each year. 

                  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       .00      .00      .00      .00    15     1000      135         .00      .8        22     10        8  
  2       .00      .00      .00     5       75      522      200         .00      .8        22     10        8  
  3       .00      .00      .00     5     1700      250      200         .00      .8        22     10        8  
  4       .00      .00      .00     5      340      250      200         .00      .8        22     10        8  
  5       .00      .00      .00     5      200      250      200         .00      .8        22     10        8  
  6       .00      .00      .00     5      100      250      200         .00      .8        22     10        8  
  7       .00      .00      .00    20      400      250      200      112         .8        22     10        8  
  8       .00      .00      .00    20      100      250      304      200         .8        22     10        8  
  9       .00      .00      .00    20      100      250      300      200         .8        22     10        8  
 10       .00      .00      .00    70      100      200      200      200         .8        22     10        8  
 
 11       .00      .00   105       70      100      150      100      200         .8        22     10        8  
 12       .00      .00    10       70      100      150       63      200         .8        22     10        8  
 13       .00      .00    10       70       32      150         .00   200         .8        22     10        8  
 14       .00      .00     5       70         .00   100         .00   200         .8        22      5        8  
 15       .00      .00     5       15         .00      .00      .00   200         .8        22      5        8  
 16       .00      .00     5       10         .00      .00      .00   200         .8        22      5        8  
 17       .00      .00     5       10         .00      .00      .00   200         .8        22      5        8  
 18       .00      .00     5       10         .00      .00      .00   200         .8        22      5        8  
 19       .00      .00     5        8         .00      .00      .00   200         .8        22      5        8  
 20       .00      .00     2        5         .00      .00      .00   200         .8        22      5        8  
 
 21       .00      .00      .00     5         .00      .00      .00   200         .8        22      5        8  
 22       .00      .00      .00     5         .00      .00      .00   200         .8        22      5        8  
 23       .00      .00      .00     5     3080         .00      .00   200         .8        23      5        8  
 24       .00      .00      .00     5     1680         .00      .00   200         .8        23      5        8  
 25       .00      .00      .00     5      865      200         .00   200         .8        23      5        7  
 26       .00      .00      .00    10      210      200         .00   100         .8        23      5        7  
 27       .00      .00      .00    10      335      400         .00      .00      .8        23      5        7  
 28       .00      .00      .00    10      325      200         .00      .00      .8        23      5        7  
 29       .00      .00      .00    10         ---   200         .00      .00      .7        23      5        7  
 30       .00      .00      .00    25         ---   100         .00      .00      .7        23      5        7  
 31       .00      ---      .00    15         ---    97         ---      .00      ---       23      5        ---
 
TOTAL    0.00     0.00   157.00   598.00  9857.00  5419.00  2302.00  3812.00     23.8      691      220      234
MEAN     .000     .000     5.06     19.3      352      175     76.7      123      .79     22.3     7.10     7.80
MAX       .00      .00      105       70     3080     1000      304      200      .80       23       10      8.0
MIN       .00      .00      .00      .00      .00      .00      .00      .00      .70       22      5.0      7.0
AC-FT     .00      .00      311     1190    19550    10750     4570     7560       47     1370      436      464
 


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1995 - 1998, BY WATER YEAR (WY)                                 
  
DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
MEAN     .000     .000     1.27     4.82     87.2     79.2     43.2     33.5     7.21     14.1     9.25     1.95
MAX      .000     .000     5.06     19.3      352      175     81.4      123     28.0     34.2     29.9     7.80
(WY)     1995     1995     1998     1998     1998     1998     1996     1998     1995     1995     1995     1998
MIN      .000     .000     .000     .000     .000     .000     .000     .000     .000     .000     .000     .000
(WY)     1995     1995     1995     1995     1995     1995     1995     1995     1996     1996     1996     1995
 
SUMMARY STATISTICS           FOR 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1995 - 1998
 
ANNUAL TOTAL                        5002.00                   23313.80                                          
ANNUAL MEAN                           13.7                       63.9                       23.1                
HIGHEST ANNUAL MEAN                                                                         63.9            1998
LOWEST ANNUAL MEAN                                                                           7.60           1996
  HIGHEST DAILY MEAN                   300     Mar 22            3080     Feb 23            3080       Feb 23 1998
  LOWEST DAILY MEAN                       .00  Jan  1                .00  Oct  1                .00    Oct  1 1994
  ANNUAL SEVEN-DAY MINIMUM                .00  Jan  1                .00  Oct  1                .00    Oct  1 1994
ANNUAL RUNOFF (AC-FT)               9920                      46240                      16740                  
10 PERCENT EXCEEDS                     5.0                      200                         39                  
50 PERCENT EXCEEDS                      .00                       5.0                         .00               
90 PERCENT EXCEEDS                      .00                        .00                        .00