11022200  LOS COCHES CREEK NEAR LAKESIDE, CA

LOCATION.--Lat 32°50'10", long 116°53'58", in Mission San Diego Grant, San Diego County, Hydrologic Unit
   18070304, on upstream right bank side of bridge on Old Highway 8, 2.7 mi upstream from mouth, and 1.9 mi
   southeast of Lakeside.

DRAINAGE AREA.--12.2 mi2.

PERIOD OF RECORD.--October 1983 to current year.

REVISED RECORDS.--WDR CA-86-1:  Drainage area.

GAGE.--Water-stage recorder.  Elevation of gage is 560 ft above sea level, from topographic map.

REMARKS.--Records fair except for estimated daily discharges, which are poor.  No regulation or diversion
   upstream from station.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,090 ft3/s, Mar. 5, 1995, gage height, 9.74 ft; minimum
   daily, 0.06 ft3/s, Aug. 25-26, Aug. 30-Sept. 1, and Sept. 10, 1996.

EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 75 ft3/s, or maximum, from rating
   curve extended above 209 ft3/s on basis of critical-depth computations:

                         Discharge       Gage height                                  Discharge       Gage height
 Date         Time        (ft3/s)           (ft)              Date         Time        (ft3/s)           (ft)

Jan. 31       2300          331             6.55             Mar.  5       0030           77             4.01
Feb. 25       1130          114             4.50             Mar. 13       0600          372             6.81


                  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       .39     1.7       .62     e.93    35         1.8     2.2       .49      .25      .10      .08      .06
  2       .38     1.1       .62     e.90     4.0       1.7     1.9       .47      .24      .10      .09      .07
  3       .35      .72      .66     e.90     2.2       1.7     1.5       .47      .19      .11      .09      .07
  4       .34      .62      .66     e.88     1.7       1.6     1.5       .48      .20      .10      .09      .07
  5       .33      .61      .64    e1.0      1.5      13       1.3       .46      .19      .11      .09      .07

  6       .30      .56      .68     1.1      1.4       2.7     1.1       .42      .15      .09      .09      .07
  7       .30      .55      .68     1.0      1.3       2.2     1.1       .43      .18      .10      .09      .07
  8       .30      .52      .69     1.0      1.2       2.0     1.1       .47      .15      .10      .09      .08
  9       .32      .51      .68     1.0      1.1       1.8     1.2       .45      .12      .09      .09      .07
 10       .33      .53      .64     1.0      1.1       1.7     1.2       .43      .16      .11      .09      .06

 11       .33      .54      .64     1.0      1.0       1.5     1.2       .41      .17      .12      .09      .07
 12       .34      .53      .64     1.0      1.3      11       1.2       .37      .17      .12      .08      .07
 13       .35      .52      .84     1.0      1.0      96       1.2       .38      .17      .10      .08      .08
 14       .38      .54     1.1       .97      .91     11       1.1       .38      .16      .10      .07      .09
 15       .38      .57      .91     1.0       .88      4.6     1.0       .36      .16      .10      .07      .09

 16       .38      .56      .94     2.0       .87      3.7     1.2       .36      .17      .10      .07      .09
 17       .38      .58      .86     3.7       .90      3.4     1.6       .38      .15      .10      .08      .08
 18       .38      .57      .89     1.1       .92      3.1     9.8       .38      .15      .09      .10      .08
 19       .39      .55      .95     1.4       .87      2.7     1.6       .36      .14      .09      .09      .08
 20       .41      .53     4.1      1.1       .86      2.3     1.1       .36      .15      .09      .09      .07

 21       .42      .51     1.4      5.8      2.3       2.3      .96      .34      .15      .10      .08      .08
 22       .46      .55     1.1     11        2.5       2.2      .87      .34      .15      .08      .07      .08
 23       .46      .58     3.6      2.5      1.3       2.2      .75      .36      .16      .08      .07      .07
 24       .41      .57     1.5      1.8      1.3       2.6      .64      .38      .16      .08      .07      .08
 25       .38      .56    e1.4      2.3     22         2.4      .61      .37      .12      .10      .06      .08

 26       .38      .55    e1.2      2.0     11         2.5      .55      .40      .12      .09      .06      .10
 27       .38      .59    e1.1      1.4      4.0       2.4      .55      .31      .11      .09      .07      .10
 28       .38      .54    e1.1      1.7      7.6       3.7      .53      .25      .12      .09      .07      .08
 29       .41      .56    e1.0      1.4      2.0       2.8      .51      .25      .12      .08      .07      .07
 30       .43      .62    e1.0      1.4       ---      2.1      .51      .26      .11      .08      .06      .08
 31       .48      ---     e.96    27         ---      2.2      ---      .26      ---      .08      .06      ---

TOTAL   11.65    18.54    33.80    82.28   114.01    196.9    41.58    11.83     4.74     2.97     2.45     2.31
MEAN      .38      .62     1.09     2.65     3.93     6.35     1.39      .38      .16     .096     .079     .077
MAX       .48      1.7      4.1       27       35       96      9.8      .49      .25      .12      .10      .10
MIN       .30      .51      .62      .88      .86      1.5      .51      .25      .11      .08      .06      .06
AC-FT      23       37       67      163      226      391       82       23      9.4      5.9      4.9      4.6

  e Estimated.


                             11022200  LOS COCHES CREEK NEAR LAKESIDE, CA--Continued

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1984 - 1996, BY WATER YEAR (WY)

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

MEAN      .49     1.25     1.95     5.44     5.15     6.55     2.40     1.25      .72      .37      .25      .26
MAX      1.37     4.58     6.09     40.2     25.7     31.1     10.2     5.86     3.67     1.31      .54      .49
(WY)     1988     1984     1985     1993     1993     1995     1995     1995     1995     1995     1995     1986
MIN       .14      .16      .32      .66     1.09      .78      .45      .25      .16     .096     .079     .077
(WY)     1995     1993     1990     1989     1989     1989     1989     1984     1996     1996     1996     1996

SUMMARY STATISTICS           FOR 1995 CALENDAR YEAR        FOR 1996 WATER YEAR           WATER YEARS 1984 - 1996

ANNUAL TOTAL                        2334.22                     523.06
ANNUAL MEAN                            6.40                       1.43                       2.16
HIGHEST ANNUAL MEAN                                                                          6.77           1993
LOWEST ANNUAL MEAN                                                                            .50           1989
HIGHEST DAILY MEAN                   248     Mar  5              96     Mar 13             248       Mar  5 1995
LOWEST DAILY MEAN                       .30  Oct  6                .06  Aug 25                .06    Aug 25 1996
ANNUAL SEVEN-DAY MINIMUM                .32  Oct  5                .06  Aug 25                .06    Aug 25 1996
INSTANTANEOUS PEAK FLOW                                         372     Mar 13            1090       Mar  5 1995
INSTANTANEOUS PEAK STAGE                                          6.81  Mar 13               9.74    Mar  5 1995
ANNUAL RUNOFF (AC-FT)               4630                       1040                       1570
10 PERCENT EXCEEDS                    14                          2.2                        3.2
50 PERCENT EXCEEDS                     1.9                         .49                        .54
90 PERCENT EXCEEDS                      .43                        .08                        .18