11390000 BUTTE CREEK NEAR CHICO, CA. Continued

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1931 - 2000, BY WATER YEAR (WY)

         OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
MEAN     138      227      457      695      826      771      681      504      287      166      133      119
MAX      775     1269     2061     2847     2925     2601     1848     1314      773      356      223      183
(WY)    1963     1974     1956     1997     1986     1995     1982     1995     1998     1998     1975     1998
MIN     65.8     77.8     89.5     91.0      114      123      114      134     79.4     54.4     46.1     51.9
(WY)    1992     1992     1991     1991     1977     1977     1977     1977     1977     1977     1931     1992

SUMMARY STATISTICS         FOR 1999 CALENDAR YEAR          FOR 2000 WATER YEAR          WATER YEARS 1931 - 2000
ANNUAL TOTAL                               159043                       159399
ANNUAL MEAN                                   436                          436                              415
HIGHEST ANNUAL MEAN                                                                                   834  1995
LOWEST ANNUAL MEAN                                                                                   94.0  1977
HIGHEST DAILY MEAN                     4960 Feb 9                  5090 Feb 14                26600 Jan 1  1997
LOWEST DAILY MEAN                      113 Oct 14                   109 Sep 21                  44 Aug 23  1931
ANNUAL SEVEN-DAY MINIMUM               114 Oct 14                   113 Sep 24                  44 Aug 23  1931
INSTANTANEOUS PEAK FLOW                                            7510 Feb 14                35600 Jan 1  1997
INSTANTANEOUS PEAK STAGE                                           6.61 Feb 14               17.52 Feb 17  1986
ANNUAL RUNOFF (AC-FT)                      315500                       316200                           300700
10 PERCENT EXCEEDS                            898                          942                              863
50 PERCENT EXCEEDS                            242                          217                              210
90 PERCENT EXCEEDS                            129                          126                              102