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                                     Cheney Lake
                          MONTHLY LAKE REPORT
                                 SEP 09


    POOL ELEVATIONS  STORAGE     RELEASES       EVAP  INFLOW   RAINFALL
DAY      FT-NGVD     2400HR         DSF        INCHES   ADJ     INCHES
      0800    2400    AC-FT   POWER    TOTAL  8A TO 8A  DSF    7A TO  7A
                                                               DAM   BSN
PRIOR MONTH 1420.93   160733
 1  1420.93 1420.89   160367      0        0   0.220       5   0.00  0.00
 2  1420.89 1420.88   160275      0        0   0.250      20   0.00  0.00
 3  1420.88 1420.88   160275      0        0   0.190     100   0.00  0.00
 4  1420.86 1420.88   160275      0        0   0.190     100   1.36  0.32
 5  1420.89 1420.88   160275      0        0   0.270      50   0.00  0.01

 6  1420.87 1420.85   160000      0        0   0.030      20   0.00  0.00
 7  1420.86 1420.82   159725      0        0   0.170      20   0.00  0.00
 8  1420.98 1421.38   164984      0        0   0.150    2700   1.65  0.47
 9  1421.58 1421.72   168214      0        0   0.050    1700   5.23  2.01
10  1421.79 1421.89   169830      0        0   0.080     900   0.02  0.01

11  1421.90 1421.96   170495      0        0   0.130     400   0.00  0.00
12  1422.00 1422.05   171368      0        0   0.100     500   0.33  0.56
13  1422.12 1422.29   173735      0        0   0.110    1300   0.00  0.40
14  1422.33 1422.37   174523      0        0   0.110     500   0.00  0.00
15  1422.39 1422.42   175016      0        0   0.050     350   0.00  0.00

16  1422.42 1422.43   175115      0        0   0.170     200   0.04  0.00
17  1422.44 1422.43   175115      0        0   0.310     170   0.00  0.00
18  1422.45 1422.44   175212      0        0   0.110     130   0.00  0.00
19  1422.45 1422.44   175212      0        0   0.280     100   0.00  0.00
20  1422.45 1422.45   175311      0        0   0.210     170   0.12  0.03

21  1422.47 1422.52   176002      0        0   0.210     150   0.06  0.05
22  1422.50 1422.47   175508      0        0   0.140     100   0.30  0.06
23  1422.48 1422.47   175508      0        0   0.060      50   0.03  0.01
24  1422.47 1422.47   175508      0        0   0.050     100   0.00  0.00
25  1422.47 1422.42   175016      0      337   0.140     200   0.00  0.00

26  1422.39 1422.28   173636      0      738   0.160     150   0.17  0.64
27  1422.24 1422.18   172650      0      737   0.140     200   0.00  0.00
28  1422.13 1422.05   171368      0      518   0.080      90   0.00  0.00
29  1422.04 1421.99   170780      0      245   0.290      50   0.00  0.00
30  1421.96 1421.91   170020      0      245   0.180      25   0.00  0.00

TOTAL                             0     2820   4.630   10550   9.31  4.57
AVERAGE  1421.90                  0       94             352 NORMAL= 2.83

MAXIMUM  1422.57      176494   DATE=21    TOP CONSERVATION POOL   1421.60
MINIMUM  1420.82      159725   DATE= 7    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   3482 AC-FT

                      INFLOW VOLUME=    20926 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION