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                                   Cheney Lake
                          MONTHLY LAKE REPORT
                                 MAY 11


    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 1421.56   166695
 1  1421.55 1421.54   166504      0        0   0.340      70   0.00  0.00
 2  1421.54 1421.55   166600      0        0   0.160      70   0.00  0.00
 3  1421.54 1421.50   166124      0        0   0.140      70   0.00  0.00
 4  1421.49 1421.48   165934      0        0   0.230      70   0.00  0.00
 5  1421.49 1421.49   166029      0        0   0.520      70   0.00  0.00

 6  1421.47 1421.45   165648      0        0   0.220      30   0.00  0.00
 7  1421.47 1421.45   165648      0        0   0.410      30   0.00  0.00
 8  1421.45 1421.42   165364      0        0   0.370      30   0.00  0.00
 9  1421.44 1421.41   165269      0        0   0.300      30   0.00  0.00
10  1421.42 1421.42   165364      0        0   0.530      30   0.00  0.00

11  1421.42 1421.38   164984      0        0   0.390      30   0.00  0.00
12  1421.42 1421.42   165364      0        0   0.140     300   0.02  0.01
13  1421.48 1421.44   165553      0        0   0.380      90   0.00  0.00
14  1421.41 1421.34   164603      0        0   0.200      30   0.00  0.00
15  1421.39 1421.32   164413      0        0   0.250      30   0.00  0.00

16  1421.32 1421.28   164034      0        0   0.230      30   0.00  0.00
17  1421.28 1421.24   163653      0        0   0.280       0   0.00  0.00
18  1421.26 1421.27   163939      0        0   0.400     215   0.15  0.02
19  1421.28 1421.28   164034      0        0   0.060     140   0.09  0.01
20  1421.36 1421.33   164508      0        0   0.130     300   0.35  0.33

21  1421.32 1421.30   164224      0        0   0.180      10   0.13  0.25
22  1421.32 1421.32   164413      0        0   0.350     200   0.00  0.00
23  1421.30 1421.31   164319      0        0   0.320      10   0.00  0.00
24  1421.32 1421.45   165648      0        0   0.320     400   0.00  0.00
25  1421.39 1421.39   165079      0        0   0.230     100   0.37  0.29

26  1421.40 1421.33   164508      0        0   0.170      80   0.00  0.01
27  1421.30 1421.33   164508      0        0   0.280      40   0.00  0.00
28  1421.34 1421.33   164508      0        0   0.200      20   0.09  0.01
29  1421.30 1421.27   163939      0        0   0.080      10   0.00  0.00
30  1421.27 1421.21   163368      0        0   0.530      10   0.00  0.00
31  1421.37 1421.35   164698      0        0   0.370     200   0.31  0.28

TOTAL                             0        0   8.710    2745   1.51  1.21
AVERAGE  1421.37                  0        0              89 NORMAL= 3.91

MAXIMUM  1421.56      166695   DATE= 1    TOP CONSERVATION POOL   1421.60
MINIMUM  1421.18      163084   DATE=30    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   3855 AC-FT

                      INFLOW VOLUME=     5445 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION