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                                   Cheney Lake
                          MONTHLY LAKE REPORT
                                 MAY 03


    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 1422.38   174621
 1  1422.40 1422.22   173044      0      981   0.470     400   0.74  0.13
 2  1422.20 1422.15   172354      0      679   0.100     300   0.00  0.00
 3  1422.12 1422.05   171368      0      491   0.170     250   0.00  0.00
 4  1422.03 1422.05   171368      0      490   0.120     225   0.00  0.02
 5  1421.95 1421.92   170115      0      490   0.460     200   0.00  0.00

 6  1421.88 1421.85   169449      0      403   0.280     175   0.00  0.00
 7  1421.83 1421.79   168880      0      244   0.190     150   0.00  0.00
 8  1421.78 1421.78   168785      0      244   0.260     130   0.00  0.01
 9  1421.71 1421.72   168214      0      173   0.400     120   0.00  0.00
10  1421.70 1421.72   168214      0      129   0.240     110   0.00  0.02

11  1421.71 1421.64   167454      0      129   0.260     100   0.00  0.00
12  1421.63 1421.60   167074      0      129   0.240     100   0.00  0.00
13  1421.60 1421.59   166979      0       43   0.460     100   0.00  0.12
14  1421.63 1421.62   167264      0        0   0.140     250   0.21  0.03
15  1421.61 1421.63   167359      0        0   0.210     150   0.00  0.05

16  1421.72 1421.79   168880      0        0   0.220     850   0.84  1.32
17  1421.81 1421.85   169449      0        0   0.080     400   0.02  0.03
18  1421.84 1421.86   169545      0        0   0.170     200   0.00  0.00
19  1421.91 1422.00   170875      0        0   0.320     400   0.59  0.03
20  1421.98 1421.91   170020      0      143   0.140     200   0.10  0.04

21  1421.90 1421.89   169830      0      245   0.210     225   0.00  0.00
22  1421.88 1421.84   169354      0      245   0.230     135   0.00  0.00
23  1421.90 1421.85   169449      0      245   0.280     475   0.32  0.32
24  1422.06 1422.19   172748      0      245   0.440    2000   1.27  1.01
25  1422.25 1422.32   174029      0      245   0.250    1000   0.02  0.04

26  1422.35 1422.36   174424      0      246   0.230     575   0.00  0.00
27  1422.36 1422.31   173932      0      399   0.210     325   0.00  0.00
28  1422.30 1422.25   173340      0      491   0.300     275   0.00  0.00
29  1422.24 1422.16   172453      0      491   0.270     225   0.00  0.00
30  1422.15 1422.09   171762      0      491   0.380     200   0.00  0.00
31  1422.06 1421.97   170590      0      490   0.410     175   0.00  0.01

TOTAL                             0     8601   8.140   10420   4.11  3.18
AVERAGE  1421.93                  0      277             336 NORMAL= 3.91

MAXIMUM  1422.40      174819   DATE= 1    TOP CONSERVATION POOL   1421.60
MINIMUM  1421.58      166884   DATE=13    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   3182 AC-FT

                      INFLOW VOLUME=    20668 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION