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                                   Cheney Lake
                          MONTHLY LAKE REPORT
                                 MAY 99


    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 1421.74   168404
 1  1421.74 1421.70   168024      0      489   0.240     450   0.00  0.00
 2  1421.62 1421.61   167169      0      488   0.360     150   0.10  0.20
 3  1421.63 1421.58   166884      0      330   0.200     350   0.00  0.05
 4  1421.53 1421.49   166029      0       84   0.350     200   0.20  0.01
 5  1421.44 1421.28   164034      0        0   0.300     100   0.00  0.03

 6  1421.34 1421.24   163653      0        0   0.230      20   0.43  0.02
 7  1421.24 1421.67   167740      0        0   0.300     700   0.00  0.00
 8  1421.68 1421.67   167740      0        0   0.290     400   0.00  0.00
 9  1421.67 1421.75   168500      0        0   0.340     150   0.00  0.00
10  1421.66 1421.69   167929      0        0   0.370      50   0.00  0.00

11  1421.74 1421.72   168214      0        0   0.280     150   0.05  0.55
12  1421.72 1421.70   168024      0        0   0.170      50   0.11  0.00
13  1421.69 1421.67   167740      0        0   0.260      20   0.00  0.00
14  1421.66 1421.66   167645      0        0   0.300     100   0.00  0.00
15  1421.68 1421.68   167835      0        0   0.230     200   0.00  0.00

16  1421.68 1421.80   168975      0        0   0.250     700   0.00  0.00
17  1421.84 1421.86   169545      0        0   0.250     400   3.74  0.35
18  1421.86 1421.85   169449      0        0   0.220      30   0.00  0.01
19  1421.84 1421.80   168975      0      160   0.260      30   0.00  0.00
20  1421.81 1421.91   170020      0      244   0.380     900   0.00  0.00

21  1421.87 1421.86   169545      0      245   0.380      50   1.70  0.61
22  1421.85 1421.83   169259      0      244   0.220     200   0.02  0.00
23  1421.93 1421.89   169830      0      245   0.270     650   0.63  0.50
24  1421.88 1421.86   169545      0      245   0.290     250   0.00  0.00
25  1421.86 1421.82   169164      0      244   0.270     200   0.00  0.10

26  1421.81 1421.75   168500      0      400   0.180     150   0.03  0.00
27  1421.73 1421.65   167550      0      489   0.220     150   0.00  0.00
28  1421.63 1421.58   166884      0      201   0.330     100   0.00  0.00
29  1421.59 1421.58   166884      0        0   0.270      50   0.00  0.00
30  1421.57 1421.55   166600      0        0   0.230      50   0.00  0.00
31  1421.62 1421.55   166600      0        0   0.420     150   0.42  0.37

TOTAL                             0     4108   8.660    7150   7.43  2.80
AVERAGE  1421.69                  0      133             231 NORMAL= 3.91

MAXIMUM  1421.95      170399   DATE=23    TOP CONSERVATION POOL   1421.60
MINIMUM  1421.24      163653   DATE= 7    TOP FLOOD POOL          1429.00

                      INFLOW VOLUME=    14182 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION