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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 02


    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  761.79     7368
 1   761.79  761.79     7368      0       17   0.110      25   0.00  0.00
 2   761.79  761.74     7324      0       15   0.360      15   0.00  0.00
 3   761.74  761.74     7324      0       12   0.160      10   0.00  0.00
 4   761.74  761.73     7315      0       12   0.030      10   0.05  0.04
 5   761.73  761.70     7289      0       10   0.190      10   0.00  0.00

 6   761.70  761.71     7298      0        9   0.280      10   0.31  0.32
 7   761.71  761.70     7289      0        9   0.190      10   0.00  0.00
 8   761.70  761.70     7289      0        8   0.230      10   0.00  0.00
 9   761.73  761.70     7289      0       10   0.170      10   0.39  0.37
10   761.70  761.68     7271      0        8   0.380      10   0.00  0.00

11   761.68  761.68     7271      0        8   0.080      10   0.00  0.00
12   761.68  761.68     7271      0        8   0.170      10   0.00  0.00
13   761.67  761.65     7245      0        7   0.050      10   0.34  0.27
14   761.65  761.64     7236      0        6   0.290      10   0.00  0.00
15   761.64  761.64     7236      0        5   0.290      10   0.11  0.08

16   761.62  761.64     7236      0        5   0.170      10   0.04  0.03
17   764.27  765.55    11460      0      951   0.130    3000   3.11  2.90
18   765.01  764.11     9721      0      963   0.140     130   0.01  0.05
19   763.77  763.24     8773      0      489   0.250      50   0.00  0.00
20   763.05  762.73     8255      0      259   0.270      10   0.00  0.00

21   762.61  762.42     7956      0      153   0.180       5   0.04  0.03
22   762.35  762.21     7754      0       97   0.270       5   0.00  0.00
23   762.16  762.09     7639      0       65   0.200      10   0.00  0.00
24   762.09  762.07     7619      0       53   0.090      30   0.23  0.26
25   762.04  761.98     7534      0       45   0.070      20   0.03  0.03

26   761.97  761.92     7482      0       34   0.140      15   0.01  0.01
27   761.91  761.88     7447      0       28   0.280      10   0.00  0.04
28   761.86  762.09     7639      0       32   0.110     160   0.18  0.14
29   762.18  762.21     7754      0       73   0.030     100   0.41  0.52
30   762.19  762.12     7668      0       69   0.220      30   0.00  0.00
31   762.07  762.00     7552      0       50   0.310      10   0.00  0.00

TOTAL                             0     3510   5.840    3765   5.26  5.09
AVERAGE   762.12                  0      113             121 NORMAL= 5.04

MAXIMUM   765.81       11786   DATE=17    TOP CONSERVATION POOL    761.50
MINIMUM   761.62        7219   DATE=16    TOP FLOOD POOL           784.00

WATER SUPPLY:  WITHDRAWN      0 AC-FT, RELEASED      0 AC-FT

                      INFLOW VOLUME=     7468 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION