U.S. Bureau of Reclamation - Central Valley Operations Office
                                                                        Delta Outflow Computation (values in c.f.s.)

                                                                                December 2002
Estimated numbers are in bold print
                                         DELTA INFLOW                                           DELTA EXPORTS                               OUTFLOW INDEX         EXPORT/INFLOW
         Sacto R          Yolo + East Side        S. Joaquin Riv Total          Clifton         Contra Byron        Total    3-day
        @Freeport  SRTP    Misc   Streams          7-day Monthly Delta           Court   Tracy  Costa Bethany NBA   Delta     Avg     NDOI   7-day Monthly  Daily 3 Day 14 Day
  Date   prev dy prev wk prev dy  prev dy prev dy   Avg    Avg   Inflow   NDCU   (CLT)   (TRA)  (CCC) (BBID)       Exports TRA & CLT daily    Avg    Avg     (%)   (%)   (%)
12/01/02   9,879     153       0      306   1,409  1,430  1,402  11,747   2,000   1,496   4,292    58      0    59   5,906    6,103   3,841  3,818   3,841   49.3% 51.2% 48.0%
12/02/02  10,050     152       0      306   1,402  1,417  1,400  11,910   2,000   1,993   4,286    67      0    66   6,411    6,115   3,499  3,750   3,670   52.7% 51.6% 48.8%
12/03/02  10,230     152       0      306   1,397  1,408  1,397  12,085   2,000   1,990   4,284    75      0    74   6,422    6,114   3,663  3,715   3,668   51.9% 51.3% 49.3%
12/04/02  10,401     152       0      306   1,391  1,402  1,394  12,250   2,050   1,994   4,284    70      0    74   6,422    6,277   3,778  3,709   3,695   51.3% 52.0% 51.1%
12/05/02  10,549     152       0      308   1,385  1,397  1,391  12,394   2,100   1,997   3,664    73      0    71   5,805    6,071   4,489  3,807   3,854   45.7% 49.6% 49.6%
12/06/02  10,738     153       0      305   1,382  1,395  1,393  12,578   2,100   1,988   3,405    73      0    81   5,547    5,777   4,931  3,960   4,033   42.9% 46.6% 47.3%
12/07/02  10,869     153       0      300   1,401  1,394  1,394  12,723   2,150   1,977   2,904    70      0    83   5,035    5,312   5,538  4,248   4,248   38.4% 42.3% 43.3%
12/08/02  11,193     153       0      300   1,401  1,393  1,394  13,047   2,150   2,014   2,716    70      0    72   4,873    5,002   6,024  4,560   4,470   36.3% 39.1% 40.7%
12/09/02  11,457     153       0      301   1,393  1,395  1,396  13,304   2,150   1,970   2,719    78      0    64   4,831    4,767   6,323  4,964   4,676   35.2% 36.6% 38.6%
12/10/02  11,426     153       0      309   1,410  1,399  1,398  13,298   2,200   1,993   2,729    80      0    47   4,849    4,714   6,249  5,333   4,833   35.5% 35.7% 38.0%
12/11/02  12,055     153       0      314   1,420  1,404  1,400  13,942   1,744   1,979   2,716    72      0    14   4,781    4,702   7,417  5,853   5,068   33.7% 34.8% 37.5%
12/12/02  12,017     153       0      309   1,422  1,415  1,405  13,901   1,744   1,980   2,716    74      0     0   4,770    4,704   7,387  6,267   5,262   33.8% 34.3% 37.2%
12/13/02  12,102     152       0      312   1,458  1,429  1,413  14,024   1,744   2,968   2,718    66      0     0   5,752    5,026   6,529  6,495   5,359   40.5% 36.0% 39.3%
12/14/02  12,057     152       0      349   1,502  1,460  1,427  14,060  (2,364)  3,492   3,411    60      0     0   6,963    5,762   9,462  7,056   5,652   49.1% 41.2% 44.5%
12/15/02  14,539     152   5,918      424   1,612  1,502  1,445  22,645  (5,331)  3,999   3,712    66      0     0   7,777    6,767  20,200  9,081   6,622   34.1% 40.0% 49.3%
12/16/02  19,770     152   1,797      690   1,693  1,552  1,464  24,102  (5,331)  4,497   3,435    47      0     0   7,979    7,515  21,454 11,242   7,549   32.9% 37.1% 51.5%
12/17/02  34,656     152  11,591    1,139   1,760  1,652  1,503  49,298 (14,003)  3,000   2,997    37      0     0   6,034    7,213  57,268 18,531  10,474   12.2% 22.5% 41.8%
12/18/02  46,348     152     426    1,318   2,117  1,807  1,559  50,361 (14,282)  7,192   3,562    36      0     0  10,791    8,228  53,852 25,164  12,883   21.4% 19.9% 41.2%
12/19/02  48,465     152       0      819   2,508  1,949  1,606  51,944 (10,174)  7,400   3,777    44      0     0  11,221    9,309  50,897 31,380  14,884   21.5% 18.4% 40.8%
12/20/02  53,160     152       0      651   2,451  2,115  1,658  56,414 (10,630)  7,494   3,795    27      0    18  11,334   11,073  55,711 38,406  16,926   20.0% 20.9% 42.7%
12/21/02  52,370     152   2,706      734   2,662  2,296  1,717  58,624 (12,734)  7,493   3,783    32      0     0  11,308   11,247  60,050 45,633  18,979   19.2% 20.2% 38.5%
12/22/02  48,889     152   2,806      781   2,883  2,475  1,773  55,511  (4,290)  7,495   3,798    35      0    14  11,342   11,286  48,459 49,670  20,319   20.3% 19.9% 35.0%
12/23/02  48,931     152       0      629   2,946  2,625  1,818  52,658  (4,112)  7,571   3,791    37      0    14  11,412   11,310  45,358 53,085  21,408   21.6% 20.3% 32.3%
12/24/02  51,185     161       0      518   2,810  2,705  1,853  54,674  (4,112)  7,473   3,802    42      0     1  11,318   11,310  47,468 51,685  22,494   20.6% 20.8% 29.8%
12/25/02  50,682     171       0      468   2,675  2,711  1,881  53,996    (739)  7,170   3,792    60      0     0  11,022   11,200  43,712 50,236  23,342   20.3% 20.8% 27.4%
12/26/02  44,675     180       0      442   2,549  2,704  1,901  47,846   1,772   7,521   3,794    48      0     0  11,363   11,184  34,711 47,924  23,780   23.6% 21.4% 25.8%
12/27/02  36,805     190       0      424   2,405  2,651  1,916  39,824   1,950   3,994   2,538    40      0     4   6,577    9,603  31,297 44,437  24,058   16.4% 20.3% 21.3%
12/28/02  31,789     199       0      413   2,287  2,554  1,926  34,688   1,950   4,000   2,039    54      0     0   6,094    7,962  26,644 39,664  24,150   17.4% 19.5% 17.1%
12/29/02  31,403     209     401      463   2,208  2,443  1,934  34,684      74   3,993   2,045    60      0     0   6,098    6,203  28,511 36,815  24,301   17.4% 17.0% 13.1%
12/30/02  39,805     218   1,084    1,225   2,170  2,352  1,942  44,502    (889)  3,994   2,015    48      0    10   6,067    6,029  39,324 35,953  24,802   13.5% 15.9% 12.3%
12/31/02  48,806     212      96      915   2,171  2,282  1,950  52,200  (1,167)  5,000   3,630    47      0    18   8,696    6,893  44,671 35,553  25,442   16.5% 15.7% 14.0%

  Total  857,301   5,044  26,825   16,384  59,680 58,115 49,449 965,234 (58,280)129,118 103,153 1,745      0   782 234,798  230,780 788,716 691,994384,743  945.2%973.2%1147.1%
Average   27,655     163     865      529   1,925  1,875  1,595  31,137  (1,880)  4,165   3,328    56      0    25   7,574    7,445  25,442 22,322           30.5% 31.4% 37.0%