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UCl2303 . . EXECUTIVE DIRECTOR'S MONTHLY REPORT TO THE COLORADO RIVER BOARD OF CALIFORNIA October 19,1999 RECEIVED on 2 5 1999 AGENCY MANAGERS' REPORT Colorado Wal&f ConservatiOll Board The Agency Managers have not met since the August Board meeting. PROTECTION OF EXISTING RIGHTS Colorado River Water Report During August 1999, storage in the major Upper Basin reservoirs decreased by 108,000 acre-feet and storage in the Lower Basin reservoirs increased by 252,000 acre-feet. Total System active storage as of the end of August was 56.161 million acre-feet (Olaf) or 94 percent of capacity, which is 0.228 mafless than one year ago. September releases from Hoover, Davis, and Parker Dams averaged 11,960, 15,080 and 13,160 cubic feet per second (cfs), respectively. Planned releases from those three dams for the month of October are 14,900, 16,500 and 13,900 cfs, respectively. The October releases represent those needed to meet downstream water requirements and flood-control space building requirements. The observed April through July 1999 unregulated inflow into Lake Powell was 7.621 Olaf, which is 99 percent of the 30-year average for the period 196 I -1990. The unregulated inflow into Lake Powell for the 1998-99 water year was 12.748 Olaf, or 109 percent of the 3D-year average. The Lower Division states' estimated consumptive use of Colorado River water for calendar year 1999, as estimated by Board staff, totals 8.176 Olaf and is projected as follows: Arizona, 2.796 Olaf; California, 5.1 II Olaf; and, Nevada, 0.269 Olaf. Estimated additional unmeasured return flow credits of 0.235 Olaf would reduce the total amount to 7.941 Olaf. For calendar year 1999, the Central Arizona Project (CAP) is projected to divert 1.446 Olaf, of which 330.000 acre-feet is to be placed in the Arizona Water Bank, and The Metropolitan Water District of Southern California (MWD) is projected to divert 1.219 Olaf. The October I" estimate of 1999 end-of-year California agricultural consumptive use of Colorado River water under the fIrst three priorities of the 1931 California Seven Party Agreement is 3.833 Olaf. This estimate is based on the collective use through September 1999 by the Palo Verde Irrigation District (PVID), the Yuma Project Reservation Division (YPRD). the Imperial Irrigation District (lID), and the Coachella Yalley Water District (CYWD). Figure I, found at the end of this report, depicts the historic end-of-year agricultural use for the year.