WSP02956

• File Number: 8210.140.20.A
• Description: Colorado River - Colo River Basin - Orgs/Entities - CRBSF - California - Colo River Board of Calif
• State: CA
• Date: 2/11/2003
• Author: Gerald Zimmerman
• Title: Executive Directors Monthly Report to the Colorado River Board of California
• Water Supply Pro - Doc Type: Report/Study

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EXECUTIVE DIRECTOR'S MONTHLY REPORT
TO THE
COLORADO RIVER BOARD OF CALIFORNIA

February 11. 2003

AGENCY MANAGERS MEETING

The Agency Managers have not met since the January Board meeting.

PROTECTION OF EXISTING RIGHTS

Colorado River Water Report

As of February 1,2003, storage in the major Upper Basin reservoirs decreased by 516,000
acre-feet and storage in the Lower Basin reservoirs increased by 152,000 acre-feet during January.
Total System active storage as of February 6th was 36.325 million acre-feet (mat) or 61 percent of
capacity, which is 8.149 maf less than one year ago.

January releases from Hoover, Davis, and Parker Dams averaged 10,590,9,890 and 6,150
cubic feet per second (cfs), respectively. Planned releases from those three dams for the month of
February 2003 are 12,800,12,100, and 8,300 cfs, respectively. The January releases represent those
needed to meet downstream water requirements including those caused by reduced operation of
Senator Wash reservoir.

The Lower Division States' consumptive use of Colorado River water for calendar year 2002,
as calculated by Board staff, totals 8.678 maf and is distributed as follows: Arizona, 3.008 maf;
California, 5.364 maf; and Nevada, 0.305 maf. Unmeasured return flow credits of 0.263 mafwould
reduce the total amount of projected consumptive use to 8.415 maf. All three Lower Basin states
have increased their consumptive use of mainstream water due to drought conditions. For calendar
year 2002, the Central Arizona Project (CAP) diverted 1.582 maf, of which 0.346 maf is to be
credited to the Arizona Water Bank, and The Metropolitan Water District of South em California
(MWD) will divert 1.236 maf.

The preliminary end-of-year estimate for 2002 California agricultural consumptive use of
Colorado River water under the fust three priorities and the sixth priority of the 1931 California
Seven Party Agreement is 4.031 maf. This estimate is based on the collective use through December
2002 by the Palo Verde Irrigation District, the Yuma Project Reservation Division (YPRD), the
Imperial Irrigation District, and the Coachella Valley Water District. Figure 1, found at the end of
this report, depicts the historic projected end-of-year agricultural use for the year.

The 2002 annual flow-weighted average salinity differential between the Northerly
International Boundary (NIB) and Imperial Dam was 140.9 parts per million (ppm), which is within
the Minute No. 242 of the Mexican Treaty requirement of 130 io 15 ppm.