WSP08103

• File Number: 8278.400
• Description: Title I - Minute 242
• Basin: Colorado Mainstem
• Date: 1/1/2002
• Author: INBWC
• Title: Minute 242 2002 Annual Report
• Water Supply Pro - Doc Type: Annual Report

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

A REPORT ON SALINITY OPERATIONS
ON THE COLORADO RIVER UNDER MINUTE NO. 242

January 1 - December 31,2002

This report presents the results of operations from January] through December 3] , 2002 under the
agreement with Mexico entitled, .Permanent and Definitive Solution to the International Problem of
the Salinity of the Colorado River," incorporated in Minute No. 242 dated August 30,1973 of the
International Boundary and Water Commission, United States and Mexico (mwC). The operations
began on June 25, 1974, immediately following approval of the Enabling Legislation, Public Law 93-
320.

This report is based upon records of flows and salinities determined jointly by the United States and
Mexican Sections of the mwc, the United States Bureau of Reclamation (USBR) and the United
States Geological Survey (USGS). Locations and features referred to in this report are shown in
Exhibit I.

The records show that the United States operations resulted in compliance with the agreement in
Minute No. 242.

The Salinity DilTerential

Minute No. 242 provides in Point I that:

"The United States shall adopt measures to assure that . the approximately
] ,360,000 acre-feet (1,677,545,000 cubic meters) delivered to Mexico upstream of
Morelos Dam, have an annual average salinity of no more than I] 5 p.p.m,:!: 30 p.p.m.
U.S. count (12] p.p.m.:!: 30 p.p.m. Mexican count) over the annual average salinity
of Colorado River waters which arrive at Imperial Dam.. "

The records show that during 2002:

]) Scheduled deliveries of water from the Colorado River in the quantity of ],500,00] acre-feet
or 1,850,234 thousand cubic meters (tcm) were made to Mexico in accordance with Article
10 of the ] 944 Water Treaty consisting of ],382,710 acre-feet (1,705,558 tcm) at the river
bed above Morelos Dam and 117,290 acre-feet (144,676 tcm) across the land boundary near
San Luis, Arizona and at the limitrophe section of the river below Morelos Dam. Other
waters delivered to Mexico in the limitrophe section amounted to 123,162 acre-feet (] 51,919
tcm).

2) The annual flow weighted average salinities of the waters of the Colorado River a) upstream
of Morelos Dam, b) arriving at Imperial Dam, and the resulting salinity differentials were as
follows:

2