WSP06463

• File Number: 8278.400
• Description: Title I - Mexican Treaty and Minute 242
• Basin: Colorado Mainstem
• Date: 1/1/1992
• Author: IBWC
• Title: Minute 242 Annual Report
• Water Supply Pro - Doc Type: Annual Report

e

e

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

January 1, 1992 - December 31, 1992

This report presents the results of operations during the eigh-
teenth calendar year from January 1, 1992 through December 31,
1992, under the agreement with Mexico, entitled, "Permanent and
Definitive Solution to the International Problem of the Salinity of
the Colorado River" incorporated in Minute 242 dated August 30,
1973, of the International Boundary and Water commission, United
States and Mexico. The operations began on June 25, 1974, immedi-
ately following approval of the Enabling Legislation, Public Law
93-320.

This report is based upon the records of flows and salinities
determined jointly by the United States and Mexican Sections of the
International Boundary and Water commission, the U.S. Bureau of
Reclamation, and the U.S. Geological Survey. Locations and fea-
tures referred to in this report are shown on the map, Exhibit 1.

The records show that the United States operations were in compli-
ance with the agreement in Minute No. 242.

The Salinity Differential
Minute No. 242 provides in Point 1 that:

"The United States shall adopt measures to assure that ... the
approximately 1,677,545,000 cubic meters (1,360,000 acre-feet)
delivered to Mexico upstream of Morelos Dam have an annual average
salinity of no more than 115 ppm + 30 ppm U.S. count (121 ppm + 30
ppm Mexican count) over the annual average salinity of Colorado
River waters which arrive at Imperial Dam ..."

The records show that during calendar year 1992:

1) Scheduled deliveries of water of the Colorado River in the
quantity of 1,850,234,000 cubic meters (1,500,000 acre-feet)
were made to Mexico in 1992 in accordance with Article 10 of
the 1944 Treaty consisting of 1,692,865,000 cubic meters
(1,372,419 acre-feet) in the river bed above Morelos Dam,
300,000 cubic meters (243 acre-feet) of emergency deliveries
to the City of Tijuana, and 157,069,000 cubic meters (127,338
acre-feet) across the land boundary near San Luis, Arizona
and in the limitrophe section of the river below Morelos Dam.

Other waters arriving at the Mexican
amounted to 99,581,000 cubic meters
consisting mainly of regulatory waste.

points
(80,732

of diversion
acre-feet) ,