WSP12285

• File Number: 8278.400
• Description: Title I - Mexican Treaty and Minute 242
• Basin: Colorado Mainstem
• Date: 1/1/1993
• Author: IBWC
• Title: Minute 242 Annual Report
• Water Supply Pro - Doc Type: Annual Report

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

January 1, 1993 - December 31, ~993

This report presents the results of operations during the nine-
teenth calendar year from January 1, 1993 through December 31,
1993, 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. The operations began on June 25, 1974,
immediately 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 (IBWC), the U.S. Bureau
of Reclamation (USBR), and the U.S. Geological Survey (USGS).
Locations and features referred to in this report are shown on the
map, Exhibit 1.

The 1993 records show that the united States operations were in
compliance with the agreement in Minute No. 242.

Scheduled Deliveries

The records show that during calendar year 1993, the United States
met the scheduled deliveries of waters requested by Mexico of the
Colorado River in the quantity of 1,850,234 thousand cubic meters
(1,500,000 acre-feet) in accordance with Article 10 of the 1944
Treaty, consisting of 1,710,305 thousand cubic meters (1,386,561
acre-feet) in the river bed above Morelos Dam, and 139,929 thou-
sand cubic meters (113,442 acre-feet) across the land boundary near
San Luis, Arizona and in the limitrophe section of the river below
Morelos Dam.

Total deliveries arriving at the Mexican points
amounted to 6,262,440 thousand cubic meters (5,869,861
consisting mainly of flood flows from the Gila River.

of diversion
acre-feet),

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

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