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Last modified
1/26/2010 12:13:01 PM
Creation date
10/11/2006 9:33:40 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8278.400
Description
Title I - Mexican Treaty and Minute 242
Basin
Colorado Mainstem
Date
1/1/1972
Author
IBWC
Title
Minute 242 Annual Report
Water Supply Pro - Doc Type
Annual Report
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<br />.. <br /> <br />REPORT ON OPERATIONS <br />FOR SOLUTION OF THE COLORADO RIVER <br />SALINITY PROBLEM UNDER MINUTE NO. 218 <br />FOR PERIOD NOVEfIBER 16, 1971 THROUGH JUNE 30, 1972 <br /> <br />" <br /> <br />This report presents the results of the final period of operations, <br />November 16, 1971 through June 30, 1972, under Minute No. '218 between the <br />United States and Mexico entitled "Recommendations on the Colorado River <br />Salinity Problem." On November 15, 1971, the two Governments agreed by <br />an exchange of notes to again extend the 5-year agreement reached by <br />Minute No. 218, through November 15, 1972, with the understanding that <br />the extension might be superseded by a new agreement if one was reached <br />before that date. A new agreement, Minute No. 241, was signed on July 14, <br />1972, which retroactively terminated Minute No. 218 on June 30, 1972. <br /> <br />This report outlines the results of operations during the partial seventh <br />year under Minute No. 218 and summarizes operations for the past six years, <br />seven and one-half months under Minute No. 218, according to the records <br />secured by the U.S. Section, International Boundary and Water Commission, <br />the Bureau of Reclamation, and the Geological Survey. <br /> <br />1. Salinity of Waters to Mexico <br /> <br />. <br /> <br />The results of the operations during this period in terms of average salinity <br />of Colorado River treaty deliveries to Mexico at the northerly boundary, <br />are presented on two bases: <br /> <br />a) On the basis of the United States operations under llinute <br />No. 218 which resulted in an average salinity during the <br />final period of 1266 ppm, an increase of 15 ppm over the <br />average for the comparable seven and one-half months in the <br />6th year of operations under Minute No. 218. <br /> <br />b) On the basis of the combination of United States operations <br />under Hinute No. 218, plus the voluntary by-pass by Mexico <br />of additional Well ton-Mohawk drainage waters, which resulted <br />in an average salinity of waters actually diverted by Mexico <br />during the final period of 1174 ppm, an increase of 5 ppm <br />over the average for the comparable seven and one-half months <br />in the 6th year of operations. <br /> <br />The increase of 15 ppm under United States operations was due to a number <br />of f~cto~s not ~ll OF ~hich c~n be isolated. The major factor appears to be <br />the increase of salinity of South Gila drainage between the final period and <br />the comparable period in the 6th year of operations and the small decrease in <br />the salinity of jvellton-Mohawk drainage waters as compared to that in prior <br />years. In addition Mexico changed its schedule of monthly requests I-lhich <br />shifted more "ater into winter months when salinities at Imperial Dam are high. <br /> <br />. <br />
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