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<br />. <br /> <br />00 <br />~ <br />L'" <br />C! <br />C~ <br /> <br />'-'. <br /> <br />CHAPTER I <br /> <br />INTRODUCTION <br /> <br />This report presents the results of an inflow-outflow river budget <br /> <br />analysis for the Grand Valley area. The purpose of the analysis, was to <br /> <br />quantify the salt loading to the Colorado River as it passe" through the <br /> <br />valley. The determination of the amount of salt loading th:tough the valley <br /> <br />is a necessary first step in the evaluation of alternative "alinity reduction <br /> <br />plans for the Grand Valley Unit in Color"do. <br /> <br />Authorization <br /> <br />The Grand Valley Unit was authorized for construction by the Colorado <br /> <br />. River Basin Salinity Control Act of 1974 (Public Law 93-320) as part of a <br /> <br />. <br /> <br />basinwide program for the enhancement and protection of the quality of water <br /> <br />available in the Colorado River for use in United States and. the Republic of <br /> <br />Mexico. Title I of the Act, which was directed toward controlling the <br /> <br />salinity of river water below Imperial Dam for use in the United States and <br /> <br />the Republic of Mexico, authorized the construction of a desalting complex <br /> <br />and other measures to ensure acceptable salinity levels. Title II, which was <br /> <br />directed toward salinity control in the United States above Imperial Dam, <br /> <br />authorized the construction of the Grand Valley Unit and three other units as <br /> <br />the initial stage of the Colorado River Basin Salinity Control Project. It <br /> <br />also directed that planning reports be expedited on 12 additional units. A <br /> <br />thirteenth unit has been added for study since the passage of the Act. <br /> <br />I-I <br />