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<br />14t;S
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<br />PLATE 9
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<br />FRAMEWORK STUDY REGIONS IN PACIFIC SOUTHWEST
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<br />Upper and Lower Basin which, together
<br />with augmentation by a low salinity water,
<br />will keep the river's salinity at, or below, pre-
<br />sent day levels.
<br />During 1970, the Upper Colorado Region
<br />Framework Study participants presented al-
<br />ternative regional plans based upon varying
<br />levels of water use to year 2020, as follows:
<br />(I) 6.5 million acre-feet per year depletions,
<br />including reservoir evaporation, (2) 7.5 mil-
<br />lion acre-feet per year depletions plus reser-
<br />voir evaporation, and (3) depletion of water
<br />supply available at site without regard for
<br />downstream water rights (approximately 9,4
<br />million acre-feet per year depletions). By
<br />comparison, estimates ofthe U. S, Bureau of
<br />Reclamation show that maximum Upper Ba-
<br />sin depletions, including reservoir evapora-
<br />tion, will be only 5.8 million acre-feet per
<br />year by year 2030,
<br />The Board staff also participated in the
<br />preparation of the Analytical Summary Re-
<br />port for the Pacific Southwest Area during
<br />1970, This report summarizes the framework
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<br />CD CALIFORNIA REGION
<br />@ GREAT BASIN REGION
<br />@ UPPER COLORADO REGION
<br />o LOWER COLORADO REGION
<br />-- REGJONAL BOUNDARY LINES
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<br />studies of the four major water resource re-
<br />gions of the Pacific Southwest and interprets
<br />the economic and other interrelationships of
<br />the four regions,
<br />Western United States Water Plan Study.
<br />The Western U, S. Water Plan Study
<br />(called "Westwide Studies") originated in
<br />Titles I and II of the Colorado River Basin
<br />Project Act of 1968 (P.L. 90-537), The Act
<br />states that it is the policy of the Congress that
<br />the Secretary of the Interior shall continue to
<br />develop a regional water plan "to serve as the
<br />framework under which projects in the Colo-
<br />rado River Basin may be coordinated. . ." It
<br />also directs the Secretary to conduct "full
<br />and complete reconnaissance investigations
<br />for the purpose of developing a general plan
<br />to meet the future water needs of the West-
<br />ern United States." The investigations en-
<br />compass those states lying wholly or in part
<br />west of the Continental Divide: Arizona,
<br />California, Colorado, Idaho, Montana, Ne-
<br />vada, New Mexico, Oregon, Utah, Washing-
<br />ton, and Wyoming. The investigation is to be
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