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Draft Plan of Study <br />for <br />The 1975 Assessment <br />of <br />Water and Related Land Resources <br />INTRODUCTION <br />The 1975 Assessment of the Nation's water and related land <br />resources is undertaken by the U. S. Water Resources Council to <br />carry out one of its functions required by the Water Resources Plan- <br />ning Act of 1965, 1 / which states the Council shall, <br />"... maintain a continuing study and prepare an assessment <br />biennially, or at such less frequent intervals as the Council <br />may determine, of the adequacy of supplies of water <br />necessary to meet the water requirements in each water <br />resource region in the United States and the national interest <br />therein. " <br />The Nation's first assessment, completed in 1968, was a <br />first step in the development of a continuing assessment process. On <br />a national and broad regional scope, it described the nature of available <br />water and related land supplies, projected requirements to the year <br />2020, and identified and discussed emerging problems. The 1968 <br />Assessment also contained recommendations fob a three phase approach <br />for conducting future assessments: <br />"Phase I - Initial assessments of the adequacy of the <br />national water supply based on readily available data and <br />limited analyses. <br />"Phase II - More fundamental analytical frameworks for <br />the assessment and more detailed measures of adequacy <br />requiring substantial data inputs. <br />"Phase III - Continuing refinement of Phase II exploring <br />the relationships of the water supply -use comparisons and <br />the measures of adequacy to economic factors, differences <br />in productivity, institutional constraints, and other factors. <br />1/ The legislative reference to the assessment is found in section <br />102 of Public Law 89 -80, the Water Resources Planning Act. <br />