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I I I I I I I I I I I I I I I I I I I -0015J8 Scope of the Technical Memorandum By agreement with the U.S. Water Resources Council, the Missouri River Basin Commission is a regional sponsor for the 1975 National Water Assessment. Under the agreement, the commission is responsible for conducting a Specific Problem Analysis for the Missouri River Basin, one of twenty-one water resources regions across the country. The content and organization of this Technical Memorandum follow the Water Resources Council 's October 1975 guidelines for conducting the second major activity of the Specific Problem Analysis. This is the second of four technical memoranda which the commission will prepare in the course of its participation in the assessment. The memorandum is presented in three principal parts. They are the State/Regional Future, Modified Central Case Comments and Comparison and Problems and Issues. Five appendices are also included to support the materials contained in the main report. State/Regional Future The basic geographical unit of the National Assessment is the aggregated subarea (ASA). The Missouri River Basin is made up of 11 such areas, each constituting a county-line approximation of a large drainage area as shown on map page 1-3. However, in order to increase the meaningfulness and utility , of the State/Regional Future, its information, except for water supply data, is presented by state as well as by ASA. The State/Regional Future for each ASA is intended to provide information concerning objectives, existing conditions and trends which collectively will enable planners to recognize and evaluate problems, needs and opportunities associated with the management, conservation and development of the water and related land resources in the ASA. The State/Regional Future therefore contains information relating to planning objectives, present and projected socio- economic characteristics, land use, water use and requirements, instream flow needs, water supplies, environmental resources, erosion and sedimentation, water-oriented recreation, flood damages, navigation and water quality. Modified Central Case (MCC) Comments and Comparison The second major section of the Technical Memorandum is a two-part evaluation of the Modified Central Case. The Modified Central Case is a set of information prepared in much the same format as the State/Regional Future, but by federal agencies from a national perspective. During the course of preparation of the MCC, the commission has made some observations on the Modified Central Case which may assist in understanding some of the differences between the Modified Central Case and State/Regional Future, which are pointed out in the second part of this section. While the selected comments on the Modified Central Case are fairly general, the comparison of the Modified Central Case to the State/Regional Future follows the format of the latter. It should be noted that in certain instances compari- son is difficult or impossible due to incompatibility of data. I-I