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Show PART I BITRODUCTION Purpose and Scope The specific purposes of the Irrigation and Drainage Appendix are to: (l) identify all presently irrigated and potentially irrigable lands, (2) determine the adequacy of water supplied to presently irri- gated lands and water requirements of potentially irrigable lands, (3) show projected acreage of irrigated lands and the amount of water required to meet the production needs in the Upper Colorado Region for the years I98O, 2000, and 2020, including programs and costs for irriga- tion and drainage, and (k) present alternate levels of development. Appendix X includes irrigation data for the region according to the following principal parts: Part I. Introduction.-A brief discussion of the appendix and its scope and limitations. Part II. Present status of irrigated land.--A summary of presently irrigated acres by source and adequacy of water supply, irrigation prac- tices, water utilization, water quality, water rights, drainage, and irrigation's contribution to the economy of the region. Part III. Irrigation potential.-A summary of the potentially irri- gable lands, water requirements, and availability of irrigation water. Part IV. Future demands.-A summary of projected demands for ir- rigated land, water requirements, water quality, land use and crop pro- duction, drainage requirements, and costs for irrigation for the years 1980, 2000, and 2020. Part V. Alternate levels of development.-A summary of the OBERS "as published" for determining irrigated acreage requirements and vari- ous State alternative levels of irrigation development based upon water supply. The Office of Business Economics (OBE) has provided population pro- jections in the region for the target years I98O, 2000, and 2020. The Economic Research Service (ERS) has provided data for the agricultural sectors of the regional and subregional economy consistent with the popu- lation projections. The combined projections have been designated as "OBERS." A "Regional Interpretation" has been applied in determining crop production needs consistent with livestock output projections and a corresponding irrigated acreage requirement. Hereafter, when the term |