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~; If It !t r- II - INVESTIGATIONS 2-01. Project document investigations. The review survey for flood con- trol, "Arkansas River and Tributaries, Las Animas, Colorado, and Vicinity," was published as House Document No. 165, 89th Congress, 1st Session. Investigations and studies were conducted to determine the most practical and economically feasible plan for protection of Las Animas and vicinity. These investigations included a reconnaissance of the location; studT of -available maps; foundation investigations at the project site; property appraisals and flood plain deter- mination; flood damage surveys; detailed analysis of field data and hydrologic and benefit-cost studies. 2-02. Public hearings. Public hearings were held by the Albuquerque District Engineer at Pueblo, Colora?o, on 20 March 19~4 and 3 August 1950, to afford local interests an opportun~ty to present the~r flood problems ana to express their views. concerning the character and extent of water resources im- provements desired on the Arkansas River and tributaries in Colorado. A joint regional public hearing was held at Pueblo, Colorado, on 5 October 1950 by the Arkansas-lfhite-Red-Basins Inter-Agency Committee to discuss the flood problem. 2-03. At the request of the Arkansas River Conservancy District, a meet- ing was held at Las Animas on 8 December 1959. Local interests requested advice regarding the steps to be taken to secure federal assistance, information re- lative to a possible solution of the'problem, and the extent to which local interests would be r~quired to participate in a flood control improvement~ Another meeting was held at Las Animas on 12 June 1962 with Conservancy District officials, city officials, and State and Federal government fish and wildlife officials to discuss the preliminary plan of improvement for flood control and to consider the possibilities of incorporating plans for the construction of a small fishing lake in connection therewith. 2-04. Definite project investigations. Project document studies and investigations were reviewed. Instrumental'surveys in conjunction with aerial photos and photogrametric development of required topography; foundation ex- plorations; field and laboratory investigations of foundation and construction materials; cost studies; and review of the project document economic analysis have been accomplished. Hydrology was reviewed and hydraulic, structural and levee designs were analyzed to establish channel capacities, alignment, hydraulic and structural requirements. A field reconnaissance of the site was made and contact with local interests regarding various aspects of the project was accom- plished. Detailed studies were made of interior drainage problems to develop the most practical and economical plan. Changes in levee alignment were studied in order to minimize the amount of cultivated land required for levee construc- tion. Real estate requirements and costs have been reanalyzed by field appraisal. Alterations of railroad facilities, county roads, utilities, and other improve- ments have been coordinated with the owners. The recommended plan has been co- ordinated with city and other interested agencies. \.... 3 ',$".