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(./ .: .\ .' ( <- j. - 24 - . SECTION 2 INVESTIGATIONS, ANALYSES, AND SUPPORTING TABLES INVESTIGATIONS-AND ANALYSES Project For.mulation The prtrnary objective of this .plan is to provide floodwater and sediment protection to: (l) the City of Grand Junction, (2) the surrounding public, commercial, and suburban developments, (3) the agricultural lands in the floodplain, and (4) public and private utilities, roads, and railroads. The most satisfactory solution to achieve the stated objectives provides for: (1) the installation of one floodwater-retarding structure located about 1 1/2 miles above the High Line Canal which marks the approximate upper limits of the damage area, (2) utilization of the floodwater-retarding effects of the High Line Canal, (3) utilization of the improved section of the Indian Wash flood channel through the floodplain area, (4) the application of land trea~~ent measures on the publicly-owned lands in the drainage area above the floodwater-retarding structure, and (5) the application of land treatment measures on the publicly and privately-owned agricultural lands that are above the principal floodpla~n damage areas. . The optimum and minimum levels of flood protection were agreed upon at a meeting between representatives of the Corps of Engineers, Los Angeles District, and the Soil Conservation Service. Following this meeting the kinds and intensities of studies to be undertaken during the preliminary planning stages along with project objectives were arrived at in a planning conference with members of the Lincoln Engineering and Watershed Planning Unit. The preliminary studies were a joint investigation by the technicians of the Los Angeles Office of the U. S. Corps of Ar.my Engineers and the U. S. Soil Conservation Service. The Corps obtaine~ channel, bridge, and economic da.ta in the agricultural and urban areas below the High Line Canal and the Soil Conservation Service obtained data on three possible dam sites on the rangelands above the High Line Canal. The Corps combined the joint study and cost data and made a letter report to the Soil Conservation Service .