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Aspinall Unit and certified to Congress and the President that the benefits of the Aspinall Unit exceeded its costs. 70 stat. 105, 43 U.S.C. 620. 29. The 1959 Economic Justification Report: The additional engineering and economic investigations were performed and the Aspinall Unit was "found to be engineeringly feasible and economi- cally justified." (Exhibit 182, Letter of Transmittal, Page II!.) The "Economic Justification Report of February 1959" [the "1959 Report"] (see : Exhibit 182, begin at p. XXI) to Congress states the assumptions under which the Aspinall Unit was found by the secretary to be economically justified. Said report and correspon- dence relating to it demonstrate the following assumptions and bases for approval of the Aspinall Unit: a. That the Aspinall Unit would be developed to achieve the following purposes: power generation, flood control, irriga- tion, and extensive recreational benefits. (Exhibit 182, p. XXIII). In fact the opening sentence of the Purpose and Scope section of the Report stated: "The object of the Curecanti (Aspinall) unit is primarily to develop the water storage and hydro- electric power generating potentialities along a 40-mile section of the Gunnison River in Colorado. Other purposes of the, unit are irrigation, recre- ation, and flood control." (Exhibit 182, p. 1) b. With respect to water availability for the Aspinall Project, the 1959 Report stated: "Fortnrs study-it was assumed that no additional water use developments upstream from the Gunnison tunnel would occur prior to 1970 since none of the authorized participating projects of the Colorado River storage project are located in the upper Gunnison River Basin. Five potential participat- ing projects in that basin, however, were men- tioned in the legislation authorizing the storage project as being among the projects to be given priority in future investigations and planning reports. These are the Tomichi Creek, East River, Ohio Creek, Fruitland Mesa and Bostwick Park projects. Depletions from these projects were assumed to begin in 1971 and increase uniformly until full depletion is reached in 2020. It was estimated that between 1970 and 2020 average annual depletions would increase by 40,000 acre- feet above the Blue Mesa Dam site, by 50,000 acre- feet above the Morrow Point Dam site, and by 60,000 acre-feet above the Crystal Dam site. After vear 2020 no further additional deoletions were anticiDated. The annual depletions were assumed to vary slightly from year to year in accordance with the available water supply. A 19