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<br />Recognizing that it is beyond the scope of this study to define an absolute <br />base flow for any of the streams studied, the Corps proposed to the HPSC that a <br />range of flows be considered for water potentially available for transfer and a <br />range of cost estimates corresponding to the potentially available water. That <br />is not to suggest that any of the water is surplus now or in the future. Actual <br />decisions and agreements regarding water surplus can only be made after detailed <br />and extensive feasibility scope study. This study is simply an evaluation of <br />the engineering feasibility of interstate water transport and the costs and <br />impacts involved. <br /> <br />DESIGN AND COST ESTIMATES <br />Design efforts for water transfer systems in this study were carried only to <br />the level of detail required for reconnaissance-level cost estimates. Toward <br />that end, maximum use was made of cost curves and other generally accepted <br />expedient means of cost estimation that were found to be useful. These expedi- <br />ent methods were necessary because of the number of water transfer alternatives <br />that were studied and the limited time and funds available for this study. <br />Major structures included in the water transfer systems are capture facilities <br />at the water sources; canals; pumping plants; sources, intermediate and terminal <br />storage facilities; highways; and railroads. Distribution facilities within <br />the High Plains irrigation areas are not included. The cost estimates include <br />lands, easements, and rights-of-way; relocations costs; equipment and construc- <br />tion costs; interest during construction; operation and maintenance costs <br />(including energy requirements); mitigation of wildlife resources directly <br />attri butab I e to water trans fer systems, and replacement of major facil it i es. <br />To ai din mak i ng des i gn and cost estimates and to assu re comparabil ity among <br />the alternative routes, a design and cost manual was prepared. It is included <br />as Appendix E. The manual was developed from information developed in previous <br /> <br />22 <br />