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Show PART IV FUTURE DEMAND The continuing on-farm irrigation improvement program on 910,880 ac- res of presently irrigated lands, including 421,100 acres to receive sup- plemental water and 489,780 acres with an adequate water supply, is shown in Table 43. These 5O-5O cost-sharing installation costs for improving the present irrigation system for increased yields will total approxi- mately $32,846,000 by 2020. Project costs Non-Federal Developments Project costs for non-Federal irrigation developments in the region involving some 87,000 acres of potentially irrigable land and 94,900 ac- res of supplemental service land not included in Federal irrigation proj- ects are estimated to total $4^,894,000 by 2020. These costs, with other supporting land and water data, are listed in Table 44. Although desig- nated as non-Federal, costs for these private irrigation developments are shared by the Government and by the land owners involved, usually on the basis of 65-35 percent, respectively. Federal Developments Specific-use costs.-Federal irrigation developments in the region, involving some 587-4 million acres of potentially irrigable land and ap- proximately 421,100 acres of supplemental service land, are estimated to cost $366,590,000 by 2020, as shown in Table 45. This total includes specific costs identified with single-purpose Federal irrigation develop- ments, such as main and secondary laterals, pumping plants, some main ca- nals, and other items not listed in previous tables. Joint-use costs.-Costs of major multipurpose facilities, such as reservoir storage, collection systems for reservoirs, and most main water conveyance systems, are distributed among the "major functions" (irriga- tion, flood control, recreation, etc.) in accordance with proportionate use. The prorated share of these joint-use costs attributable to irriga- tion totaLs $269,200,000, as listed also in Table 45. This includes joint-use costs of major multipurpose non-Federal irrigation facilities, some of which are included in Table 44. Other costs There may be other direct and indirect costs which cannot be accu- rately identified until actual project feasibility studies are made. These miscellaneous costs may include the cost of acquiring land, cost of discontinuing current uses of lands to be developed for irrigation, increased costs for environmental protection, etc. 88 |