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I I I I I I I I I I I I I I I I I I I EXECUTIVE SUMMARY The purpose of the Water Requirements and Availability Study is to quantify the future water requirements of the District over the next 50 years and to determine the volume of water that might be available for use by others. Realizing the inherent inaccuracies and uncertainties with projections 50 years into the future, this Study should be updated at regular time intervals (every three to five years). Historical water use, land use, and population totals were analyzed in conjunction with identified trends and projected growth estimates to determine the future water requirements of the District. Assuming that current cropping patterns and agricultural practices continue, water use within lID in the year 2045, with no additional conservation beyond existing programs, is estimated to be approximately 2,996,100 acre-feet. This approximate 3 million acre-feet of water assumes that the current level of farmable area has been reduced from 490,000 acres to 427,600 acres. This reduction of 62,400 acres is due to a projected increase in current urban land use. As shown in Table ES-l, the District's total 2045 water requirement, including conserved water used by other agencies but charged as a diversion by IID, is estimated to be 3,169,200 acre-feet per year. Table ES-l Total Projected Water Requirement in 2045 Component Projected Water Requirement Agriculture 2,394,600 Municipal 174,466 Industrial 70,3 10 Feedlots 7,000 Miscellaneous Other 38,245 Operational (adjusted for IID/MWD and AAC) 311,447 Total Projected Water Use in 2045 (without additional water conservation) 2,996,068 Potential AAC Lining Conservation/Transfer (charged as a diversion to lID)! 67,000 IID/MWD Water Conservation Programs Charged to lID"' 106,110 Total Projected Water Requirement in 2045 3,169,178 . . On December 19, 1995, the lID Board of Directors elected not to extend the IID/MWD AAC lmmg agreement beyond December 31, 1995. 2 Reverts to lID in 2032 and would potentially be available for marketing to other Colorado River water users at that time. Draft: Subject To Revision 1/3/96 ES-l