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I I I I I I I I I I I I I I I I I I I F. Water Supply Requirements For each of the Planning Districts, projections were made For the expected development of various types of densities of residential housing; retail and commercial/industrial facilities; open space and recreational facil ities; and expected development along the proposed E-470 Highway corridor. These projections were based upon the estimated percentage of build-out for the four Districts within the 30 year construction horizon. The population of unincorporated Arapahoe County in 1988 is approximately 113,000. The projected population by year 2020 is estimated to be approximately 319,329. The study projects that the retail, commercial and light industrial development with the planning Districts will total approximately 172,853,806 square feet. The study concludes that there will be approximately 1l,035 acres of land for pUblic facilities, open space and recreational facilities with the areas studied. Approximately one-third of this acreage is expected to be irrigated. gased on these figures and the design parameters presented in Section-D, the total projected water demand for the study area in the next 30 years wi 11 be approximately 81,638 acre feet per year. A summary for the four referenced districts is presented in Table / 11-2. The projections for each of the individual Districts are shown in the Tables / 11-3, 11-4, 11-5, and 11-6. These fi gures exceed the safe annual \~ater supply yield of the proposed Arapahoe County Union Park Project, and show that the County should anticipate the need for additional sources of water. -19-