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<br /> - <br /> The methodo\ogy used tn this plan involved several steps. as foHows: <br /> 1. The boundaries of the North San Marcos Service Area were selected, <br /> w1th pr1mary cons1deration given to the abl1ity to serve an area with a <br /> central1zed wastewater co\1ection and treatment system. The area selected <br /> drains into sections of S1nk Creek. the Blanco River. and an Ul'U"Iamed tributary <br /> of the San Marcos River. but u\timately can be most efficienUy served by a <br /> centraHzed treatment facUity located on an unnamed tributary to the San <br /> Marcos River, close to the confluence with the San Marcos River (see <br /> attached map). Table t summarizes the acreages in each subbasin. <br /> 2. A land use map was prepared for the 25-square mt\e Service Area. The <br /> land uses are based on annual population growth projections for the Austin <br /> MSA, Hays County, the City of San Marcos, and specifical1y the North San <br /> Marcos Service Area. Land uses were determined on the basis of the City's <br /> Comprehensive Plan, topographic and other environmental constraints. access <br /> to roadways, and market considerations. The land use classifications and <br /> densities are compatible with the City's Comprehensive Plan and may be <br /> incorporated as land use amendments to the Comprehensive Plan in late 1985. <br /> They provided a reasonable basis for determining the amount a~d spatial <br /> distribution of future wastewater generation throughout the Service Area. <br /> 3. The land use plan was evaluated over time in order to establish <br /> bui1dout schedules for land uses over a 20-year planning period. Two <br /> independent real estate market studies and an analysis of recent development <br /> trends were used to determine the 1iKely absorption rates for land uses <br /> wtthtn the North San Marcos service area. <br /> 4. Wastewater nows were calculated by mu\tiplying the acreages of each <br /> land use category by Jiving unit equivalents (LUEs). LUEs were calculated <br /> based on the following criteria: <br /> A. too gal\ons per capita-day of average dry weather flow <br /> B. 3 persons per LUE.. or 300 gal1ons per day of average dry <br /> weather flow <br /> C. 1000 ga\1ons per acre-day infiltration/inflow a\1owance for <br /> calculatton of peak wet-weather flow <br /> -2- <br />