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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />CHAPTER 4 <br />WATER <br /> <br />4.1 <br /> <br />Water Requirement: <br /> <br />Water requirements for lands in the East Divide Creek b.o,sin include both <br /> <br /> <br />commercial irrigation and rural domestic use, including domestic wells. <br /> <br /> <br />Agricultural requirements to provide a full supply are given in Table 4.l. <br /> <br /> <br />Residential demands are given in Table 4.2. <br /> <br />4.2 Water Supply: <br /> <br />A gauging station has been maintained from 1960 to 1965 on East Divide <br /> <br /> <br />Creek approximately 5 miles above its mouth. Copies of these records are <br /> <br /> <br />included in Appendix B. The location of the gauge was above the major <br /> <br /> <br />diversions from the creek at an elevation of 6650 feet. The elevation at <br /> <br /> <br />Alsbury Reservoir is 9,042 feet. To obtain an estimate of runoff at that site a <br /> <br /> <br />correlation has been made with the gauge on Buzzard Creek below Owens Creek, at <br /> <br /> <br />elevation 8,200 feet. The period of record for the gauge was from 1956 through <br /> <br /> <br />1970. The locations of the East Divide gauge, the Buzzard gauge, and Alsbury <br /> <br /> <br />Reservoir are shown on Figure 4.1. Also shown are isoheyetal lines showing <br /> <br /> <br />average winter precipitation. (Source: USGS - Professional Paper 442, 1965). <br /> <br /> <br />Based on a a weighted average of precipitation per unit area above the Buzzard <br /> <br /> <br />gauge and the area tributary to Alsbury Reservoir, the inflow per acre to <br /> <br /> <br />Alsbury during the spring runoff season is estimated to be 75% of the runoff per <br /> <br /> <br />acre at the Buzzard gauge. On-site measurement of East Divide Creek at the <br /> <br /> <br />reservoir site during fall of 1988 after a prolonged drouth indicated a minimum <br /> <br /> <br />inflow of 1/4 to 1/2 cfs. A base winter inflow of 1/4 cfs has therefore been <br /> <br /> <br />included in the determination of storable inflow. In its lower reaches, the <br /> <br /> <br />creek normally goes completely dry; thus, there is no minimum in-stream flow <br /> <br /> <br />requirement. <br /> <br />Calculations of monthly inflow to Alsbury Reservoir for the months of <br /> <br /> <br />April, May and June for the period of record of the Buzzard gauge (1956 - 1970) <br /> <br /> <br />are presented in Appendix B. Historic diversion from East Divide Creek for the <br /> <br /> <br />years 1986 through 1988 are also included in Appendix B. While the volume of <br /> <br />-5- <br />