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V-16 I I I I I I I I I I I I I I I I I I I B2. DETAILED EVALUATION OF ALTERNATIVE ~ (DOMESTIC WATER PIPELINE FROM GURLEY RESERVOIRI . 1. Description 2i Proposed Svstem. a. General. There are several decisions to be made regarding this option:. Best method to draw domestic water from Gurley Reservoir. Optimum pipeline routing. Pipeline design, i.e., pressure or gravity flow, material, size, etc. Feasibility of developing hydroelectric power. b. Tappina Gurlev Reservoir. There are four ways that Gurley Reservoir could be tapped. All systems must compensate for variable water depths and freezing problems. option s - Construct a; diversion dam on the outlet channel below the dam, install a headgate and divert water to the domestic water pipe. This requires that theheadgate on the outlet works be cracked open to allow water to trickle out the outlet pipe in winter. option ~ - Install a 6.or 8 inch pipe inside the existing outlet pipe, with a valve in the water tower. option Q - Install a pump in the reservoir, with a pipeline to shore. option g - Install a headgate on the inlet canal. The recommended system is option c, a pump in the reserV01r. This affects the dam the least, which is a major concern of Farmers Water. They have expressed strong objections to any system that would affect the exist~ng outlet or embankments. Flows on the inlet can~l are too variable and unreliable in winter for option d. A suggested method for installing the pump is to utilize a 6- foot diameter concrete pipe which extends from the bottom of the reservoir to above water level. It would be installed in one of the side embankments. A walkway would connect it to the shore and a pipe would; extend to the deepest part of the reservoir (Figure V-C). This concept is similar to the water tower presently used in