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<br />conduit. The conduit must be watertight aind backfilled with <br />native or imported soil with a permeabili~y of less than <br />lxl0-6 em/sec. The conduit must be covere!d with a minimum <br />of 2.5 feet of soil. Any additional measures deemed <br />desirable to contr:>l seepage losses should be concentrated <br />along Zone B on the Uncompaghre River side. <br /> <br />9. Diversion Facilitv, Uncompahqre River, <br /> <br />The purpose cf this section is to outline alternatives <br />to supply water tc the proposed fish pond. The concepts <br />presented herein are intended to serve as ,an aid to the city <br />in evaluating the possible alternatives, their relative <br />costs, and merits. <br /> <br />Obiective Diversion Flows - Diversion from the <br />Uncompahgre River is required to meet seepage, evaporation, <br />and adjacent waterfowl area and irrigation needs. Seepage <br />was estimated to te a maximum of 1.1 cubict feet per second <br />(cfs). The maximum evaporation rate over ,the 70-acre <br />surface area would be 951 gallons per minllte (gpm) or 2.1 <br />cfs. The estimated water demand for the adjacent 20-acre <br />waterfowl site is 1.0 cfs. Irrigation water would be <br />required for the rroposed open space immeqiately north of <br />the pond. This demand was estimated to be a maximum of 150 <br />gpm or 0.3 cfs. 'The resulting total maxintum demand is 4.5 <br />cfs. Therefore, a design flow rate of 5 cfs will be used in <br />this analysis. <br /> <br />This analysis does not include inflows which may be <br />required for water quality. Colorado Division of wildlife <br />personnel have indicated that water quality flows are not <br />needed in a similar fish pond in Montrose,' Colorado_ <br />However, water quality investigations maybe necessary to <br />adequately determine if additional flow requirements are <br />needed for the Delta Pond. In the event tha.t water quality <br />flows are necessary, a 10-cfs design flov/was evaluated in <br />addition to the 5-cfs flow. <br /> <br />Hvdraulic Hea.d Requirements - In order .to avoid <br />substantial costs for the purchase, maint:~nance, and <br />operation of pumps and appurtenances, the diversion from the <br />Uncompahgre River ~ust be made at a location where the water <br />surface in the riv,er will be sufficiently hiqher than the <br />desired water surface in the pond. <br /> <br />The desired water surface elevation for the pond is <br />4,926 feet. The primary concern was whether or not adequate <br />hydraulic head exists adjacent to the pond to permit gravity <br />flow diversion from the Uncompahgre River Jnto the pond. <br />Existing topographic maps indicated that the toe of the <br />right bank was clo'3e to the desired water 'surface <br />elevation. To aid in this determination, the toe of the <br />right bank was surveyed from the Fifth st:reet Bridge <br />downstream to the pond. The current elevation of the right <br /> <br />14 <br />