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<br />27Vl <br /> <br />-, "~~ <br />i <br /> <br />Plan of Development <br /> <br />27,600 cubic feet per second with the reservoir water surface at <br />elevation 4447.0, the top of surcharge capacity. In the design, a <br />surcharge of 576,000 acre-feet plus 384,000 acre-feet of exclusive <br />flood control capacity in combination with a spillway discharge of <br />27,600 c.f.s. and a river outlet discharge of 8,600 c.f.s. was <br />provided to protect against an inflow design flood of 344,000 c.f.s. <br />and a 20-day volume of 1,363,000 acre-feet. Subsequent to this design <br />the reservoir allocations were adjusted to allow 475,000 acre-feet <br />for exclusive flood control and 75,000 acre-feet for joint use for <br />flood control and irrigation. Adjustment of the spillway capacity <br />would be minor, and the design was not changed. Area-capacity data <br />and storage allocations for the reservoir are shown on exhibit 4. <br />Corresponding data shown on exhibit 3 are rounded to the nearest <br />1,000 acre-feet. <br /> <br />The river outlet works would be located near the left abutment. <br />Two 10-foot-diameter circular concrete conduits would lead from the <br />intake to a shaft and gate structure under the dam. Two 10-foot- <br />diameter steel pipes inside two 14-foot-diameter concrete horseshoe <br />conduits would extend from the gate structure to a control house at <br />the downstream toe of the dam. High-pressure slide gates would be <br />provided for each conduit in the gate chamber and the control house. <br />The outlet works would be capable of discharging 8,600 cubic feet per <br />second with the reservoir water surface at elevation 4447.0, the top <br />of surcharge capacity, and would be used along with the spillway to <br />protect tne dam during floods. During normal operation, the outlet <br />works would be used to make releases to the river for downstream users. <br />In a letter dated September 14, 1965, which is appended to this report, <br />the Corps of Engineers indicated that an outlet capacity up to 10,000 <br />c.f.s. would have to be available. ~ne Corps later explained that the <br />10,000 c.f.s. was intended to represent the maximum allowable down- <br />stream discharge to obtain the evaluated benefits and that the designed <br />river outlet capacity was satisfactory. <br /> <br />An outlet for the Fort Morgan Canal would be located near the <br />right abutment and a short distance to the left of the existing Fort <br />Morgan Canal which it would serve. A 9-foot 6-inch circular concrete <br />conduit would lead from the intake to a gate chamber under the dam. <br />A 6-foot-diameter steel pipe inside a 10-foot-diameter concrete horse- <br />shoe conduit would extend from the gate chamber and control house. <br />The capacity would be 350 cubic feet per second with the reservoir <br />water surface at elevation 4351.0, the bottom of the conservation <br />pool. By constructing the concrete conduits first and deferring <br />installation of the gates and steel pipe, the Fort Morgan Canal could <br />be routed through the conduit during construction of the dam without <br />interrupting service. <br /> <br />18 <br />