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'i concrete sand will be imported to provide the pro- tection required. The rockfill material is available from the abutments and in the emergency spillway area. Rockfill material will be placed with the larger sizes toward the outside to eliminate the need for riprap. The upstream and downstream slopes will be 2 horizontal to 1 vertical, and the width of the dam crest is 15 feet. 'I " , i D. Outlet Works The outlet works consist of a low-level intake; a principal drop-inlet spillway; an upstream slide gate; a reinforced concrete outlet pipe, and an outlet stilling structure. 1. Reinforced Concrete Inlet Structure A reinforced concrete inlet structure will house a steel slide gate and a trashrack. The slide gate will be operated by a handwheel located at the crest of the dam. The operating rod will be buried beneath and parallel to the upstream slope. /.. Principal Spillway A 30-inch diameter, 12 gauge, close riveted,' asbestos- bonded and asphalt-coated corrugated metal riser pipe will act as the principal drop-inlet spillway, with its crest at elevation 60.0. A standard Kansas trash- rack and baffle plate will prevent entrance of float- ing debris, ,! .. ...:: 3. Outlet Pipe A 3~-inch diameter reinforced concrete pipe will pro- vide 100 cfs outflow from the reservoir. The outlet pipe will be supported on a concrete cradle and will incorporate concrete cutoff collars every 20 feet to prevent piping along the conduit. 4. Stilling Structure A reinforced concrete stilling structure will be pro- vided at the outlet. Baffles will still the water before the.water enters the outlet channel. E. Spillway An emergency overflow spillway capable of discharging a moderate hazard flood will be constructed in the natural saddle to the right of the right abutment. Water will flow along the natural channel to an existing pond, and then return to Arapahoe Creek. -24-