Abstract
Abstract : Sunshine Lake Dam is an earth embankment with a principal spillway, auxiliary spillway and an outlet works. The principal spillway consists of a rectangular concrete chute located at the left end of the dam and discharging into a small lake located immediately downstream from subject dam. The auxiliary spillway consists of a drop inlet located near the right end of the dam and discharging through a 12-inch concrete culvert into the above mentioned downstream lake. The outlet works consists of a rectangular discharge channel formed by concrete and cinder block walls which transversely penetrate the dam. Flow through the discharge channel is controlled by timber stoplogs which also serve as an additional auxiliary spillway. Based on visual inspection, past operational performance and Phase I engineering analyses, Sunshine Lake Dam is assessed as being in fair overall condition. Hydraulic and hydrologic analyses indicate that the spillways are inadequate. Discharge capacity of the spillways is not sufficient to pass the designated spillway design flood (100-year storm) without an overtopping of the dam. The spillway are capable of passing approximately 3 percent of the spillway design flood.
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