Author: PRC CONSOER TOWNSEND INC ST LOUIS MO.

Publisher:

Published: 1978

Total Pages: 93

ISBN-13:

Based on the criteria in the guidelines, the dam is in the high hazard potential classification, which means that loss of life and appreciable property loss could occur in the event of failure of the dam. Three farmhouses, one state highway, and one county road would be subjected to flooding, with possible damage and/or destruction, and possible loss of life. Wyaconda City Dam is in the small size classification since it is less than 40 feet high and impounds less than 1,000 acre-feet of water. Our inspection and evaluation indicates that the spillway of Wyaconda City Dam does not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. Wyaconda City Dam is a small size dam with a high hazard potential required by the guidelines to pass from one-half Probable Maximum Flood to the Probable without overtopping. Since there is a relatively wide valley and little development downstream of the dam, one-half of the Probable Maximum Flood is the appropriate spillway design flood. It was determined that the spillway will pass 46 percent of the Probable Maximum Flood without overtopping the dam. Also, our evaluation indicates that the spillway will not pass the 100-year flood; that is, a flood having a 1 percent chance of being equalled or exceeded during any given year.