Author: Walter G. ShifrinPublisher:
ISBN:
Category :
Languages : en
Pages : 130
Book Description
This dam is in the high hazard potential classification, which means that urban development with more than a small number of habitable structures could be affected in the event of failure of the dam. In general, the dam appears to be in poor condition. Benson Lake Dam being a small size dam with a high hazard potential is required by the guidelines to pass from one-half of the Probable Maximum Flood to the Probable Maximum Flood without overtopping. Considering the number of inhabited dwellings, a state highway, and an oil depot being located downstream of the dam, the PMF is considered the appropriate spillway design flood for Benson Lake Dam. The evaluation indicates that the reservoir/spillway system can accommodate the one-percent chance flood (100-year flood) without overtopping. Another major deficiency with this dam is the three scarps observed on the downstream slope on the left side of the embankment and the seepage observed in the area.