National Dam Safety Program. Upper Apple Mountain & Lower Apple Mountain. Dam (Inventory Number VA 18711 and VA 18709), Potomac River Basin, Warren County, Virginia. Phase I Inspection Report

摘要

Upper and Lower Apple Mountain Dams are two impounding structures with the tailwater of the Upper Dam being the reservoir water surface of the Lower Dam. The Upper Dam is an earthen embankment about 351 feet long and 34.5 feet high, while the Lower Lake Dam is an earthen embankment about 377 feet long and 32.9 feet high. The dams are classified as small dams with a hazard classification of significant based on location. The emergency spillway for each dam is an earthen channel located at the left abutment of each dam. Based on criteria established by the Department of the Army, Office of the Chief of Engineers (OCE), the Spillway Design Flood (SDF) is the 100-year flood for each. The emergency spillway of the upper dam will pass 6 percent of the PMF and 100 percent of the SDF without overtopping while the lower dam will pass 4 percent of the PMF and 100 percent of the SDF without overtopping. Therefore, the spillway of each dam is adjudged as adequate.