National Dam Safety Program. Dam Number 2. Inventory Number NY 780, St. Lawrence River Basin, Jefferson County, New York. Phase I Inspection Report,
Abstract
Dam No. 2, located near Antwerp, New York, is a concrete and stone work gravity dam and is classified as a high hazard. The dam impounds a small linear reservoir which is used to regulate flow into the Village of Antwerp water supply system. Visual inspections of the dam did not reveal conditions which constitute an immediate hazard to human life or property. No plans were available, however, surveys of the dam were made for this inspection. Additional studies should be undertaken to further evaluate conditions affecting the dam. Seepage has been located under the stone masonry wall of the south end of the dam at the junction of the wall and the bedrock. Stability computations performed on the dam indicate it is unstable under the loading condition of ice, seismic, and hydrostatic uplift forces, with an associated factor of safety against overturning of 0.92. Computations prepared using the Corps of Engineer's Screening Criteria have determined that the embankment would be overtopped for all storms exceeding approximately 1% of the PMF (Probable Maximum Flood). A dam break analysis, assuming a partial breaching of the south dam wall, indicates that water surface levels downstream of the dam would not rise appreciably more than if the dam does not break under high flows. The spillway is, therefore, adjudged as not seriously inadequate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 14, 1980
- Accession Number
- ADA086351
Entities
People
- John B. Stetson
Organizations
- New York State Department of Environmental Conservation