National Dam Safety Program. Browns Falls Dam (Inventory Number NY 762), St. Lawrence River Basin, St. Lawrence County, New York. Phase I Inspection Report,
Abstract
Examination of documents and visual inspection of the dam and appurtenant structures did not reveal conditions which constitute an immediate hazard to human life or property. The dam, however, has a number of problem areas which should be investigated further. The structural analysis indicates unsatisfactory stability against overturning according to the Guidelines criteria for the cases of the dam subject to forces possible during normal operation (including ice loading) the 1/2 PMF, and the PMF conditions. Under each of these conditions, the resultant of forces acting on the dam is located outside the middle third of the base indicating that tensile stresses would develop in the dam section. Computations prepared according to the Corps of Engineers' Recommended Guidelines for Safety Inspection of Dams establish the spillway capacity as 65% of the Probable Maximum Flood and 130% of the 1/2 Probable Maximum Flood. The hydrologic/hydraulic analysis indicates the spillway would pass the 1/2 Probable Maximum Flood but would be overtopped by one foot during a Probable Maximum Flood event. According to the Guidelines, the spillway is inadequate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 28, 1979
- Accession Number
- ADA077483
Entities
People
- John B. Stetson
Organizations
- New York State Department of Environmental Conservation