A platform for research: civil engineering, architecture and urbanism
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This report provides information and analysis on the physical condition of the dam as of the report date. Information and analysis are based on visual inspection of the dam by the performing organization. Visual inspection of this dam and engineering analyses which have been performed revealed conditions which constitute a hazard to human life or property. As a result of these determinations the dam has been assessed as 'unsafe, emergency'. Serious leaks through the dam and along the interface between the dam and its foundation were noted. There was overall deterioration of the concrete and masonary sections. A void near the top of the masonry section provides evidence of past overtopping. Stability analyses performed for the structure indicate that under extreme loading conditions ice loading, 1/2 PMF, PMF safety factors against both sliding and overturning are unacceptable (below 1.0). Using the Corps of Engineer's Screening Criteria for the initial review of the spillway adequacy, it has been determined that the structure would be overtopped for all storms exceeding 4% of the Probable Maximum Flood (PMF). Due to the condition of the structure, it is questionable as to whether it could withstand a substantial flow over the crest. Therefore, a flood-wave analysis was performed. This analysis indicates that in the event of a complete breaching of the dam water surface levels downstream could reach depths which pose significant danger to residents. The spillway is, therefore, adjudged as seriously inadequate.
This report provides information and analysis on the physical condition of the dam as of the report date. Information and analysis are based on visual inspection of the dam by the performing organization. Visual inspection of this dam and engineering analyses which have been performed revealed conditions which constitute a hazard to human life or property. As a result of these determinations the dam has been assessed as 'unsafe, emergency'. Serious leaks through the dam and along the interface between the dam and its foundation were noted. There was overall deterioration of the concrete and masonary sections. A void near the top of the masonry section provides evidence of past overtopping. Stability analyses performed for the structure indicate that under extreme loading conditions ice loading, 1/2 PMF, PMF safety factors against both sliding and overturning are unacceptable (below 1.0). Using the Corps of Engineer's Screening Criteria for the initial review of the spillway adequacy, it has been determined that the structure would be overtopped for all storms exceeding 4% of the Probable Maximum Flood (PMF). Due to the condition of the structure, it is questionable as to whether it could withstand a substantial flow over the crest. Therefore, a flood-wave analysis was performed. This analysis indicates that in the event of a complete breaching of the dam water surface levels downstream could reach depths which pose significant danger to residents. The spillway is, therefore, adjudged as seriously inadequate.
National Dam Safety Program. Rainbow Lake Dam (Inventory Number NY18), Upper Hudson River Basin, Hamilton County, New York. Phase I Inspection Report
G. Koch (author)
1979
94 pages
Report
No indication
English