A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Using the Corps of Engineers' Screening Criteria for initial review of spillway adequacy, it has been determined that the dam would be overtopped by all storms exceeding 20% of the Probable Maximum Flood (PMF) inflows. Since failure of the dam would increase the hazard to downstream residents, the spillway capacity is adjudged as seriously inadequate and the dam is assessed as 'unsafe, non-emergency'. Due to the severity of the spillway inadequacy, it is recommended that the stop logs on the drop inlet structure should be removed to lower the reservoir level, and to provide additional spillway capacity. The stop logs should not be replaced until appropriate mitigating measures have been taken. A system for providing around-the-clock surveillance of the dam during periods of unusually heavy precipitation should be developed and implemented. An emergency action plan for the notification and evacuation of downstream residents should also be developed and implemented. It is recommended that within 3 months of the date of notification of the owner, a detailed hydrologic/hydraulic investigation of the structure should be commenced. Mitigating measures deemed necessary as a result of these investigations should be completed within 18 months. Stop logs should not be replaced until appropriate mitigating measures have been completed. Inspection of the three outlet pipes revealed varying degrees of differential settlement along each of the pipes.
Using the Corps of Engineers' Screening Criteria for initial review of spillway adequacy, it has been determined that the dam would be overtopped by all storms exceeding 20% of the Probable Maximum Flood (PMF) inflows. Since failure of the dam would increase the hazard to downstream residents, the spillway capacity is adjudged as seriously inadequate and the dam is assessed as 'unsafe, non-emergency'. Due to the severity of the spillway inadequacy, it is recommended that the stop logs on the drop inlet structure should be removed to lower the reservoir level, and to provide additional spillway capacity. The stop logs should not be replaced until appropriate mitigating measures have been taken. A system for providing around-the-clock surveillance of the dam during periods of unusually heavy precipitation should be developed and implemented. An emergency action plan for the notification and evacuation of downstream residents should also be developed and implemented. It is recommended that within 3 months of the date of notification of the owner, a detailed hydrologic/hydraulic investigation of the structure should be commenced. Mitigating measures deemed necessary as a result of these investigations should be completed within 18 months. Stop logs should not be replaced until appropriate mitigating measures have been completed. Inspection of the three outlet pipes revealed varying degrees of differential settlement along each of the pipes.
National Dam Safety Program. Mechanicville Reservoir Dam (Inventory Number NY 1061). Upper Hudson River Basin. Saratoga County, New York. Phase I Inspection Report
G. Koch (author)
1981
125 pages
Report
No indication
English