Accession Number:

ADA142702

Title:

National Dam Inspection Program. Pemberwick Dam (CT 00042). Southwestern Coastal Basin, Greenwich, Connecticut. Phase 1 Inspection Report.

Descriptive Note:

Corporate Author:

CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV

Personal Author(s):

Report Date:

1980-02-01

Pagination or Media Count:

98.0

Abstract:

This dam is a masonry arch approximately 115 feet long, 45 feet high with an average top of dam width of 8 feet. The dam was built about 1867 and presently serves no function except an aesthetic one. Based on the visual inspection and past operational performance, the dam is judged to be in Fair condition. Seepage was noted on the downstream face. The emergency outlet works are inoperable and there is no method of lowering the water level. This dam is classified as INTERMEDIATE in size and a High hazard potential structure in accordance with recommended guidelines established by the Corps of Engineers. The test flood for this dam is the Probable Maximum Flood PMF. The test flood has an outflow discharge equal to 25,600 cfs and will overtop the dam by 17.0 feet in a stillwater condition. The maximum outflow capacity of the spillway under a stillwater condition is 1,100 cfs, which is 4 percent of the test flood. It is recommended that the following items be studied further. The downstream leakage, the toe and the upstream face, and the spillway capacity.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE