Accession Number:

ADA143976

Title:

National Program for Inspection of Non-Federal Dams. Somersville Pond Dam (CT 00273), Connecticut River Basin, Somers, Connecticut. Phase I Inspection Report.

Descriptive Note:

Corporate Author:

CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV

Personal Author(s):

Report Date:

1980-08-01

Pagination or Media Count:

81.0

Abstract:

The dam at Somersville Pond is a masonry structure with earth abutments that has an overall length of 185 feet, of which 96 feet is the overflow stone masonry concrete capped spillway, and a height of 21.5 feet. The dam appears to be founded on ledge. The dam is presently used for recreation and limited hydro-electric power. The dam has two outlet works gates, one of which is located at the left spillway abutment and the other is located at the right spillway abutment, both of which could not be measured because of the water level at the time of the inspection. Discharges from the right outlet works flow through a covered reinforced concrete culvert to a penstock and turbine. The left outlet works gates appear nonfunctional and abandoned. All outlet works discharges flow back into the Scantic River. As a result of the visual inspection at the site, the dam is considered to be in POOR condition. Deficiencies observed include the inoperable outlet works gate trees and brush located on embankments and spillway abutments dislodged stone work at the right outlet works gate spalled and cracked spillway abutments and seepage at the right spillway abutment. This test flood has an outflow discharge equal to 11,200 CFS and would overtop the dam by about 4.77 feet therefore, the existing spillway capacity is considered to be inadequate and cannot meet the spillway design flood screening criteria. The maximum spillway discharge of 2,750 CFS represents only 25 percent of the test flood outflow.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE