National Program for Inspection of Non-Federal Dams. Halchek Pond Dam (CT 00677), Shetucket River Basin, Willington, Connecticut. Phase I Inspection Report.
Abstract
Halchek Pond Dam is an earth embankment, approximately 18 feet wide at the crest, 760 feet long and 26 feet high above the stream bed. Both the upstream and downstream slopes are approximately 1V:4H. A reinforced concrete spillway is located at the left abutment and is designed to support a bridge. An emergency spillway is located at the right abutment and consists only of an open earth cut. The crest of this emergency spillway has been raised approximately one foot with loosely placed earth fill, and flashboards have been installed on the reinforced concrete spillway to raise the water level in the pond. The outlet works consist of a high level and a low level outlet. The low level outlet is a box culvert passing through the approximate center of the dam, with a gate structure built as a drop inlet on the upstream end. The high level outlet consists of a 6 inch diameter pipe traversing the dam near the right abutment with a gate valve on either side of the crest. As a result of the visual inspection, hydrologic and hydraulic computations and the review of data available, the dam is considered to be in FAIR condition. To assure the long term performance of this structure, the following items of concern require attention: the extensive seepage observed downstream of the dam could represent a threat of piping under unfavorable foundation soil conditions; the emergency spillway channel may direct flow against the downstream toe, which could result in erosion of the dam; the construction method of the emergency spillway is inadequate; and the growth of small trees on the upstream slope could cause increased seepage in the future.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1981
- Accession Number
- ADA144582
Entities
Organizations
- New England District, U.S. Army Corps of Engineers