National Program for Inspection of Non-Federal Dams. Branford Supply Ponds Dam (CT 00116), Connecticut Coastal, Branford, Connecticut. Phase I Inspection Report.
Abstract
Branford Supply Ponds Dam is a stone rubble masonry dam with bedrock outcrop abutments and concrete gatehouse. The total length of the dam is 170 feet, which includes a 62 foot long stone spillway located at the right end of the dam. The dam is 5 feet wide and has a maximum height of 17.5 feet. There is a 12 foot wide by 15 feet long concrete gate house located 55 feet from the left abutment of the dam. There are two 16 inch outlet pipes exiting from the gatehouse, one of which formerly served as a service water pipe. The maximum storage capacity of the dam with water at the top of dam is 202 acre-feet. The present use of the ponds is strictly for recreation. The visual inspection of Branford Supply Ponds Dam indicated that the dam is in fair condition. The inspection revealed extensive seepage was occurring at the masonry joints across the downstream face of the dam. The area along the entire downstream toe is wet and spongy with standing water in some areas. The gatehouse was open to trespass and had several large cracks in the walls and a deteriorated roof slab. In addition, the gate valves were unpainted and ungreased and the gate chamber was flooded. The peak inflow to the dam is 7700 cfs based on a drainage area of 3.85 square miles and a peak inflow factor of 2000 cfs per square mile for rolling terrain. The peak test outflow from the dam is 1600 cfs. The spillway capacity is 450 cfs or 28% of the peak outflow. The dam will be overtopped by 1.75 feet with the resulting pool elevation of 26.35 NGVD for the test flood.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1981
- Accession Number
- ADA143043
Entities
Organizations
- New England District, U.S. Army Corps of Engineers