National Program for Inspection of Non-Federal Dams, Brandegee Lake Dam (CT 00153), Thames River Basin, Waterford, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Brandegee Lake dam is a 450 foot long earthfill structure with a concrete core wall. The dam has a crest width of 12 feet, an upstream slope of 21 and a downstream slope of 1.51. The spillway is 28 feet long, has a crest elevation of 129.5 NGVD and a trapezoidal weir. The maximum height of the dam is 15 feet. The dam has a impoundment capacity of 530 acre-feet at the top of the dam elevation of 133.5 NGVD and is used for recreation. The dam is classified as SMALL in size and a SIGNIFICANT hazard structure in accordance with recommended guidelines established by the Corps of Engineers. Based on the size and hazard classifications, the adopted test flood for this structure is equal to one-half the Probable Maximum Flood PMF which is estimated to be 600 CSM, or l,080 CFS, from the 1.8 square mile drainage basin. This test flood has a routed outflow discharge equal to 930 VFS and would overtop the dam by 0.2 feet. The maximum spillway capacity is equal to 785 CFS which represents 84 of the test flood outflow. Based on a visual inspection at the site, the dam is considered to be in FAIR condition. However, these are several areas of concern which must be corrected to assure the long-term performance of this dam.
- Hydrology, Limnology and Potamology
- Civil Engineering