National Program for Inspection of Non-Federal Dams. Lake Dawson Dam (CT 00319), Connecticut Coastal Basin, Woodbridge, Connecticut. Phase I Inspection Report.
Abstract
This earth embankment dam is approximately 960 feet long and rises approximately 48 feet above the downstream bed of the West River. A concrete corewall apparently runs the length of the dam. The concrete spillway at the left end of the dam is a 110 foot long broad crested weir with a vertical-sided concrete channel leading to a steep-sided channel cut into natural ground. An upstream gatehouse near the right end of the dam houses the regulating outlets which consist of 2-36 inch cast iron low level outlets, a 36 inch supply main to the treatment plant immediately downstream of the dam, and an 8 inch well drain. Based upon the visual inspection at the site and past performance, the dam appears to be in good condition. No evidence of instability was observed in the embankment, spillway, spillway channel, or other appurtenances. Based upon the size (Intermediate) and hazard classification (High) of the dam in accordance with Corps of Engineers Guidelines, the test flood will be equivalent to the Probable Maximum Flood (PMF). Peak inflow to the reservoir is 20,100 cfs; peak outflow is 19,000 cfs with the dam overtopped 1.7 feet. Based upon our hydraulic computations, the spillway capacity is 9900 cfs, which is equivalent to 52 percent of the routed test flood outflow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1979
- Accession Number
- ADA144158
Entities
Organizations
- New England District, U.S. Army Corps of Engineers