National Program for Inspection of Non-Federal Dams. Guilford Lakes Upper Dam (CT 00412), Connecticut Coastal Basin, Guilford, Connecticut. Phase I Inspection Report

摘要

Guilford Lakes Upper dam is a 200 foot long earthfill structure. The earth embankment has vertical walls on the upstream and downstream faces, and has a crest width of 26 feet. The upstream face is a grouted masonry wall and the downstream face is dry masonry. The dam has two adjacent spillways, a low level outlet, and an emergency overflow. Based on a visual inspection at the site, the dam is considered to be in FAIR condition. However, there are several areas of concern which must be corrected to assure the long-term performance of this dam. It is recommended that the owner engage the services of a registered engineer experienced in the design of dams to accomplish the following: (1) Perform a detail hydrologic/hydraulic investigation to assess further the need for and the means to increase project discharge capacity and the ability of the dam to withstand overtopping; (2) Recommend methods to repair or seal the crushed left overflow pipe; (3) Provide procedures for removal of brush, trees, and root systems to a distance of 15 ft downstream from the dam, and select soils to refill any resulting holes. The maximum spillways and emergency overflow capacity is equal to 635 CFS, which represents 14% of the test flood outflow.