National Dam Safety Program. Mead Reservoir Dam (Inventory Number N.Y. 237), Lake Champlain Basin, Clinton County, New York. Phase I Inspection Report,
Abstract
Visual inspection of this dam did not reveal conditions which constitute an immediate hazard to human life or property. However, the dam has some deficiencies which require further engineering investigations. An area of concentrated seepage was noted at the downstream toe of the embankment. This area was approximately in line with the concrete gate house. Seepage was emerging at a rate estimated to be 10 to 20 gallons per minute. While only one area of concentrated seepage was noted, the entire area beyond the downstream toe was wet and swampy. Water was flowing out of the hillside in several areas immediately downstream of the embankment- right abutment contact. The structural stability analysis performed for the spillway section indicates that safety factors are below recommended values for all conditions studied. The sliding safety factors for severe loading conditions such as ice loading or flood flows indicate that the section would be unstable if subjected to these loads. It is recommended that within 3 months of the date of notification of the owner, investigations into the seepage and structural stability problems should be commenced. Remedial measures which are required based on these investigations should be completed within 18 months. The hydrologic/hydraulic analyses performed indicate that the outflows from all storms exceeding 54% of the Probable Maximum Flood (PMF) will result in flow over the emergency relief weir segment of the embankment. The dam does have the sufficient spillway capacity to pass one-half the PMF without the embankment being overtopped. Therefore, the spillway capacity is rated as inadequate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 26, 1981
- Accession Number
- ADA105761
Entities
People
- George W. Koch
Organizations
- New York State Department of Environmental Conservation