National Dam Inspection Program. Bear Gulch Pond Dam (NY 01089), Mohawk River Basin, Town of Summit, Schoharie County, New York. Phase I Inspection Report

摘要

Examination of available documents and visual inspection of the dam revealed conditions which constitute an immediate hazard to human life and property. The dam is assessed as 'unsafe, emergency' for the following reasons: (1) A major, active slough on the downstream side of the embankment near the left abutment which gives reason to conclude that the dam is in imminent danger of failure; (2) Large seepages, of about 50 gallons per minute each, which are taking place at a location between the reservoir drain (outlet pipe) and the right abutment, and from around the outside of the outlet pipe itself; and (3) Spillway capacity which is considered (seriously inadequate' in accordance with Corps of Engineers' screening criteria for review of spillway adequacy. Hydrologic and hydraulic analysis indicates that maximum spillway discharge capacity is only about 5% of the PMF peak outflow. The 1/2 PMF would overtop the earth embankment and would probable cause failure. It is judged that failure due to over-topping would significantly increase the hazard to loss of life downstream from that which would exist just prior to failure.