Cove Point, MD — Rehabilitation of Failed Corrugated Metal Pipe Spillways


Our purpose is to help customers choose solutions which will insure that the process fits the application and do this reliably and cost-effectively. All information in this Field Report will assist the engineer to reduce cost and minimize future maintenance costs. In addition, this Field Report will help the task of communicating that these are solutions in use today with a proven track records of installation and use.

Many small- to mediumsized dams constructed in the 1960s and 1970s utilized corrugated metal pipe conduits for the principal spillway. Many of these structures have reached the end of their useful life because of deterioration of the pipes by corrosion. This Field Report presents an existing application where deteriorated pipes were rehabilitated using polyethylene pipe for sliplining existing spillways.

Cove Point Dam in Maryland was constructed using corrugated metal pipe (CMP) spillways. This CMP spillway was deteriorating and presented a costly dilemma. Conventional removal of the old conduit and replacement with a new pipe is expensive and time consuming. For a dam of this size (20 feet to 30 feet high) the estimated cost for pipe replacement, including design and constriction, is about $100,000. Thus there was a need to evaluate a less costly repair method.