Cut-Earth Cradle Method for Installing Conduits Through Earth Dams

A method of installing pipe conduits in earth embankment dams, without use of concrete cradles or other devices, has been successfully used on three dams in West Virginia since 1994 (Anawalt Lake, South Sand Branch, and Chatham Lake dams). Compaction was achieved in the earth material surrounding the pipe prior to placing the pipe. Each pipe was installed on a yielding foundation that can move with the normal settlement of the dam embankment. The pipe materials used at the three dams include Ductile Iron (DIP), High Density Polyethylene (HDPE) and reinforced concrete pipe (RCP). A fourth dam is currently under construction using this technique. This method may be considered as an alternative installation method where conditions and construction methods are appropriate. 9 pp., 3 references.