Tunnelling for the new Lenihan outlet

摘要

The Lenihan Dam Outlet Modification Project includes the construction of a new tunnel outlet at the Lexington Reservoir, in Los Gatos, California. Owned and operated by the Santa Clara Valley Water District, the Lenihan Dam's original steel lined outlet has buckled over the years, requiring numerous repairs. This led the California Department of Water Resources, Division of Safety of Dams (DSOD) to restrict peak discharge to 2m~3/sec, compared to the previous 11.5m~3/sec. The new conduit will consist of a 1.37m (54") concrete lined steel pipe, sited inside a 610m long maintenance tunnel running through the eastern abutment of Lenihan Dam.