It originates just west of Wungong Dam and runs through the granite Darling Scarp to the western portal in Rails Crescent, Wungong. Built by a joint Venture of Clough, Codelfa and Cogefur, and with a length of 3.7 kilometres (2.3 mi), it opened in 1982.[2]
References
^Cunningham, S & Marcos, GW & Mather, RP (1984). The Wungong Tunnel, Metropolitan Water Authority, Perth, Geology and Construction. In Fifth Australian Tunnelling Conference: State of the Art in Underground Development and Construction; Preprints of Papers. 142-152