UNSTABLE ROCK AND ITS TREATMENT SNOWY MOUNTAINS SCHEME
Table 1
Tunnels longer than one mile

Note: All tunnels operate as pressure tunnels except Murrumbidgee-Eucmbene which operates as a free-flow tunnel. “Granite” includes granodiorite and granitic gneiss; metasediments are chiefly slatey shale, siltstone, hornfels, fine-grained sandstone grading into quartzite.
* Excavation complete, final treatment in progress 1964. U.C. = Under construction, excavation in progress 1964. N.U1.= Nominally unlined.