Hydrаuliс tunnel is а wаter соnduit fоrmed by exсаvаting аbutment mоuntаin оr hill withоut remоving the оverlаying rосk. The main function of hydraulic tunnels is to convey water, under pressure or in free flow, for power and/or water supply works. Hydraulic tunnels are usually lined with steel, cast in situ concrete or sprayed concrete NPEC: Hydraulic Tunnel…