Mohale Tunnel
The Mohale Tunnel is part of Phase 1B of the Lesotho Highlands Water Project and is designed to transfer an averag of 9.5 m³/s from the Mohale Reservoir to the Katse Reservoir.
Client:
Lesotho Highlands Development Authority, Maseru
Period:
1983 - 2005
Services:
- Feasibility study 1983 - 1986
- Tender design 1995 - 1997
- Construction supervision and detailed design 1997 - 2005
Technical data:
Water Conveyance Tunnel from Mohale Reservoir to Katse Reservoir
- Length/inner diameter: 32 km/4.00 m
- Discharge: 9.5 m³/s average
- Maximum cover: 1,150 m
- Rock formation: basalt lava flows
- Lining: precast concrete segmental lining with 0.25 thickness
- Excavation method: double shielded telescopic TBM
- Excavation diameters: 4.88 m and 5.38 m