Polihali Transfer Tunnel Tender

Scope Just as water from Phase Is Mohale reservoir flows through the interconnecting Mohale Tunnel to the reservoir at Katse so will water from the Polihali reservoir flow by gravity through the Polihali Transfer Tunnel on its way to Katse.The envisaged transfer tunnel will be approximately 38km long with a nominal bore of five metres. Both tunnel boring and drill and blast methods will be used to excavate the tunnel.The Polihali Transfer Tunnel works also include the intake works and gate shaft at the Polihali reservoir outlet works and gate shaft at the existing Katse reservoir with underwater connection to the lake access adits to the waterway and associated construction infrastructure. Training LHDA staff for the purposes of operating and maintaining the tunnel is part of the skills and technology transfer element of the tunnel project.Work on the tunnel design commenced in mid-January 2018 and is expected to be completed during 2019. Tunnel construction starts in 2020 with completion and commissioning expected in 2026.