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LHDA calls on construction companies to attend information briefings

29th May 2017

By: Megan van Wyngaardt

Creamer Media Contributing Editor Online

     

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Water resources development and management organisation, the Lesotho Highlands Development Authority (LHDA), will host a briefing session on June 12, at the Wanderers Club, in Johannesburg, to provide information relating to the Lesotho Highlands Water Project (LHWP) Phase 2 project schedule.

The authority is inviting registered construction contractors and suppliers in Lesotho and South Africa that are interested in offering construction and related services to attend the session, where procurement rules and the extent of construction works to be carried out as part of the LHWP Phase 2 implementation will also be discussed.

Interested companies should have experience in the construction of dams, tunnels, roads, bridges, building and the construction of power supply, as well as the supply of services to construction contractors and subcontractors.

A second briefing session will be held at the Garden Court Marine Parade, in Durban, on June 26.

Those wanting to attend either session, must make a booking through Computicket at a cost of R150.

LHWP PHASE 2
The R22.9-billion Phase 2 of the LHWP will be implemented in terms of two distinct components: a water delivery system to augment the delivery of water to South Africa and a hydropower generation system, including the Polihali dam and the Polihali-Katse tunnel.

The Polihali dam will be built downstream of the confluence of the Senqu and Khubelu rivers and will be a 163.5-m-high concrete-faced rockfill embankment dam wall.

The crest length will be 915 m, with a full supply level of 2 075 m above sea level. A 49.5-m-high saddle dam and a side channel spillway will also be built.

The 38.2-km-long, 5-m-diameter Polihali-Katse dam tunnel will be used to transfer water from the Polihali reservoir to the Katse reservoir.

Water will be abstracted from the Polihali reservoir through two separate concrete bell-mouth intakes on the western side of the Polihali reservoir, in the Khubelu river, 3 km upstream of the confluence with the Senqu.

Water will be transferred through the lower and upper intake tunnels to the intake gate shaft. Both tunnels will be built using drill-and-blast methods and will be fully concrete-lined. Hydraulic control will be effected by the valves in the intake structures.

The Polihali intake gate shaft will be used only for maintenance and water quality control functions.

Where possible, the existing infrastructure constructed in Phase I will be used. This includes access roads, power supply, telecommunication systems and camps.

Significant additional works contracts will be awarded for the construction of all-weather access roads, a bulk power supply network, telecommunications systems and project housing, as well as labour camps at both ends of the transfer tunnel.

A permanent housing development will be established near the Polihali dam and transfer tunnel, which will comprise project offices, residential and community facilities.

This will require extensive infrastructure development before the mobilisation of contractors for the two main works contracts of the Polihali dam and transfer tunnel.

The Polihali intake site will also use the infrastructure employed to construct the Polihali dam and the transfer tunnel. This includes feeder roads and bridges around the reservoir to connect affected communities, power supply systems, construction camps and communications.

The facilities at Katse dam will be used for the Polihali-Katse tunnel construction. Existing facilities will be used to house consultants and construction management teams. Improvements to the water and sewage treatment plants, the clinic and the lodge will be undertaken.

In addition to the main access roads to service the construction phase, other access and feeder roads will be built around the reservoir to connect affected communities using pedestrian and light-vehicle bridges, while a pair of major road bridges will be built over the Polihali reservoir, at Tlhakola, crossing the Khubelu river, and, near Mokhotlong, crossing the Senqu river.

The completion date for Phase 2 of the LHWP is set for 2025.

Edited by Chanel de Bruyn
Creamer Media Senior Deputy Editor Online

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