The planned maintenance closure of the Lesotho Highlands Water Project (LHWP) tunnels has been extended by three weeks due to technical challenges, according to a statement from South Africa’s Department of Water and Sanitation (DWS) on Wednesday.
Originally scheduled to last from October 1, 2024, to March 31, 2025, the shutdown is facing delays due to maintenance work in the Delivery Tunnel South on the Lesotho side.
Technical Issues Behind the Delay
The implementing agency, the Lesotho Highlands Development Agency (LHDA), encountered unexpected difficulties, including higher-than-anticipated seepage inside the tunnel. A shift from manual to automated sandblasting proved problematic, as high humidity levels disrupted the automated process.
To address the challenge, the contractor has procured additional equipment to manage seepage more effectively. A recovery plan was put in place to accelerate progress, but the delay remained unavoidable, explained DWS spokesperson Wisane Mavasa.
No Water Shortages Expected
Despite the extension, water supply remains stable. Maintenance work on the South African side, overseen by the Trans Caledon Tunnel Authority (TCTA), is progressing as planned and is expected to finish on schedule.
Additionally, the Vaal Dam, a key reservoir in South Africa’s Integrated Vaal River System, is at full capacity (101.51%) following above-normal rainfall, ensuring water availability. Municipalities along the Liebenbergsvlei River in the Free State will also remain unaffected.
The Sol Plaatje (Saulspoort) Dam, currently at 82.1% capacity, can release water if needed to support downstream users.
Project Impact and Future Outlook
The LHWP plays a critical role in supplying water to South Africa, particularly Gauteng province, through a system of dams and tunnels. While the temporary delay extends the maintenance period, officials assure that water security in the region will not be compromised.
