Abstract
The Transfer Tunnel forms part of the Phase 1A of the Lesotho Highlands Water Project. The tunnel has a length of 45 km, an excavated diameter of 5m, and is situated at an altitude of nearly 2000m above sea level. Directly connected to an underground power station, it is probably the longest headrace tunnel in the world. The tunnel is being excavated through basalt and runs in a northerly direction from an intake structure sited on the Malibamatso River, approximately 100 km east of Maseru. The paper describes the planning and design of the tunnel from the Project Optimization stage to the present. Le Transfer Tunnel fait partie de la phase 1A du Lesotho Highlands Water Project. Ce tunnel, dont la longueur est de 45 km et le diamètre excavé de 5 m, se trouve à une altitude de prés de 2000 m. Raccordé directement à la centrale souterraine, il s'agit probablement du plus long canal d'amenée du monde. Le tunnel est creusé dans le basalte et remonte vers le nord à partir d'un ouvrage de prise situé sur la rivière Malibamatso, environ 100 km à l'est de Maseru. L'article décrit la conception et le dimensionnement du tunnel, depuis la phase d'optimisation du projet jusqu'à aujourd'hui.
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