The intake tower is situated on the south bank of the Gariep Reservoir at Oviston, approximately 19 km upstream of the dam wall. Seen from above, the intake tower is shaped like a four-leaf clover with each leaf containing an inlet gate - all at different levels. In this manner, water can be drawn from different levels to help control the water quality. Each of the four inlets can be sealed to allow complete de-watering of the tunnel for routine maintenance.
With a length of 82,8 km, the 5,35 m diameter tunnel is the longest continuous enclosed aqueduct in the southern hemisphere and the second-longest water supply tunnel in the world.
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Photo taken in Venterstad, South Africa
Misplaced? Suggest new location