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Wolwedans Dam Mossel Bay district, Western Cape

Date: 1989 Type: Dam Style: Engineered Status: Extant   Click to view map Coordinates: 34°00'51.68" S 22°13'44.10" E

Wolwedans Dam is a concrete dam in South Africa located on the Great Brak. The dam is the first single center arch-gravity dam in the world to be constructed of roller-compacted concrete, roller-compacted in layers with induced joints, that is fully reliant on three-dimensional arch action for stability. The 70-m high dam has a vertical upstream face and a stepped downstream face at maximum height of 70 meters above its lowest foundation with an uncontrolled spillway. The reservoir filled to capacity in 1992. The dam serves mainly for municipal and industrial water supply for Mossel Bay as well as the gas-to-liquids refinery PetroSA (Mossgas). See also Wikipedia. Books that reference Wolwedans Dam South African National Committee on Large Dams . 1994. Large dams and water systems in South Africa. Pretoria: SANCOLD. pg 208 & 211, 210 (ill)