Dams : Spillways

Rehabilitation of eroded spillways.

GaMabintane, Limpopo, South Africa - Client : Africare SA - Designed and built by Dams for Africa, December 2002

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(1) The Village dam's spillway, which is cut into dispersive clay, was seriously eroded.

(2) The rehabilitated spillway - a 1,5m deep trench was excavated and filled with concrete as a cut-off. The trickle flow is now directed to the opposite side of the spillway - where the original channel had suffered minimal erosion.

(3) The Poplar dam's spillway, also cut into dispersive clay, was also seriously eroded.

(4) The rehabilitated spillway - floodwaters are now channelled to a 1,5m gabion weir and the energy of the falling water is dissipated on gabion mattresses in front.