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The rock catchment system is a large scale water harvesting system constructed on a gently sloping hillside. The (bare rock) hillside is the surface from which rainwater is harvested b y a concrete dam. To withstand the force of the collected water, this concrete dam should be reinforced by iron bars, A weir in this dam creates the opportunity to lead water through a metal piping system towards downstream storage reservoirs (masonry tanks). From the tanks, communities can draw water at ‘kiosks’ where the storage level is being gauged.

The length, height and thickness of a weir varies with the size and the slope of the rock catchment area. On avarage, a weir will be 10 meters long, 2 meters high and 0.5 meters thick.