Steenbras River

The upper dam also serves as a reservoir for the Steenbras pumped-storage hydroelectricity scheme which supplements Cape Town's electricity supply during periods of peak demand.

The main catchment has an area of approximately 70 km2, including the dams, and lies between the Hottentots Holland Mountains to the northwest and the Kogelberg to the southeast, in the Cape Fold Belt.

[1] The river mouth is a small valley cut into the narrow coastal strip, with steep rock shores near the mouth and wave-rounded boulder beaches further inshore, and waves reach all the way up the tidal part of the river, which faces directly into the prevailing south-westerly swell.

[2][3] Terrestrial vegetation types recorded from the lower reaches include:[2] Kogelberg Sandstone Fynbos is also found in the catchment.

It is used for the Steenbras pumped-storage hydroelectricity scheme which supplements Cape Town's electricity supply during periods of peak demand.