The Orange river, forming the boundary between the Northern Cape and the Free State, is many miles from the ocean yet its flow fluctuates daily. While it appears to be tidal, this fluctuation is in fact man made. It is caused by the opening of hydro electric sluice gates at Vanderkloof dam upstream. The schedule of opening sluice gates depends upon Eskom’s needs at the time, and while it is usually predictable, it can be […]