Roof rainwater harvesting
Roof rainwater harvesting is a system where water is stored in an underground water tank. Rainwater flowing over the roof is collected, for example, on galvanised iron roofs. The technology is critical in semi-arid environments where water shortages are common.
The water then runs through gutters and a pipe to the underground water tank. To build the underground tank, the ground is excavated, and within this hole, a drum-like feature is built with concrete bricks and mortar, is then sealed and given an opening with a lid. Water is available for multiple purposes, until the following rainy season.