What is rainwater harvesting?
Rainwater harvesting (RWH) refers to the collection and storage of rainwater for reuse on-site (usually) rather than allowing it to run off. It is a practice used from ancient times and is suitable for areas with annual average rainfall of more than 400 mm.
Why harvest rainwater?
Modern rainwater harvesting systems – properly managed and maintained – are completely safe and yield good quality water. By using rainwater one can increase water availability and reduce water demand from the water supply network through its subsequent use for non-potable applications, such as toilet flushing, irrigation, car washing, etc., increase soil moisture levels for urban greenery, mitigate urban flooding and improve the quality of groundwater.
How can one harvest rainwater?
Rainwater can be collected from a building roof or other catchment surfaces. Rainwater is then channeled through gutters and pipes to a storage tank. The tank can be made from a variety of inert materials. The preferred location of the storage tank is below ground, sheltered from daylight, as this minimizes algae growth in the stored water.