Question

How is rooftop rainwater harvesting done?

Answer 1

Rooftop rainwater harvesting is a sustainable water conservation technique that involves an interconnected collecting, filtration, and storage system. The process begins when rainfall falls on a building’s roof, which serves as the primary collection area; this water is then sent through a network of PVC downpipes or conduits to ground level. Before entering the main storage, a first-flush mechanism is utilised to remove the initial rain, which contains accumulated roof dust and debris. The ensuing clean water is sent through a filter tank covered with sand, gravel, and charcoal to remove fine impurities. Finally, purified water is either collected in a big underground masonry storage tank for immediate home use or pumped into a recharge pit to refill the local groundwater table.