Question

State any three reasons for rainwater harvesting in metropolitan cities.

Answer 1

1. Augment local water supply and recharge groundwater: Collected rainwater (e.g., rooftop harvesting and recharge pits) percolates to aquifers and can supplement municipal or groundwater sources, helping reduce over‑extraction.
2. Reduce urban flooding and stormwater runoff: Capturing runoff during heavy rainfall lowers peak flows, prevents erosion and lessens pollution carried into drains and water bodies.
3. Conserve water and improve resilience during dry periods: Stored or recharged rainwater provides a local supply for non‑potable uses and irrigation, easing demand on treated supplies and helping cities cope with seasonal shortages.