Rainwater Harvesting Systems

Capturing rain from roofs, storing it, and using it to reduce demand on other supplies.

Rainwater harvesting collects precipitation that would otherwise run off. It can supply gardens, toilets, cleaning, and sometimes drinking water after treatment.

Basic Components

• Catchment (usually a roof)
• Gutters and downpipes
• First-flush diverter
• Storage tank
• Filtration and optional disinfection

Non-potable uses are simplest. Potable use needs careful treatment and testing.

Global Relevance

Valuable in monsoon and arid climates and in cities managing stormwater. It complements public supply and groundwater protection.

Rainwater harvesting turns a free intermittent resource into a practical buffer against scarcity.