A rooftop rainwater harvesting system is a setup that is designed to collect, store, filter and utilize rainwater that falls on the rooftops.

Rainwater harvesting system can vary depending upon the intended use of the harvested rainwater and local conditions.

Rooftop harvesting includes the catchment area, gutters and downspouts, filters and storage systems.

1. Catchment Area: The roof of a building serves as the primary catchment area where the rainwater is collected. The roof should be made up of durable, non-toxic material ideally with a smooth surface which facilitates water flow.
2. Gutters and Downspouts: Gutters are installed along the edges of the roof to collect rainwater and direct it towards downspouts. Downspouts are the vertical pipes that carry the rainwater from gutters to storage systems.
3. Filters: Filters removes the dust and debris that comes along with the rainwater that falls on the rooftop area it can be installed at the end of the downspouts.
4. Storage systems: Rainwater can be stored in various ways such as barrels, drums and tanks. The storage system must have a secured lid to prevent from contamination and breeding of the mosquitoes.