Rainwater Harvesting MethodsThere are mainly two methods of rainwater harvesting,

Surface runoff harvesting
Rooftop rainwater harvesting
1. Surface Runoff Harvesting
This system is most suitable in an urban area where the rainwater flowing along the ground during the rains will be collected to designated water storage. The flow of small tributaries of rivers or reservoirs is redirected to store the surface runoff.

The surface runoff is stored in ponds, tanks, and reservoirs built for this purpose. During the storage of rainwater, efficient and effective water conservation methods (reducing evaporation) are incorporated. Several measures are taken to sustain healthy and hygienic water.

2. Rooftop Rainwater Harvesting
Roof Top Rainwater Harvesting Method can be adopted at individual homes or schools where the rainwater is captured from the roof catchments of domestic houses or commercial buildings, diverts, and stored in the tanks.