Rain water harvesting is the technique of collecting and storing rainwater in natural reservoirs or tanks. There are two methods of rain water harvesting - surface runoff harvesting, which collects rainwater flowing away on surfaces in urban areas, and roof top rain water harvesting, which collects rainwater falling on rooftops. Surface runoff harvesting diverts surface runoff in urban areas that would otherwise flow away and uses it for recharging.

1. Rain water harvesting

2. Definition of rain water harvesting
•Rain water harvesting is a
technique of collection and
storage of rainwater into
into natural reserviors or
tank.

3. METHODS
There are two types
1.Surface runoff harvesting
2.Roof top rain water harvesting

4. SURFACE RUNOFF HARVESTING
In urban area rain water flow away as surface
runoff. This runoff could be cut and can be
used for rharching