It means capturing rain where it falls or capturing the run off in your own village or town. And taking measures to keep that water clean by not allowing polluting activities to take place in the catchment.

Therefore, water harvesting can be undertaken through a variety of ways

1. Capturing runoff from rooftops
2. Capturing runoff from local catchments
3. Capturing seasonal floodwaters from local streams
4. Conserving water through watershed management

water harvesting is the process to conserve water and use it when needed

example:- rain water harvesting

the water is collected in a tank and used when there is scarcity of water. this process is mostly performed in the desert areas where it rains once  a year or once in a blue moon