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The primary purpose of rainwater harvesting is to keep the rainwater conserved to recharge the underground water and store the surplus available water for the crisis. Rain falls everywhere, but it must not be allowed to run or roll downwards. The conserved harvested water must be lifted using shallow or deep tube-wells. Rainwater harvesting provides numerous purposes for everyday routine. 

The stored water is used for agricultural purposes or filtered to be used as drinking water. Rainwater harvesting can be used to store water under the surface or in a reservoir. The stored water is later used with the use of containers, or tubes, or pipes. Rainwater can also be filled in canals, big ditches, watercourses, or ponds, to replenish the water storage. 

With the water crisis becoming a significant issue, rainwater can help recharge stored water and ensure water availability in scare zones. Rainwater harvesting can be practised in apartments as well as in individual homes. To function well, rainwater harvesting systems have to be designed performed and maintained to ensure and maintain the quality of water. The harvested water needs to be purified and filtered before consumption or for other purposes.