What are the main objectives of rain water harvesting?

Hint: Rainwater is a reasonably safe water source and, with the proper precautions, can also be used for potable purposes. Rainwater contains bacteria, fungi, viruses, and chemicals that can make you ill, and it's been related to disease outbreaks 3-4. The risk of becoming ill from rainwater varies depending on where you live, how much it rains, and the season.

Complete answer:
A rainwater harvesting system, also known as a rainwater collection system or a rainwater catchment system, collects and retains rainwater for human use. Easy rain barrels to more complex structures with pumps, tanks, and purification systems are all examples of rainwater harvesting systems.

The no potable water can be used to irrigate crops, flush toilets, wash vehicles, and even wash clothes, and it can be filtered for human use. With water shortage a major issue in many densely populated areas, rainwater harvesting systems may provide water to households and businesses during dry seasons, reducing the demand on municipal systems.

Rainwater harvesting has two main goals:
1. To satisfy the rising demand for water, and
2. To minimize run-off that clogs drains.
3. To raise the water table underground
4. To minimize contamination of groundwater, and so on

Note: To stop groundwater depletion, Tamil Nadu was the first state to make rainwater harvesting mandatory for all buildings. The project started in 2001 and has since been initiated in all of Tamil Nadu's rural areas. Rainwater harvesting is promoted through posters in Tamil Nadu, including rural areas. Within five years, it had achieved outstanding results, and every state began to look to it as a model. In the five years since its introduction, Chennai's water level has risen by 50% and the water quality has greatly improved.