Except of the study of rainwater treatment we will also read literature extensively which related to rainwater harvesting system Rainwater harvesting system can help conserve precious water resources

1. Roof catchment system: This system collects rainwater from the roof of a building and stores it in a tank for later use. This is the most common type of rainwater harvesting system and is suitable for both residential and commercial buildings.

2. Surface catchment system: This system collects rainwater from the ground surface and channels it to a storage tank. This system is best suited for areas with high rainfall intensity and low soil infiltration rates.

3. In-ground storage system: This system is designed to store rainwater underground in a tank or cistern. This system is suitable for areas with limited space and can also help prevent evaporation losses.

4. Modular storage system: This system uses pre-fabricated modules to create an above-ground storage tank. This system is suitable for areas with limited space and can be easily expanded if needed.

5. Green roof system: This system uses vegetation to capture and store rainwater on the roof of a building. This system can help reduce the amount of stormwater runoff and improve building insulation.

6. Flood irrigation system: This system uses rainwater to irrigate crops or gardens. This system is best suited for areas with high rainfall and can help reduce the demand for municipal water.

By understanding the different types of rainwater harvesting systems, we can make informed decisions about which system is best suited for our needs and the environment.