Rainwater harvesting is the collection and storage of rain, rather than allowing it to run off. Rainwater is collected from a roof-like surface and redirected to a tank, cistern, deep pit, aquifer, or a reservoir with percolation, so that it seeps down and restores the ground water. Rainwater harvesting is one of the simplest and oldest methods of self-supply of water for households, and residential and household-scale projects, usually financed by the user.[5] However, larger systems for schools, hospitals, and other facilities can run up costs only able to be financed by owners, organizations, and governmental units.

1. RAINWATER HARVESTING
Jenson Samraj J

2. Rainwater Harvesting
Rainwater harvesting is a technology used for collecting and
storing rainwater
Used for
➢Irrigation
➢domestic and
➢livestock consumption
➢Groundwater recharge

3. History
➢Cisterns was constructed and used
➢Cisterns –The place in which liquids can be stored
➢In India, RWH was first introduced by former CM of AP Chandrababu
Naidu
Fire cisterns

4. TraditionalTechniques
➢They harvested the rain drop directly.
➢They harvested monsoon runoff
➢They harvested water from flooded rivers

5. Rain Barrels
Pros
• Simple
• Least expensive
Cons
• Low water storage due to small size

6. Ceramic Urns
Cons
• Heavier than plastic
• More expensive
• Susceptible to freeze damage
Pros
• Attractive

7. StorageTanks
Pros
• Made of durable UV resistant plastic
•Thinner models are less expensive and lighter weight
Cons
• Lighter tanks are not as durable

8. Filters and Screens
• Leaf screen before down spout
• Filter below leaf screen

9. Filters and Screens
➢Mesh installed at tank water entry

10. Components
Catchment
❖It is by surface which directly receives rainfall and provides water to
the system
❖It may be terrace or courtyard of a building or lawn or open ground

11. Components
Coarse Mesh
❑Should be provided at the mouth of inflow pipe for flat roofs to
prevent the passage of debris

12. Components
Gutters
➢Channels all round the edge of a sloping roof to collect and
transport rainwater to the storage tank
➢May be in semi-circular, or rectangular and made of iron sheet

13. Conduits
➢These are pipelines or drains that carry rainwater from the catchment
to the harvesting system.
➢Made up of PVC or Galvanised Iron or cast iron
Components

14. Quiz
____________ was the first state to make rainwater harvesting
compulsory for every building to avoid groundwater depletion.

15. Thank you