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Updated: Aug 27

Rainwater harvesting is a versatile and effective strategy that offers a wide range of benefits for individuals, communities, industries, and the environment. It plays a crucial role in sustainable water management and resilience building..

⦁ Rainwater is a relatively clean and free source of water, at the point

where it is needed

⦁ It promotes self-sufficiency and conserves water

⦁ It uses a simple technology which makes it easy to maintain

⦁ Provides safe water for human consumption after proper treatment

with low running costs

⦁ Can supplement other sources of water supply

⦁ Reduces flood flows & dependency on ground water

⦁ Improves the quality of ground water through dilution when recharged

⦁ Reduces soil erosion as the surface runoff is reduced

⦁ The structures required for RWH are simple, economical and


⦁ RWH system can also be set up with the already existing infrastructure

⦁ Yields high quality water - pure, soft, with low minerals, free of organic

matter & chemicals

⦁ In coastal areas, where the water is saline, RWH is the panacea

⦁ Saving of energy to lift ground water (One-meter rise in water level

saves 0.40 kilowatt hour of electricity)

"Rain to the Rescue: Harvest, Reuse, Renew."

raise awareness about the importance of rainwater harvesting and encourage people to take action to conserve this precious resource.

Rain Water Harvesting is Most Suitable When

⦁ Groundwater is scarce

⦁ Groundwater is contaminated

⦁ Terrain is rugged or mountainous,

⦁ Seismic & flooding events are common,

⦁ The aquifer is at risk of saltwater intrusion,

⦁ Electricity & water prices are rising

⦁ Water is too hard or mineral laden

Rain Water Harvesting Filtration Process

Filters are made of sponge and a mixture of sand, gravel and charcoal. After

first flushing and filtration water is led into underground sumps (which are

very common in Bangalore) or to a new storage tank. The overflow from this

tank is taken to an open well to recharge the aquifer. The geological formations

are predominantly granite and granitic gneiss, with joints and fractures in

abundance due to intense chemical weathering of rocks. The depth of weathering

varies from 0.2 m to 20 m. This geological set-up offers an immense scope for

recharging of ground aquifers. The undulating terrain with gentle slopes draining

into lakes offers an ideal situation for water harvesting. In the urban area of

Bangalore water bodies cover about 5 per cent of land.

Potential of RWH water availability through Rooftop in Bengaluru City.

Parameter Measure

Total Annual average rainfall 970mm

Total no of rainy days 60 Rainy days

Peak hour intensity of rain in Bangalore 60mm/hr

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