rainwater harvesting | Centre for Science and Environment

rainwater harvesting


Training Programme on Urban Rainwater Harvesting

Date: July 27 - 31, 2010
Every summer, there is a big hue and cry for drinking water in our cities. Rapid urbanization and industrialization is leading to over exploitation and pollution of water resources. It leads to scarcity of water. On the other hand our water demands are increasing day by day.

Front Page Teaser: 

 

Churning Still Water - Briefing Paper on Urban Waterbodies

Urban waterbodies play an important role in flood control, groundwater recharge and water supply to help cities adapt to climate change effects.

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Capturing Rainwater

A way to augment Chandigarh’s water resources

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Front Page Teaser: 

CSE report on city wide rainwater harvesting for Chandigarh as a part of its work as Centre Of Excellence under the Ministry of Urban Development. 

Step by step

Information collection

A. Types, area and location of catchments
B. Rainfall
C. Geological and Hydrogeological data
D. Water demand
E. Legislation and incentives

Study site plan

A. Slope
B. Location of catchments
C. Space available

Technology

A rainwater harvesting system comprises components of various stages - transporting rainwater through pipes or drains, filtration, and storage in tanks for reuse or recharge.

 
Components   
A rainwater harvesting system comprises components of various stages - transporting rainwater through pipes or drains, filtration, and storage in tanks for reuse or recharge.

1) Catchment
2) Conveyance or conduit system
3) First flush
4) Filters
5) Storage or recharge system

Costs

How much will it cost to catch rain?

When community come together to harvest rain, the per-capita investment goes down. For instance, Panchsheel Park Colony about 1000 residents pooled in Rs 4.5 lakh to harvest more than 170 million litres of water annually.

Maintenance and monitoring

Maintenance- the following steps should be adopted to ensure quality of harvested rain water:

  •     Keep all catchments neat and clean
  •  

  •     Don’t allow contaminated water to flow into system
  •  

  •     Put iron/nylon mesh/fine cloth on inlet and outlet pipes and chambers to prevent solid debris from getting into the system
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