Rainwater Harvesting | Centre for Science and Environment

Rainwater Harvesting

Training Programme on Urban Rainwater Harvesting, Colombo, Sri Lanka

Centre for Science and Environment (CSE) in collaboration with the Ministry of Water Supply and Drainage (MWS&D), Sri Lanka and Colombo based NGO, Lanka Rainwater Harvesting Forum (LRWHF) organised a three day training programme in Colombo on ‘Urban Rainwater Harvesting’ for Srilankan government officials between 27th and 29th April, 2011.




A rainwater harvesting system comprises components of various stages - transporting rainwater through pipes or drains, filtration,

Best Practices


For details click on the city name







The components of rainwater harvesting systems include: 

(1) catchment 

(2) conveyance or conduit system 

(3) first flush 

(4) filters 

(5) storage or recharge system 


(1) Catchment

Doing Rainwater Harvesting: FAQs

1. What is RWH and why should I do it? 
It simply means catching and holding rain where it falls and using it. You can store it in tanks or you can use it to recharge groundwater. Doing RWH has the following benefits:

  • Meet household water needs especially during periods of scarcity. Rainwater is the purest form of water that doesn’t contain impurities like fluoride, arsenic, etc.

Who can do it for you?


Mr. Dunglena
Verdant Ridge,
Aizwal-796012, MIZORAM


200 Azad Society, Polytechnic Road, Ambawadi, 

Centre for Integrated Development
2nd floor, 96, Azad Society
Nehru Nagar, Ahmedabad, 
Email: cfidahmedabad@yahoo.com

Maintenance & Monitoring

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

Best Practices

Laipuitlang, Aizwal
Laipuitlang is located amidst hilly terrain of Aizwal. The area receives very high rainfall both from the southwest and northeast rainfall. The average annual rainfall of the area is 2049.7 mm and the number of rainy days is 110. The area falls in the high rainfall region of the country. Considering the greater number of rainy days, storage is the best option. Overall there is scarcity of water supply in the region.

Step by Step Process

1. Information collection

A. Types, area and location of catchments

B. Rainfall

C. Geological and Hydrogeological data

D. Water demand

E. Legislation and incentives

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