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Thursday , 14th November 2019

Rain Water Harvesting (RWH)

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Rainwater harvesting (RWH) is a simple method by which rainfall is collected for future usage. The collected rainwater may be stored, utilised in different ways or directly used for recharge purposes. With depleting groundwater levels and fluctuating climate conditions, RWH can go a long way to help mitigate these effects. Capturing the rainwater can help recharge local aquifers, reduce urban flooding and most importantly ensure water availability in water-scarce zones.

Urban areas face peculiar problems. The high demand consequent on rapid urbanization and paving the road / open spaces with impermeable layer depletes the aquifer systems both in terms of quantity and quality on one hand, while the heavy downpours during too little a period of monsoon leaves the urbanites water logged. To add to this woe is pollutant load of municipal and urban wastewaters that pollutes the aquifer systems. With heavy concretization that is in practice in urban areas, the urban citizens feel that acute water scarcity during summer and flooded streets during winter have become two sides of the coin for them thus leaving urban water management in total distress.

The Rainwater harvesting programme has been successfully implemented throughout Tamil Nadu because of the efforts taken by the State Government in terms of launching the awareness campaign, design of various cost effective RWH structures for adoption, opening up of the Information Centres, training and enlistment of the service providers followed by the issue of the Historic ordinance making it mandatory for all the public to install the RWH structures in their buildings/houses.

The Benefits of Rainwater harvesting

  • Prevention of water wastage by arresting runoff
  • Sustains and safeguards the existing water table
  • Prevents soil erosion
  • Prevents intrusion of saline water to groundwater
  • Improves water quality
  • Increases water availability through recharge
  • Mitigates floods

Rain Water Harvesting Methods:

  • Roof top Rain Water Harvesting (RRWH)
  • Campus RWH (RWH other than Roof area)
  • Storm water harvesting & Defunct Bore well Recharge
  • Defunct Quarry/Mines water usage
  • Restoration and rejuvenation of water bodies
  • Grey water recycling, Reduce & Reuse