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Question

What are the main aims and objectives of rainwater harvesting?


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Solution

Rainwater offers advantages in water quality for both irrigation and domestic use.

Major objectives and advantages of rainwater harvesting are :

  1. To meet the increasing demands of water
  2. To supplement groundwater supplies during lean seasons
  3. To raise the water table by recharging groundwater
  4. Reducing groundwater contamination.
  5. Reduce flooding and erosion.
  6. Avoiding flooding of roads.
  7. Avoiding flooding of roads.

What is Rainwater Harvesting?

The method of capturing and storing rainwater is known as rainwater harvesting.

Rainwater Harvesting – Methods

Different rainwater harvesting methods are

  • Harvesting through recharge wells
  • Harvesting through service wells.
  • Harvesting through rooftops.
  • Harvesting through lakes
  • Harvesting through watershed management.

In Rajasthan, the traditional rainwater harvesting structures are locally known as Tanka or Kund.

In rural areas, traditional rainwater harvesting is done by using surface storage bodies like irrigation tanks, lakes, ponds, etc.

Water Sustainability

Due to the reduction in the groundwater table, and pollution of water, there is a problem to meet the ever-growing demand for water. The rising demand is due to an increase in consumption which is driven by rising in population and increasing development.

Although 70% of the earth’s surface is covered with water, a major portion of it is in seas and oceans, which cannot be used due to their high saline content. The desalination plants are very expensive. Hence some of the techniques that are used to meet the demand for water are given below:

  • Watershed development
  • Rainwater harvesting
  • Water recycling and Reuse.
  • Policies to prevent water pollution.

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