Class 10 Biology Management of Natural Resources Water harvesting

Water harvesting

Water conservation increases biomass production.

The aim of water harvesting is to develop primary resources of land and water to produce secondary resources.

Khadins, tanks, nadis in Rajasthan, bandharas, tals in Maharashtra, ahars and pynes in Bihar, surangams in Kerala, bundhis in Madhya Pradesh, eris in Tamil nadu, Kattas in Karnataka are some of the water harvesting system.

                        

Fig. nadi  

Fig. tal

In largely level terrain, the water harvesting structures are crescent shaped earthen embankments; straight concrete and rubble check dams built across seasonally flooded gullies.

The advantages of water stored in ground are-

  • It does not evaporate.
  • Spreads out to recharge wells and provides moisture for vegetation over a wide area.
  • Does not provide breeding grounds for mosquitos.
  • Protected from human and animal waste.

Fig. Ground water  

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