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what was the need for rain water harvesting?

The need for rainwater harvesting are to :

      (i) Meet the ever-increasing demand for water.

      (ii) Reduce the run off of water.

      (iii) Avoid the flooding of roads.

      (iv) Raise the water table of ground water.

      (v) Reduce ground water pollution.

      (vi) Improve the quality of ground water.

      (vii) Reduce the soil erosion.

      (viii) Supplement domestic water requirements during shortage seasons.