rain water harvesting is an important method to save surface runoff.give reason
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Explanation:
It reduces soil erosion and flood hazards by collectingrainwater and reducing theflow of stormwater to prevent urban flooding. Most buildings that utilize rainwater harvestingsystems have a built-in catchment area on top of the roof, which has a capacity of collecting large volumes ofwater in case of rainstorms.
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In this method the rainwater is collected on rooftop and is directed to dry tanks Thus, it checks the rainwater from flowing far away and hence , prevents surface runoff and soil erosion
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