Why should we practice rain water harvesting? 

Rain water harvesting should be practised because it is an effective method to deal with the problem of water scarcity. Rainwater harvesting store surface run off rainwater which could be used during the time when water is scarce. The best thing about rainwater is that it is free from pollutants as well as salts, minerals, and other natural and man-made contaminants. Storing of rainwater in underground tanks also recharges ground water table.