Answer :
rain harvesting is the technique use for collection of clothes,storing or using rainwater for drinking and landscape irrigation and other uses.rainwater system come in all shapes and size,simple catchment system under a downspout lager above and or underground cir system with complex filtration system that can store thousands of gallons of water.most rainwater collection system are compressed of the following basic concepts.the rainwater is collected from various hard surface such as roof top or other man made above ground hard surface. this ancient practice is currently growing in popularity throughout our community due to interest is reduce in consumption of potable water and the inherit quantities of rainwater .