Rain Water Harvesting is the gathering, accumulation or storing of rainwater and it has been used to provide drinking water for irrigation and livestock.
All water collected from the roofs of buildings can make an important contribution to drinking water in places where the rain water is the only source available.
Rain Water Harvesting systems are simple to construct from inexpensive local materials and are usually very successful in most habitable locations. It might seem strange to you, but Roof rain water is usually of good quality and does not require treatment before consumption.
There are a very wide types of Rain Water Harvesting systems to choose, from the most simple to complex, but all of them have in common the fact that it collects the water from the roof or floor, and differing only in its efficiency.