Rainwater is a free gift of nature and it can be collected easily in small and large quantities by various methods and for various purposes. Harvesting rainwater involves gathering and preserving water from rain before it reaches the wet underground layer of the earth that contains permeable rocks and unconsolidated materials.
In under-developed parts of the world where pure drinking water is not readily available, they adopt the option of gathering water from the roof of their houses. They sometimes process this water mildly, most times by boiling, and then consume it and drinking water and also to cook. The materials used for collecting the rain water are readily available in their local communities. They however, have to cope with the challenge of rainwater storage systems as the rain does not fall all through the year.
Harvesting rainwater can also be done on a larger and more advanced scale. This usually involves using a complex industrial system, such as the below ground tank, which is often regarded as the best option for gathering rain water. The tank traps and preserves subsurface water. A simple calculation can be done to determine how much water and at what rate it can be gathered, by applying a little arithmetic calculation to some parameters. (more...)
