Rain Water Harvesting

Rain Water Harvesting is an act of accumulating and storing rainwater for reuse. We can utilize this water for various purposes after going through the necessary purification process.

How much rainwater can be harvested?
The total amount of water that is received in the form of rainfall over an area is called the rainwater endowment of the area. Out of this, the amount that can be effectively harvested is called the water harvesting potential.

Water harvesting potential = Rainfall (mm) x Collection efficiency

The collection efficiency accounts for the fact that all the rainwater falling over an area cannot be effectively harvested, because of evaporation, spillage etc. Factors like runoff coefficient and first-flush wastage are taken into account when estimating the collection efficiency, established your application needs first few questions to ask. How clean is the water you plan to use?

Will it come directly from roof or other containment area? A preliminary means of filtration to eliminate large debris should be considered. The containment vessel is the next consideration. How big? Where will it be located? These questions determine the equipment required. Now you can prepare the hydraulic requirements. Calculate friction and elevation needs to establish a system total discharge head. Does your application require another set of filters? How small the solids in the material you need are pumped?

Rain Water harvesting Methods
Rainwater harvesting can be harvested using different methods. It may follow surface harvesting methods or rain water collection methods such as:

  • Rooftops
  • Paved and unpaved areas
  • Water bodies
  • Storm water drains

Literature

Rain Water Harvesting by Tigerflow Systems

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