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Rain Water Harvesting Systems

Rain water harvesting is the process of collecting and storing rainwater in a scientific and controlled manner for future use or for recharging the ground water. Rain water from clean catchments (roof) can be routed properly through suitable conduits into a filter. Filtered water can be stored in storage structures for subsequent use. Surface run off can be used to recharge the ground water. This is achieved by recharge wells and direct or indirect tube-well recharge.

Methods Of Rain Water Harvesting Systems

  1. Roof based Rain Water Harvesting System(RWHS)

Rooftops: If buildings with impervious roofs are already in place, flat & slope roof, the catchment area is effectively available free of charge and they provide a supply at the point of consumption. This water can be stored by filtering water, with adequate filtration systems, depending upon the available catchment area, such as wall mount mechanical filters,(for independent house and small apartments) ancient sand bed filtration system with settlement tank for big apartment, commercial complexs and industries. Same can recharge the Earth or Bore well.

   2. Land based Rain Water Harvesting Systems(RWH) 

    A. Ground water recharge in rural areas

  • Gully plug

  • Contour bund

  • Gabion structure

  • Dug well recharge

  • Bore well recharge

  • Ground water dams e Percolation tank

  • Check dams / Cement plugs / Nala bund e Recharge shaft

  • Sub-surface dykes

  • Lake

  • Pond

    B. Ground water recharge in urban areas

  • Recharge pit

  • Recharge trench

0 Trench with recharge well 0 Storm water recharge well

  • Foot paths

  • Landscape e Parks

  • e Roads

        Benefits of Rain Water Harvesting 

  • Rainwater is relatively a clean and free source of water, at the point where it is needed

  • It promotes self-sufficiency and conserves water

  • It uses a simple technology which makes it easy to maintain

  •  Provides safe water for human consumption after proper treatment with low running costs

  • Can supplement other sources of water supply

  •  Reduces flood flows & dependency on groundwater

  •  Improves the quality of ground water through dilution when recharged

  •  Reduces soil erosion as the surface runoff is reduced

  •  The structures required for RWH are simple, economical and eco-friendly.

  • RWH System can also be setup with the already existing infrastructure

  •  Yields high quality water - pure, soft, with low minerals, free of organic matter & chemicals

  • In coastal areas, where the water is saline, RWH is the panacea

  • Saving of energy to lift groundwater(One-meter rise in water level saves 0.40 kilowatt hour ofelectricity)


Hamsa Enviro Energy Solution

Rain water Harvesting


Bore Well Direct Recharge


Bore well Direct Recharge


Bore Well Indirect Recharge


Rain Water Sand Bed Filtration


Earth Recharging Methods

NEED of RWH system

Water scarcity has become a major problem due to varied reasons. An ideal solution to combat water scarcity is to reuse and recycle the available water. In tune with this, it is cost effective and environment friendly to install the RWH unit in every household. RWH unit captures the rain water which will otherwise flow down the drain and makes it reusable for any purpose whatsoever. The efficacy of RWH lies in making the rain water even potable which means rain water can be used for drinking and even for the purpose of cooking after scientifically treating it.

RWH is most suitable where -

  • Groundwater is scarce

  • Groundwater is contaminated

  •  Terrain is rugged or mountainous,

  • Seismic & flooding events are common,

  • The aquifer is at the risk of saltwater intrusion,

  • Electricity & water prices are rising

  • Water is too hard or mineral laden

Potential of RWH system

The total amount of water that is received in the form of rainfall over an area is called the rainwater endowment of that area. Out of this, the amount that can be effectively harvested is called the water harvesting potential. Among the several factors that influence the RWH potential of a site area, climatic conditions specially rainfall quantity, pattern (region, dry period & storage structure) and the catchment characteristics are considered to be the most important.



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