Everything a rainwater harvesting system needs — the catchment on your roof, the filters and storage in between, and the recharge structures in the ground.
How a system works
A rainwater harvesting system comprises components of various stages — transporting rainwater through pipes or drains, filtration, and storage in tanks for reuse or recharge. The common components involved in these stages are described below.
The components
Every part of the journey, from the roof to the ground. Each system we build is sized to your roof, your soil and how you want to use the water.
The catchment of a water harvesting system is the surface which directly receives the rainfall and provides water to the system. It can be a paved area like a terrace or courtyard of a building, or an unpaved area like a lawn or open ground.
A roof made of reinforced cement concrete (RCC), galvanised iron or corrugated sheets can also be used for water harvesting.
Fitted at the roof to prevent the passage of debris — so leaves and dirt are stopped before they reach the pipes and filter.
Channels all around the edge of a sloping roof to collect and transport rainwater to the storage tank. Gutters can be semi-circular or rectangular and could be made using:
Conduits are pipelines or drains that carry rainwater from the catchment or rooftop area to the harvesting system. They can be made of any commonly available material, such as polyvinyl chloride (PVC) or galvanised iron (GI).
The filter removes suspended pollutants from rainwater collected over the roof. A filter unit is a chamber filled with filtering media such as fibre, coarse sand and gravel layers, removing debris and dirt before the water enters the storage tank or recharge structure.
Charcoal can be added for additional filtration.
There are various options for the construction of storage tanks with respect to their shape, size and material of construction — above the ground or below it, sized to how much water you want to keep.
Rainwater may be charged into the groundwater aquifers through any suitable structures, like dugwells, borewells, recharge trenches and recharge pits.
Some structures promote the percolation of water through soil strata at shallower depth (for example recharge trenches and permeable pavements), while others conduct water to greater depths, from where it joins the groundwater (for example recharge wells). At many locations, existing wells, pits and tanks can be modified as recharge structures — eliminating the need to build anything afresh.
Recharge solutions
Typical specifications from our own designs. Every structure is sized to your site, soil and roof area.
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A compact chamber with a filter bed and a slotted PVC rain pipe that carries filtered rooftop water deep into the soil — ideal for homes and small plots.
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A well ring around a slotted PVC bore pipe with layered filtration, directing rooftop water towards the aquifer.
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Stacked PCC rings under a perforated RCC cover slab form a large well that takes in heavy runoff and lets it soak into the ground.
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Percolation pits linked by a trench around the building let water soak into the ground across a wide area.
Who we build for
From a single house to a factory roof, the same principles apply — catch it, clean it, store it or send it back to the ground.
Rooftop water is filtered into recharge chambers and your open well, keeping your own water source topped up.
Larger roofs need more capacity — such as a 6 × 4 ft main pit feeding a row of 2 × 2 ft recharge pits.
A recharge well paired with 1000-litre storage tanks and a sump, so harvested rain supplies the campus.
Commercial systems for large roofs and paved yards. Watch the video
Looking for the best rain water harvesting? Tell us about your site — the first consultation is free.
