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Rainwater Harvesting System

Rainwater harvesting is the collection, treatment and storage and reuse of rainwater.  With increasing water usage, rainwater harvesting provides an environmentally-friendly and economic alternative to the use of mains water for potable or grey water supply and garden irrigation.

The worldwide demand for fresh water has tripled over the last 50 years and is increasing by 64 trillion litres a year*. Closer to home, water and sewerage bills have increased by 40% since the water companies were privatised in 1989.

Harvesting rainwater captures the free, naturally soft, water that falls on your roof and stores it for re-use later. Typical uses include:

Garden irrigation & washing cars (7% of domestic water usage)
Toilet flushing (30% of domestic water usage)
Clothes washing (13% of domestic water usage)
Personal washing (33% of domestic water usage)

*Aquastat – The Food and Agriculture Organization of the United Nations.


Capturing surface water where it lands and efficiently managing its transport avoids the potential for flooding.


Contamination by oil, chemicals and silts can have a serious impact on the receiving water body. Filtration and separation ensures surface water runoff quality objectives are met.


Managing runoff rates and volumes requires on-site attenuation and storage in green or manufactured structures.


Infiltration, flow control devices and pumps control the rate of release of water from storage to the receiving water body.

WCI is an independent supplier and installer of rainwater harvesting systems. We take into consideration the available catchment areas, the required usage, the available space and ground conditions and budgets.

Graf Carat

PremierTech Aqua

Klargester Gamma