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  5. Commercial Rainwater Harvesting

Commercial Rainwater Harvesting

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Commercial Rainwater Harvesting collects and recycles rainwater from the large roof area of non-household buildings to provide a fully sustainable water supply for non-potable use.   Commercial Rainwater Harvesting is a highly efficient water management method. Systems contribute towards reduced reliance on public supplies and lessened stormwater discharge rates. Stormsaver supplies fully intelligent rainwater harvesting solutions which are designed, manufactured, and tested here in the UK.

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Collection – rainwater is collected via the large roof space and channelled into roof drainage points. Roof drainage points should enter the ground via sealed gullies to prevent contamination from surface water which has a higher potential for pollutants.

Pre-tank filtration – As per BS 16941:2024, the British Standard for Rainwater Harvesting, all rainwater will first pass through a mesh pre-tank filter rated to 1000 microns. This pre-tank filter should always be located before rainwater enters the main storage capacity.

Main storage tank – After passing through the pre-tank filter, rainwater enters the main storage tank via a calmed inlet. This prevents the disturbance on the base of the storage tank. Rainwater then passes through a floating suction filter and is boosted internally via a set of submersible pumps.

Internal storage and control panel – The best designs of a rainwater harvesting system will have internal storage capacity where the automatic mains water top-up is located. When there is a drought period and no supply is available, the mains water top-up will continue to provide a water supply to usage points. Our system arrangements overview above shows the different methods of achieving internal storage and controls.

Additional filtration – some projects demand an optional third stage of filtration. This can be either achieved via our low-maintenance automatic backwash. Or via traditional cartridge filters which prevent important components from fine debris.

Water Availability

The UK has an estimated water deficit of 5 billion litres per day in the next 25 years, according to the UK Environment Agency. Rainwater Harvesting reduces the usage of public water supplies by meeting up to 75% of the total water demand within a building with rainwater. 

Importantly, water savings are achieved without any changes to consumption habits from users. 

Discharge Rates

Large buildings provide ample roof space for collecting clean rainwater, allowing this precious resource to be reused to meet the large water demands of non-household buildings. Without reusing rainwater, these large volumes would be sent straight to the over-capacity drainage network. When drainage networks become overwhelmed, untreated sewage is released into surrounding water courses. 

Results

Rainwater harvesting is now commonplace in many types of buildings, including schools, hospitals, distribution centres, leisure venues, and manufacturing facilities.

Rainwater harvesting can even be combined with our on-site attenuation and greywater recycling technologies for buildings with considerably large water requirements. Live monitoring of Stormsaver’s 2,000 installations shows an average water saving of 75 percent. Discover some of our case studies here.

Rainwater Harvesting is achieved in commercial properties through a variety of methods. 

Choosing the right system is crucial. Based on our maintenance expertise, the primary cause of systems failing is inadequate sizing of the internal equipment. While on paper, the system type may appear capable of delivering sufficient flow and pressure, in practice, an undersized system will struggle to meet water demands.