Direct Commercial System

Rainwater Harvesting

What the rain harvesting system does is intercept the water which would normally run off to storm, filter it and hold it in a water storage tank.

The process is straighforward: a rainwater filter is fitted to a downpipe or to below a ground drainage pipe to collect water whilst discarding leaves and other debris. The clean water is stored in a tank and then pumped on demand to dedicated supply points like toilet cisterns, washing machines, garden taps or a utility room. Click Here to View Direct Commercial System Diagram in Full

Whilst the concept is simple, installing reliable systems which give years of trouble free service needs careful design. RHI are the experts with more operational rainwater harvesting systems than anyone else in the UK and Ireland. The company’s installed systems include thousands of private houses, schools, universities, office blocks as well as government buildings to name but a few.

There are two types of systems that can be used – direct and indirect systems. The tank is sized accordingly, taking a number of things into consideration, including the roof area, number of users in the building and the type of roof in existence. From there, the storage tank is pumped to the point of use – direct to toilets, outdoor washing machines, irrigation pumps etc. With the other indirect system, the water is pumped to a header tank, which is at a high level within the building and then gravity fed into the toilets and taps for irrigation. This is a gravity system - the other one is a pressure type system.

Direct Domestic System

The header tank system holds a reserve of water at high level, allowing a degree of contingency and ensuring the pump isn’t working as often. However, tanks don’t have to be at subterranean level; tanks in commercial buildings are often fitted in the basements and RHI has a whole range of tanks to suit a specific site. A storm water system called “Permavoid”, is also now available.

This second generation Sustainable Urban Drainage System is a shallow tank system suitable for places where difficult ground condition exist or there is solid rock. This tank system is extremely strong in fact 1 m2 can bear a weight of 150 tonne, and as a consequence be installed directly below cark parks; ultimately reducing excavation and aggregate backfill costs significantly.

The permavoid system can not only be used to attenuate the sites storm water but also make this water available for use in the building. This is used in a lot of supermarkets, large scale businesses in the UK and across Northern Europe.

Click Here to View Direct Domestic System in Full

To View Rainwater Harvesting CASE STUDY log on to:

http://www.rainharvesting.co.uk/pages/case_studs/cs_studs2.html