Rainwater Harvesting

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Rainwater Harvesting

Rainwater Harvesting

Under the heading of UV water treatment from DaRo UV Systems, rainwater harvesting is considered to be one of the fasted-growing eco-friendly and environmentally sustainable systems of water usage readily available.

According to Wikipedia, a definition of Rainwater Harvesting is:

“Rainwater harvesting is the gathering, or accumulating and storing, of rainwater. Rainwater harvesting has been used to provide drinking water, water for livestock, water for irrigation or to refill aquifers in a process called groundwater recharge. Rainwater collected from the roofs of houses, local institutions, or from specially prepared areas of ground, can make an important contribution to drinking water”.

Water is likely to be one of the major issues for the 21st century, with water sources causing international conflict, and environmentally, it is believed that the current water extraction systems are causing many severe environmental problems. A report by the Environment Agency, published in 2008 warns that Britain’s rivers, “which provide 70% of our water”, will drop 10 to 15% in volume within 40 years. “Householders need to reduce water consumption by a third”.

Rainwater harvesting is both economic and eco-friendly, so much so, that the May 2008 Code for Sustainable Homes encourages the installation of rainwater harvesting solutions.

Rainwater systems are often simple to construct and are potentially successful in most habitable locations, and there are a number of types of systems to harvest rainwater ranging from very simple to the complex industrial systems. Generally, rainwater is either harvested from the ground or from a roof, and is utilising a valuable resource that would otherwise, simply go down the drain.

Most rainwater harvesting systems are simply divided into domestic, garden and commercial and can literally be as simple as a water butt attached via a diverter in a drainpipe.

The Water Technology List (WTL), developed and managed by Defra and HM Revenue and Customs, in partnership with Envirowise, offers a real incentive for industry to invest in technologies that use water sustainably.

Modelled on the Government’s Enhanced Capital Allowance (ECA) scheme for approved energy saving products (www.eca.gov.uk), it enables businesses to claim 100% first year capital allowances on investments in technologies and products that encourage sustainable water use. Businesses are now able to write off the whole cost of their investment against their taxable profits in the period during which they make the investment.

The popularity of the WTL continues to grow and in response to new technology applications received, rainwater harvesting equipment was officially added to the list in August 2004 and includes the following sub-technologies:

  • Rainwater filtration equipment
  • Rainwater storage vessels
  • Monitoring and control equipment
  • Rainwater treatment equipment

This technology is applicable in all areas of water use across industry and commerce. With increasing water supply and discharge costs this technology category could offer the potential for businesses to make significant savings.

Rainwater can be used for the garden, washing the car, showering, flushing the toilet, the washing machine, and even drinking, if treated with UV light. As rainwater may be contaminated, it is often not considered suitable for drinking without treatment. Rainwater harvested from roofs can contain animal and bird faeces, mosses etc, windblown dust, particulates from urban pollution, pesticides, and inorganic ions from the sea, and dissolved gases.

Rainwater may be used for drinking if you install a UV sterilisation unit; the unit is switched on permanently and uses c. 40 watts. This unit will need two filters before the water reaches it – 25 and 5 microns, otherwise micro-organisms can ‘hide’ behind particles.

With many years of experience behind us DaRo UV Systems can advise and offer suitable and economically viable systems to assist you in you rainwater harvesting aspirations.

To learn more about Roof catchment systems, subsurface dykes, groundwater systems, aquifers, groundwater recharge systems, and UV water treatments, contact DaRo UV Systems Ltd – Today

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