Rainwater Harvesting

RAINWATER HARVESTING is the collection, storage and distribution of recycled rainwater, into natural reservoirs or tanks, or the infiltration of surface water into subsurface aquifers (before it is lost as surface runoff), for use in various residential or commercial environments. It’s an important aspect in the wider discussion on sustainability and saving energy, as this eco technology can provide an energy-efficient water system, will improve water supply, food production, and ultimately food security, and even reduce flood risk. Most common uses include water for gardens, livestock, and irrigation, and domestic systems are used to flush WCs, and to supply washing machines (the soft rain is ideal for laundry as it eliminates the need for conditioners).

Not only do we need to gather rainwater, but regulate our overall water usage, too. In an ideal world where energy saving systems are working well, we should eventually be limiting our usage to 80 litres per person per day. This will help reduce emissions, too - the energy needed to treat and pump mains water to our homes and to collect and treat the wastewater is responsible for nearly 1% of the UK’s annual greenhouse gas emissions.

Each year an average house roof collects around 85,000 litres of water, the equivalent of around 450 water butts. Rainwater harvesting systems collect water in a similar way, then pass it through a filter to collect any debris or leaves. The water is stored in a tank above or below ground, then pumped to feed a toilet, washing machine or dishwasher, and using this recycled water would cut our use of mains water by half, thereby saving around 50% on our annual metered water bills.

There are two types of system in use a gravity fed version that needs a header tank, or a direct system that pumps filtered rainwater straight to appliances, but both systems provide innovative and efficient options for saving energy in a variety of environments, and in climates where rainfall levels are high, this is a really viable and effective option. Saving Energy can help you to find the very best solutions for your needs.