Rainwater harvesting
Large commercial properties consume significant quantities of water supplied by the local water company. This water is becoming more expensive and only a small proportion is subsequently used for direct potable use.
Harvesting rainwater appropriately, as part of a complete water management project including water audit, leak repair and installation of water management devices, can save up to 75% on potable water bills.
Recycling rain water instead of potable water for flushing toilets, cleaning processes, irrigation etc reduces pressure on our environment and helps to conserve valuable drinking water resources.
Rainwater harvesting products: Design, Supply and Installation
Waterscan provide free rainwater harvesting surveys to evaluate patterns of water usage on site and suggest water conservation measures that can be introduced along with a suitable rainwater harvesting system. Such a system could be provided as a complete package including design, installation and commissioning. Central to the process are a range of rainwater harvesting WaterManager products which are compact engineered units with all mains components housed in a single enclosure cabinet, including:
- integral break tank
- pumps
- filtration
- instrumentation,
- ancillary equipment
- control system.
Water Technology List
Waterscan’s WaterManger rainwater harvesting products are included on DEFRA’s Water Technology List, which means clients can claim Enhanced Capital Allowances. The ECA programme enables UK businesses to claim 100% first year capital allowance on investments in environmental technologies such as the WaterManager rainwater harvesting system. Businesses are now able to write off the whole cost of their rainwater harvesting management system against their taxable profits.
Rainwater harvesting products: System Description
The entire system comprises of two components: a storage tank with integral filter and a rainwater manager (WaterManager) to deliver rainwater to the point of use.
Rainwater collection flows off the roof and over a self cleaning filter within the tank. The filter prevents large particulates from entering the storage tank and has a very high efficiency and self cleaning effect. Only filtered and aerated rainwater enters the tank.
In addition to the filter, the storage tank also contains an over flow siphon, calmed inlet and special submersible pumps which ensures that the cleanest water is always extracted. These pumps supply rainwater into an intermediate tank inside the Aqua Controller. The system is placed inside the building and controls the flow to the point of use.
When the rainwater tank is low, the Aqua Controller will automatically switch to mains water which is fed into the system via an EN 1717 AA air gap. Separation of the main and rainwater ensures continuity of supply and good water quality.
