Commercial & Non Household Active Attenuation

The Stormsaver Active Attenuation system combines Attenuation and Rainwater Harvesting in one system which can be either an above or below ground arrangement. The Stormsaver Active Attenuation system counts towards 100% of attenuation volumes on-site at the same time as Harvesting Rainwater.

This is made possible by connecting your Rainwater Harvesting tank and attenuation system via pipework allowing stored rainwater to be drained down before a storm event. Your Rainwater Harvesting System becomes part of your attenuation capacity, meaning you can reduce the number of attenuation crates/tanks used.

Half of the attenuation tank collects surface water run-off and acts just as a regular attenuation tank, while the other half collects roof run-off and stores it within the Rainwater Harvesting System. The Active Attenuation technology is directly linked to a highly accurate, short to medium term Met Office Rain Prediction System. When rainfall is predicted, Stormsaver’s telemetry recognises the anticipated rainfall event.

The system measures the water levels with the integrated level sensor in the storage tank, then controls water levels within the attenuation and Rainwater Harvesting tanks, by controlling a low level valve or attenuation pumps. This is linked to the Rainfall Prediction algorithm housed in the Stormsaver Active Attenuation control panel. The water is then lowered to a safe level so when the rainfall event arrives the necessary attenuation capacity is available within the tank, while also allowing Rainwater Harvesting capacity to service the buildings water demand.

The system has a built-in fail safe so that the total attenuation capacity is available for all events that the system is designed for. Utilising mandatory flood protection infrastructure in this way the Stormsaver system provides all new commercial buildings with a source of valuable recycled rainwater without the need for additional, expensive infrastructure.

Active Attenuation is one of the best ways to manage stormwater.

Not only does Active Attenuation provide a non-potable water supply through recycled rainwater, but it can also reduce stormwater discharge rates by reusing rainwater stored in the attenuation capacity.

Think of the technology as a 2-in-1!

Why this is important…

• A water deficit of 5 billion litres every day by 2050, according to the Environment Agency.
• Many areas in the Southeast are considered seriously water stressed, hindering further development.
• UK Government targets to reduce non-household use of public water supplies by 9% by 2038.
• An ageing combined sewer network transports stormwater and foul water, causing untreated sewage to overflow into waterways during heavy storms.
• The natural drainage cycle is being increasingly disrupted by ongoing construction, preventing the natural infiltration of stormwater.

Active Attenuation produces a non-potable water supply. Non-potable water supplies can be used for…

• Toilet flushing
• Vehicle washing
• Manufacturing processes
• Irrigation
• Laundry
• Cooling
•  

Active Attenuation is suited for high water-using properties looking to improve water efficiency standards, including…

• Manufacturing sites
• Distribution centres
• Mixed-use developments
• Leisure facilities
• Supermarkets
• Hospitals
• Stadiums
• Offices

Maintenance – make it easy! The Active Attenuation System will be in operation for decades; therefore, it is important to ensure the arrangement specified is easy to maintain.

Cleaning of the attenuation crates – Stormsaver systems can be supplied with a maintenance control box for easy cleaning of the attenuation crates.

Collection surfaces – for the best water quality, only reuse rainwater from the roof area. This will mean separating the roof and hardstanding attenuation capacities and connecting them via a non-return valve.

Maintenance access – Stormsaver systems take advantage of a small rainwater storage tank which is attached to the attenuation capacity. Essentially, this tank acts as a pumping, filtration, and valve chamber. This arrangement ensures ease of cleaning and maintenance.