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Rainwater captured from the roof area is transported to a central location via separate pipework.

Roof runoff and surface water runoff are transported in separate pipework to avoid cross-contamination from the more heavily polluted surface water.

The rainwater is transported to a central storage location. All rainwater will go through a pre-tank filter to remove large debris prior to entering the tank.

Active Attenuation turns the rainwater harvesting storage and attenuation capacity into one capacity.

This is achieved by intelligent monitoring of incoming weather patterns. If the control panel detects a large storm is incoming and more capacity is required, it will reduce the level of stored water to an optimal level.

This is achieved via a fail-safe valve arrangement or booster set, depending on the site requirements.

When a demand for non-potable water is detected in the building, submersible pumps will boost the rainwater from the central storage tank to multiple smaller break tanks around the development.  

Environmental benefits

  • Reduce water consumption in new homes.
  • Reduce flood risk within the wider community.
  • Prevent surplus stormwater from entering the combined sewer system.
  • Lower the risk of untreated sewage overflowing into natural water courses.
  • Future-proof homes against the impacts of climate change.

Many housing developments require sustainable drainage systems (SuDs) to be installed as part of planning conditions. Typically, this involves installing large swales and ponds to achieve attenuation capacity. These ponds and swales take up valuable space in the development.

Active Attenuation can reduce pond sizes, ensuring compliance with biodiversity net gain restrictions, while supplying sustainable water to homes and creating more usable space for developers.

Active Attenuation produces a supply of recycled rainwater. Reclaimed rainwater can provide a sustainable water supply for many common uses of water within domestic properties, including…

  • Toilet flushing.
  • Garden irrigation.
  • Laundry.

Ideal project types:

  • Housing developments.
  • Student accommodation.
  • Residential apartments.
  • Hotels.
Communal System Types

Active Attenuation can be achieved in a variety of different ways. The type of system used will be dependent on the type, scale, and location of the residential development. Our team of experts is on hand to provide you with the most efficient system to maximise water savings and minimise stormwater discharge rates. Discover our solutions below.

 A diagram of a communal rainwater harvesting and attenuation system. Rainwater being collected in a central storage tank and boosted to each house.

Below Ground

  • Compatible with below-ground tanks or crates.
  • Suited for medium to large housing developments.
  • Central storage capacity feeds smaller break tanks across the site.
  • Separating roof and surface water provides a high-quality supply. 
  • Supplies non-potable water for dual pipe systems.
  • Connects roof and surface water capacities via a non-return valve.
  • Controls, pumps, and filtration in an above-ground weatherproof room.
  • Compatible with biodiversity net gain systems.

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 A rainwater harvesting diagram showing rainwater being recycled in an apartment block.

Above Ground

  • Suited to apartment blocks, student accommodation, and hotels.
  • Sectional storage tank located in a plant room for rainwater storage and attenuation.
  • Compatible with integrated concrete tanks providing there is sufficient space for a pre-tank filter and maintenance access.
  • The active Attenuation control panel can control a booster set where drainage is located at a higher level than the storage tank.
  • Can provide a non-potable water supply for dual pipe systems.
  • Compatible with blue roof systems.

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Technical Features

IOT Monitoring: Ease of monitoring of stored water levels and system health through a real-time customer portal.

Smart Weather Prediction: Autonomous monitoring of weather patterns 72 hours ahead, ensuring 100% of capacity is always available.

Safe-to-fail Operation: Includes battery backup and will default to a standard attenuation system in a failure scenario.

PLC Controls: Smart system with easy-to-replace components, minimising downtime compared to more common PCB controllers.

BMS Connectivity: Custom-designed to easily monitor storage levels, water consumption, faults, salinity levels, and temperature.

Mains Water Backup: Always prioritises rainwater but will automatically switch to mains water when necessary for a steady supply.

Mains Water Protection: Prevents mains water wastage with automatic shutoff valves and alerts, avoiding high water bills in valve failure scenarios.

Why Choose Stormsaver?

Our Added Value Options

Looking for additional filtration, UV disinfection, or installation services? Our added value options give you access to best-practice approaches. Learn more here. 

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Constructionline Gold Member CHAS Accredited UK Rainwater Harvesting Association Member Safecontractor Approved Waterwise Affiliate UK Business Awards Winner 2022