The StormHarvester Active Attenuation system works by continually monitoring short- and medium-term rainfall forecasts. Once rainfall is forecast the system automatically adjusts the water levels within the tank to ensure that there is sufficient free volume to attenuate the stormwater runoff from the upcoming rainfall event. This means that one “Smart” tank can now be used for both Rainwater Harvesting and Storm Attenuation

Benefits of the StormHarvester Active Attenuation System.

50% reduction in cost of Rainwater Harvesting System
Less space taken up on-site
Less time spent installing large tanks
On-going reduction in water Charges

Failsafe Systems.

Battery back up in power failure scenario.

Both the valve and the site controller have built in rechargeable battery backup packs to allow the system to continue working in the event of power failure. The system can operate satisfactorily for several days without power. Once the power is reconnected the system will automatically recharge the batteries.

System identifies and automatically reacts in coms failure scenario.

The StormHarvester “controller” and “control centre” carry out system handshakes at 5-minute intervals ensuring that any loss in communications are quickly and automatically detected

Automatically detects valve blockages.

The system automatically identifies partial and complete valve blockages and automatically alerts the owner of the infrastructure.

Automated Warning System.

Emails and SMS messages are automatically sent to pre-programmed phones and email addresses in the event of any failure, blockage or flood warning scenarios.

Case Studies.

Queen’s University Belfast.

The StormHarvester active attenuation system was developed and tested over 5 years in association with Queens University in Belfast. The system holds a test certificate from the UKAS accredited Hydraulic laboratory at Queens University.

Weather Forecast Algorithm.

Forecast Options

5 Day Forecasts

3 Day Forecasts

1 Day Forecasts

Data Analysis

Every 5 minutes new forecast data analysed


Atmospheric Pressure Forecasts monitored


Factor of Safety applied when predicting runoff volumes

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The StormHarvester rainfall forecast and runoff prediction technology works by checking forecasted information and determining a “safe level” for water within the tank every 5 minutes.

For the majority of rainfall events (low intensity and short duration events) the system only lowers the water level in the tank by a small percentage. In practice, water levels in the tank are regularly already well lower than the small percentage reduction required given that water is constantly being pumping out of the harvesting tank for reuse on the associated site.

The more intense rainfall events (short intense rainfall events (cloudbursts) are predicted using a combination of atmospheric pressure and rainfall forecasts. Cloudburst events will only occur when certain atmospheric pressure conditions are present. The StormHarvester system therefore continually monitors forecasted atmospheric conditions and when conditions conducive to a cloud burst are predicted automatically drains all tanks in the area effected at greenfield rates in preparation for the storm event.


Did you know……?? Standard Attenuation tanks sit empty between 95-99% of the time


The StormHarvester system controls water levels within attenuation or harvesting tanks by linking a valve or attenuation pump directly to a highly accurate rainfall runoff prediction algorithm.

StormHarvester Controller.

Live operational data and system warnings are displayed on a portal. This provides a simple interactive interface to ensure operational staff are fully aware of current site conditions and any warnings/system automations taking place.

StormHarvester Control Centre.

The StormHarvester control centre receives site-specific rainfall predictions from various sources including the British Met office. The controller runs this data through an algorithm estimating the likely runoff volume for the upcoming rain events. The site controller then automatically takes action to ensure there is adequate volume available within the tank a accommodate the predicted runoff volume.

Automatically detects valve blockages.

The system automatically identifies partial and complete valve blockages and automatically alerts the owner of the infrastructure.

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