Increased drainage capacity to prevent urban flooding

The Water Siphonic Regulator from Aiwell Water controls and improves water drainage, helping to prevent flooding and damage caused by polluted road runoff.

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Rising temperatures have led to a worldwide flooding crisis. Flooding in populated areas may lead to deaths, injuries and property loss, as well as power outages and waterborne diseases. Water from roads and sewage may seep and back up into buildings, making them uninhabitable. Contaminated runoff may pollute parks, waterways and surrounding areas.

Conventional drainage systems are proving inadequate for coping with the rise in urban flooding. Paved streets and roads increase the speed of flowing water, contributing to a surface runoff that may overwhelm drainage capacity. Although existing pipes may have an ample diameter, much of the flowing water is displaced by air – thus limiting both capacity and velocity.

Boosting the efficiency of piped drainage systems to prevent flooding

Aiwell Water has used its expertise with full-flow roof runoff to develop the Water Siphonic Regulator. When drainage pipes reach their overflow limits, a specialised, non-electric valve converts water flow from gravity-based to an airless siphonic drain. By utilising the full capacity of the pipes, the system is able to drain up to 40 per cent more water on flat terrain. As the slope increases, total capacity may increase up to 200 per cent or more.

The Water Siphonic Regulator is economical to install and runs without external power. The system can easily be installed in existing drainage infrastructure, without the need for digging up streets or laying new pipes. Existing pipes can be reused by simply adding a fibre-glass-reinforced liner cured by UV light. Monitors may be added to measure and ensure correct operation.

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Concrete benefits

In settled areas, the Water Siphonic Regulator provides added support for drainage around buildings. Even when water is flooding over the manholes, the pipes from the houses will continue to suck the water out. In an emergency, this would enable a road to be used as a safe floodway, without risking basement flooding and water damage. Moreover, the increased drainage capacity of the pipes allows for smaller pipes to be installed in sensitive drilling areas such as quick clay or building foundations. Smaller pipes reduce construction, maintenance and repair costs.

Further escalation in flooding is expected as a result of climate change and rapid urbanisation. The Water Siphonic Regulator can be an important component in new or existing drainage systems, helping to mitigate the high human, environmental and economic costs of flooding.

Market potential

According to the International Institute for Applied Systems Analysis (IIASA) the costs associated with flooding will increase in Europe from some USD 5.6 billion to roughly USD 29 billion by 2050.

A full-scale test facility for the Water Siphonic Regulator has been successfully installed in Holmestrand municipality, with plans for testing and installation in other Norwegian towns and cities.

Aiwell Water's technology is patented in the US and the EU. The company is currently seeking international investors or partners for further development of the technology.

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Borgeskogen 6, 3160 STOKKE, Norway

+47 33 01 81 80

At a glance

  • Road drainage pipe improvement system

  • Can be added to existing pipe infrastructure

  • Expands water flow capacity by 40% or more


Under development
Aiwell Water is currently seeking international investors or partners for further development of the technology.

Advancing the Sustainable Development Goals