How Siphonic Roof Drainage works
At Low Rainfall Siphonic Roof Drainage works similarly to traditional roof drainage.
When Design Rainfall occurs, the collecting pipe fills with water - next the water falls at high velocity through the downpipe and sucks the water from the roof. This movement is called Siphonic Action.
The full bore flow and the higher flow velocity in the siphonic pipework result in much smaller pipe diameters than used in a gravity flow system.
A second pipe system or special attic outlets with downpipe in the facade area are also common for emergency overflow.
What are the benefits of Siphonic Roof Drainage
In the life cycle of a building: from the the raw material extraction to the demolition and waste treatment. At every step material and energy are saved.
Siphonic Roof Drainage takes more time to fill the pipes with rainwater. This controlled delay may take a few minutes. Therefore, Siphonic Roof Drainage cuts the peak runoff into sewer systems and will mitigate urban flooding.