Siphonic Roof Drainage Association

Unlike traditional roof drainage systems a siphonic system is designed to operate with the piping completely charged with water during a rainstorm.

Siphonic roof drainage association.

Siphonic roof drainage association how it works. Drainage of large roof surfaces requiring a minimum outflow capacity of 1 0 l s. Adequate difference in height of at least four metres between the roof and the buried drains. The water is sucked or siphoned from the roof down into the drain at high velocity.

Materials the majority of siphonic drainage systems in the uk use high density polyethylene hdpe pipework. The srda promotes a wider understanding of the principles of siphonic drainage encourages best practice by suppliers and installers and provides a recognised platform for specifiers. The srda promotes a wider understanding of the principles of siphonic drainage encourages best practice by suppliers and installers and provides a recognised platform for specifiers. Hdpe can be connected using either electrofusion couplings which are heated by internal elements or by butt jointing where the cut ends of the pipe are melted and then forced together under pressure to make a joint.

By contrast a fully engineered siphonic roof drainage system contains an anti vortex plate that acts as a baffle and prevents air and debris from entering the piping system at full flow allowing the pipes to completely fill up with water. Developed by two engineers in finland siphonic roof drainage made its first appearance in europe in 1968.