Customized Siphonic Roof Drainage Outlet

Short Description:

In principle, syphonic drainage is a very simple process. Unlike traditional roof drainage, which is designed to flow part full, a syphonic system operates at full capacity, when water is sucked or syphoned from the roof down into the drain at high velocity. The Fullflow system allows architects, consultants and contractors alike to specify a lower number of roof outlet drains and have them flow into a single downpipe. Whereas a conventional outlet is simply a hole set into the lowest point on the roof, into which the water pours, the syphonic drain incorporates an anti-vortex plate that acts as a baffle, allowing only water to be drawn of the roof. During heavy rainfall the outlet drain fills to above the anti-vortex plate, cutting off air flow into the pipe. This lack of air, coupled with the downward pull of the water creates a vacuum. The drainage pipes then flow at 100% full over the entire system. The priming of a Fullflow syphonic system takes place in four typical stages: Gravity Flow, Plug Flow, Bubble Flow and Full Bore.