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. The resulting higher operating velocities 3 ft sec up to 30 ft sec of a siphonic system further reduce pipe size and promotes self cleaning of debris. Siphonic roof drainage systems make full use of a building s roof height to drive the drainage capacity.
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