The water is sucked or siphoned from the roof down into the drain at high velocity. Siphonic systems run at higher capacity and higher velocity that a gravity system because the water collected from individual roof outlets is literally sucked along the collector pipe suspended in the space about 1 metre below the roof membrane or gutter sole level. 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.
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