A: Yes, the siphonic roof outlet requires a minimum design flow of 1 l/s in order to work with the siphoning effect. In the Perth metropolitan area this is equivalent to a 20m2 roof. Downpipes for this size of roof can be as small as Ø 40mm. Therefore, balconies and small canopies are not recommended to be drained by a siphonic drainage system but roof areas above 20m2 are well suited. There is no limit to the maximum roof area, which can be drained by siphonic drainage systems.
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