Q: What are the differences between conventional and siphonic drainage systems?
Q: How does the cost of installation of a siphonic system compare to an equivalent “traditional” storm water system?
Q: What are the main benefits? Why use it?
Q: What special considerations are needed in the layout of roof drainage when using a siphonic roof drainage system?
Q: Where do siphonic systems terminate? How is the connection to the soakwell system made?
Q: Can the horizontal piping run uphill or can it offset up and over an obstruction?
Q: Is there any special maintenance required for siphonic drainage systems?
Q: Are secondary (overflow) systems necessary?
Q: What are the typical down pipe sizes?
Q: Is the design of the box gutter incorporating siphonic drainage different to that of a conventional downpipe system?
Q: How much room is required for the siphonic drainage system underneath the (box) gutter?

Q: Is there a minimum roof area required for siphonic drainage?

Q: How far can a siphonic drainage system run horizontally?
Q: Does siphonicroof drainage improve the green star rating of my building?



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 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.

Contact Us with any enquires at info@siphonic.com.au

Office Locations || Perth || Melbourne