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: Siphonic systems exit a building in the same manner as traditional systems, but at typically shallower invert levels (usually just deep enough for protection from weight loading). Common practice is to run the piping in its siphonic size and then increase the pipe diameter to the “equivalent” gravity pipe size to reduce the discharge velocity to 1.5m/s which is then connected to the soakwell or rainwater disposal system with a vented cover. This type of connection “breaks“ or terminates the siphonic condition. The receiving stormwater system sees no difference between siphonic and conventional downpipe systems in the amount of water received.

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

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