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: To answer this question letís look at conventional drainage first: Most downpipe systems have a very inefficient method of discharging water from roofs, as water spirals down around the inner walls of the pipe with an air column in the centre. During drainage, the water in a conventional downpipe never exceeds a third of the pipe capacity, due to this air presence and its effects.
Siphonic drainage works very differently. Special siphonic roof outlets prevent air entering the pipes with only a small amount of water covering the outlet. The downpipe backs up (primes) and the gravity force pulls the water through the downpipes at high velocity. This high velocity creates friction loss within the pipe, which results in a negative pressure situation or vacuum, hence the rainwater gets sucked into the downpipe.

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