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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