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.
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