An anti-backflow junction device, system and method for fluid drainage systems is disclosed to increase velocity of one fluid flow with the introduction of that fluid flow to another fluid flow of the same fluid such as water, while allowing for the escape of a second fluid such as air having either a positive press...

A branch pipe arrangement for branching from a vertical pipe, the branch pipe arrangement comprising: a branch junction mounted to said vertical pipe having a restricted cross section on a vertical portion forming a nozzle, said nozzle arranged to increase a velocity head of water passing through said nozzle, an exp...

An flow concentration assembly for coupling to a downpipe the assembly comprising; a flow concentration pipe having an upstream diameter equal to the downpipe and an exit section having a diameter less than the upstream diameter; the flow concentration pipe positioned in the downpipe such that an exit aperture of t...