Drainage Assembly And Method

Abstract: 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 the exit section is concentric with the downpipe and directed downwards and; an flow concentration section in the downpipe providing a fluid path between a point adjacent to the exit aperture and a point external to the downpipe; wherein in use water is arranged to flow through the exit aperture so as to create an annular space about the water flow such that air in the annular space is releasable along the fluid path.

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