Permavoid Rainwater Diffuser Unit

Run-off from building roofs would be collected into downpipes and flow into a back inlet gully incorporating an internal filter or catchpit inspection chambers. The back inlet gully or chamber discharges the filtered stormwater into the permeable sub-base via Heavy Duty Permavoid diffuser units encapsulated in a 2mm mesh fabric. The run-off will then diffuse out of the Heavy Duty Permavoid diffusers and into the modified granular sub-base layer. The Permavoid unit is a 150mm deep modular interlocking plastic unit storage system designed for use as a combined drainage component and sub-base replacement system that is ideal for the shallow infiltration/attenuation.

 

Typical layout - Rainwater downpipe drainage into sub-base reservoir

 

 






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Permavoid Rainwater Diffuser Unit Datasheet


pdf (349.85 KB)

Permavoid Technical Bulletin Issue 1 - Shallower Installations


pdf (1.49 MB)

Permavoid System Technical Manual


pdf (7.13 MB)