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pdf (120.21 KB)
pdf (1.49 MB)
Permavoid Technical Bulletin Issue 1 -...
pdf (7.13 MB)
Discharge limitations are normally achieved by the incorporation of pre-fabricated Orifice Plate Flow Control devices, fitted with removable filters to protect the orifices. These are sized to suit the permitted discharge rate and the size of the sub-catchment, using standard hydraulic theory.

pdf (120.21 KB)
pdf (1.49 MB)
pdf (7.13 MB)