Attachment 4 - Stormwater Management Plan by O2 · MCU13/0251

4.2.          Additional Treatment Considerations
Due to the site’s location (i.e. part of the Coastal Creeks Catchment and proximity with Lake Weyba),
additional infiltration of runoff to reduce the volume and frequency of runoff events occurring should be
taken into consideration.

As detailed in the Girraween Stormwater Management Plan (Ecological Engineering, 2006), where possible,
the frequency and volume of surface runoff discharged to the wet heath vegetation should be reduced by
maximising the infiltration of stormwater runoff to groundwater.

Bioretention is considered to represent the most effective stormwater treatment technology currently
available for nutrient removal and has the smallest land take per kg of nutrient removed of all current
treatment technologies. By constructing these systems with a “leaky” base, the opportunity to infiltrate
runoff into the underlying dune sands is increased (Ecological Engineering, 2006). Other options for “leaky
bases” and increased infiltration include stormwater pits and the proposed detention tank system detailed
in Section 6. Measures such as these are commonly used in Western Australia and can be further
investigated during the detailed design phase following discussions with SCRC officers.




STORMWATER MANAGEMENT PLAN – PEREGIAN VILLAGE MARKET                                                 Page 6

Scanlon Property Group
R002616