Referenced Documents - MCU11/0254

SWMP-Lot 4 Hofmann Drive, Noosaville                                                         7



3.3     Operational Phase
During the operational stage of the development, the following impacts have been identified in relation
to stormwater runoff and water quality of the receiving waterways:


        Gross pollutants which include human derived litter, course sediment and vegetation
        Sediment and suspended solids
        Nutrients such as phosphorous and nitrogen


To target these potential pollutants Best Management Practices have been adopted, to be incorporated
within the design to reduce pollutants and to preserve the environmental values and quality of the
receiving waters downstream of the development site. Run-off from pavement areas shall be captured
by baffled gross pollutant collection traps (‘Fox’ Environmental Systems BPT600 of Ecosol RES100)
for the removal of silt, sediment, gross solids and hydrocarbons. Maintenance of the units can be
carried out by the body corporate in accordance with the manufacturer’s specifications.


3.3.1   Deemed To Comply Requirements
Under the Water By Design Deemed To Comply Solutions for South-East Queensland, the proposed
development is classified as an R5 type development. Rainwater harvesting and re-use is proposed
facilitating the removal of suspended solids and the uptake of nitrates and phosphates by watering
landscaped areas. In addition, overflow from the tanks and captured run-off from impervious areas
within the development will be directed to a bio-filtration device sized at 1.7% of the total catchment
area. In this instance, this equates to a bio-filtration device sized at a minimum of 105m2 filtration area.
An extended detention of 300mm is to be incorporated within the device and a high flow outlet
incorporated to act as a by-pass for larger storm events.


Concept layouts and details are provided in Appendix A of this report.