planning report hayward · OPW26/0149

4.2 Biodiversity Overlay & Works Codes

The application includes a dam in the bottom eastern corner of the site, which is ~150m from the
banks of Lake Macdonald. The location of the dam does not require any removal of vegetation and
is within an existing unformed drainage line. The design allows for the relandscaping of the dam
banks and overflow stream using tube stock vegetation consisting of lomandra and other larger tree
species before leaving the site under a culvert with Hayward Rd towards Lake Macdonald.
Appropriate landscaping conditions are sought in this regard for rehabilitation of existing grass areas.


The construction of the dam on the site is usually accepted development against the Earthworks &
Water Quality and Drainage Codes. The proposed dam includes a cut and fill balance that follows
the natural landforms, with a maximum 2m cut on a slope of 10% and setback more than 50m from
downstream neighbours. The dam has been designed by SCG consulting engineers, and the works
are to be supervised and certified in accordance with PSP6.


Stormwater flows will be consistent with predevelopment characteristics and wastewater is to be
appropriately treated in front of the STA units. An associated 240m2 effluent disposal plan is included
for combined treatment into the clay soils, with appropriate setbacks from neighbours and
waterways.




                  Figure 7: Proposed Effluent Disposal and land application area




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