Refernce Documents - RAL25 0001

                     The flood extent mapping shows that there are no significant changes to flooding extents
                     (pre vs post development) external to the site and that the lots are not impacted by 1%
                     AEP flows through the central channel. Some minor overland flow is observed through
                     the western portion of the site where the existing topography channelises flow as it leaves
                     the site’s western boundary.



                     5.4     Water Quality Management

                     The intended land use (rural residential plus significant areas of environmental covenant)
                     is considered low impact with respect to pollutant load generation when compared to
                     typical urban developments. The target pollutants for water quality management in new
                     developments are typically organics (phosphorous and nitrogen), suspended solids
                     (sediment) and gross pollutants (litter). A large percentage of these pollutants are
                     released to downstream waterways as a result of land disturbance associated with
                     earthworks and building operations. The proposed development works will include
                     erosion and sediment control measures during the construction phase and minimal
                     pollutant load generation during the operational phase.


                     New roads will be subject to local traffic only with a low volume of vehicle movements
                     expected. Runoff from these areas will be directed to vegetated buffers and swale drains
                     which will provide primary and tertiary water quality treatment prior to discharge at the
                     existing waterways. The high overall percentages of pervious surfaces within the site will
                     disconnect impervious areas and promote infiltration of stormwater runoff.


                     No further water quality management is proposed for the site. This approach is
                     considered generally in accordance with SPP Guidelines and has been approved for similar
                     development sites in the area.




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Document Set ID: 23448644
Version: 1, Version Date: 13/01/2025