OPW052025 Report - Part 2

Stormwater quality and protection of receiving waters                       Table 9.4.8.3 Criteria for assessment (part)
Performance Outcomes                                              Acceptable Outcomes                                                                              Response
Stormwater quality and protection of receiving waters
PO6                                                               AO6.1                                                                   The proposed driveway follows an existing track located
Development is located, designed, constructed and operated to     Stormwater runoff discharging into High Ecological Value waters         through the allotment and all existing stormwater flow
protect and enhance environmental values and water quality of     as a result of development causes no increase in gross pollutants,      regimes will remain in place.
waterways, wetlands, lakes, ground waters and drainage            total suspended solids, total phosphorous or total nitrogen             Performance Outcome PO6 and Acceptable Outcomes
systems.                                                          compared to a pre-development scenario.                                 AO6.1, AO6.2 and AO6.3 can be met.

                                                                  AND
Editor’s note: Environmental values of waters and water quality
objectives are prescribed in Schedule 1 of the Environmental      AO6.2
Protection (Water) Policy 2009 and are identified on the State    All stormwater runoff is treated to achieve maximum removal of
Planning Policy Interactive Mapping System.                       nutrients, gross pollutants and suspended solids as determined
                                                                  by cost to efficiency ratios. (e.g. bioretention basins must be sized
                                                                  to achieve at least 80% reduction in total suspended solids, 60%
                                                                  reduction in total phosphorous, 45% reduction in total nitrogen
                                                                  and 90% reduction in gross pollutants >5mm).

                                                                  OR

                                                                  AO6.3
                                                                  Developments achieve a minimum 3 drop rating consistent with
                                                                  the Water by Design Living Waterways Scoring Guide (Healthy
                                                                  Land and Water).

                                                                  Editor’s note— PSP6 Engineering Design Standards - Roads,
                                                                  Drainage and Earthworks provides guidance on stormwater
                                                                  design and modelling requirements.
PO7                                                               AO7.1
Water quality treatment systems use natural processes and         Water quality treatment systems are designed to be integrated           The proposed driveway follows an existing track located
materials, whenever possible, and are integrated into             into the landscape consistent with the technical design guideline       through the allotment and all existing stormwater flow
development to enhance biodiversity and landscape benefits.       published by Healthy Land and Water Water by Design for the             regimes will remain in place.
                                                                  feature. (eg. For Bioretention Basins: Bioretention Technical           Performance Outcome PO7 and Acceptable Outcomes
                                                                  Design Guidelines (October 2014) and for Wetland Systems the            AO7.1 can be met.
                                                                  Wetland Technical Design Guideline (May 2017).