Appendix 2 - Code Assessment

                                                                designed and constructed to be consistent with the
                                                                current International Erosion Control Association Best
                                                                Practice Book Series.

  Stormwater quality and protection of receiving waters
  PO6                                                           AO6.1                                                         Compliant
  Development is located, designed, constructed and operated    Stormwater runoff discharging into High Ecological Value      Where required, any stormwater quality treatment will be
  to protect and enhance environmental values and water         waters as a result of development causes no increase in       in accordance with best practice principles.
  quality of waterways, wetlands, lakes, ground waters and      gross pollutants, total suspended solids, total phosphorous
  drainage systems.                                             or total nitrogen compared to a pre-development
                                                                scenario.

  Editor’s note: Environmental values of waters and water       AND
  quality objectives are prescribed in Schedule 1 of the
  Environmental Protection (Water) Policy 2009 and are          AO6.2
  identified on the State Planning Policy Interactive Mapping   All stormwater runoff is treated to achieve maximum
  System.                                                       removal of 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                                                         Compliant
  Water quality treatment systems use natural processes and     Water quality treatment systems are designed to be            Where required, any stormwater quality treatment will be
  materials, whenever possible, and are integrated into         integrated into the landscape consistent with the             in accordance with best practice principles.
  development to enhance biodiversity and landscape benefits.   technical design guideline published by Healthy Land and
                                                                Water Water by Design for the feature. (eg. For
                                                                Bioretention Basins: Bioretention Technical Design
                                                                Guidelines (October 2014) and for Wetland Systems
                                                                the Wetland Technical Design Guideline (May 2017).




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