E - Engineering Code Assessment.pdf

STORMWATER DRAINAGE DESIGN


 Performance Outcomes              Acceptable Outcomes                  Response


demonstrated this is              existing disturbed areas.
unavoidable, disturbed areas
are reinstated and revegetated    AO5.2
upon completion of works.         Stormwater drainage
                                  infrastructure is co-located with
                                  other infrastructure within a
                                  combined utility corridor where
                                  appropriate.

                                  AO5.3
                                  Temporary vehicular crossings
                                  of waterways must be designed
                                  and constructed to be consistent
                                  with the current International
                                  Erosion Control Association Best
                                  Practice Book Series.



STORMWATER QUALITY AND PROTECTION OF RECEIVING WATERS


 Performance Outcomes              Acceptable Outcomes                   Response


PO6                               AO6.1                                  Complies.
Development is located,           Stormwater runoff discharging into
designed, constructed and         High Ecological Value waters as a      The development is
operated to protect and           result of development causes no
                                                                         exempt from meeting
                                  increase in gross pollutants, total
enhance environmental values                                             stormwater quality
                                  suspended solids, total
and water quality of waterways,   phosphorous or total nitrogen          treatment objectives in
wetlands, lakes, ground waters    compared to a pre-development          accordance with Qld SPP
and drainage systems.             scenario.                              (2017). Alternative
                                  AND                                    stormwater quality
                                                                         treatment outcomes will be
                                  AO6.2                                  provided, such as sloping
                                  All stormwater runoff is treated to    impervious surfaces to
                                  achieve maximum removal of
                                                                         landscapes areas.
                                  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).