2021-01-27 Special Meeting Agenda

SPECIAL MEETING AGENDA                                                                   27 JANUARY 2021


                        Natural Hazards and Natural Resources Overlay Code
            Assessment Benchmark                                            Assessment
                                                        In even the 50%AEP flood event, the majority of the
                                                        site is mapped as flood hazard category H3 or
                                                        greater – which corresponds to unsafe conditions for
                                                        children and the elderly.
                                                        There are higher areas of the site which are
                                                        proposed to be filled to be flood free in the 1% AEP
                                                        event. However, these higher areas are surrounded
                                                        by floodwaters (i.e. isolated) in only the 20% AEP
                                                        event and at risk of being inundated in extreme
                                                        events, so are not an appropriate location to shelter
                                                        in place.
                                                        An evacuation plan and emergency management
                                                        procedures have been submitted by the applicant,
                                                        however are completely reliant on visitors identifying
                                                        the hazard and taking logical and appropriate steps
                                                        to self-evacuate within a short space of time. The risk
                                                        is further compounded by the possibility of visitors
                                                        sheltering within higher areas of the site and
                                                        becoming isolated (cut-off) by rising flood waters.
                                                        Conditions are provided aimed at reducing these
                                                        risks by requiring an active warning system plus
                                                        eliminating areas of potential isolation.
                                                        In addition to the safety issues, there may be
                                                        significant whole-of-lifecycle costs associated with
                                                        the impact to park infrastructure from this frequency
                                                        of flood inundation that have not been quantified by
                                                        the applicant. The applicant has however stated they
                                                        are prepared to budget for these costs.
O19 Development is undertaken in a manner               Filling of the site to achieve an appropriate level of
that ensures—                                           flood immunity is not possible and has not been
                                                        proposed, due to the likelihood of causing
a) natural hydrological systems are protected;
                                                        unacceptable off-site flood impacts.
b) natural landforms and drainage lines are
                                                        As such, relatively minor earthworks only are
      maintained to protect the hydraulic
                                                        proposed. Cut/fill is generally limited to around 0.5m
      performance of waterways; and
                                                        except for a significant mound (fill >2.0m) for the
c) development integrates with the natural              facilities block.
      landform rather than modifying the landform
      to suit the development
O20 Development does not compromise the safety          Conditions within the site are unsafe for children in
of people resulting from residual flood risk            even the most frequently occurring events, so are
associated with events that exceed the defined          only higher hazard in rarer events. Again, safety in
flood event, up to and including the probable           these flood events relies entirely on evacuation.
maximum flood.                                          No actual mapping or assessment of the PMF event
                                                        has been provided in the Flood Assessment Report.
                                                        Conditions are provided aimed at reducing these
                                                        risks by requiring an active warning system plus
                                                        eliminating areas of potential isolation.
Flood impacts                                           Minor impacts are predicted external to the site –
O22 Development does not directly, indirectly or        mostly in the range of 10-50mm increases in peak
cumulatively alter the flood characteristics external   flood depths (though higher localised impacts on
to the development site for all flood events up to      road reserve were noted).
and including the defined flood event based on—         The most concern is in relation to increases in the
a) current climate conditions; and                      flood level of over-floor flooding at buildings adjacent
                                                        to the park. Complete elimination of impacts is not


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