Stormwater Management Plan

SC5594 – Walter Hay Dr, Noosaville                                                                                                         2




                                                TABLE OF CONTENTS

1.0      Introduction ............................................................................................................. 3
   1.1        Background ......................................................................................................... 3
   1.2        Scope .................................................................................................................. 3
   1.3        Existing Topography ............................................................................................ 3
   1.4        Proposed Development........................................................................................ 4
2.0      Water Cycle Management ....................................................................................... 5
   2.1        Background ......................................................................................................... 5
   2.2        Wastewater Minimisation ..................................................................................... 5
   2.3        Stormwater Harvesting Tanks .............................................................................. 5
3.0      Water Quality Management .................................................................................... 6
   3.1        Background ......................................................................................................... 6
   3.2        Construction Phase.............................................................................................. 6
   3.3        Operational Phase ............................................................................................... 7
      3.3.1      Water Quality Objectives.................................................................................. 7
      3.3.2      Pollutant Export Modelling ............................................................................... 7
      3.3.2.1        Rainfall Data................................................................................................ 8
      3.3.2.2        Treatment Nodes ......................................................................................... 9
      3.3.3      Effectiveness in Pollution Reduction................................................................. 9
4.0      Stormwater Quantity Management....................................................................... 10
   4.1        Background ....................................................................................................... 10
   4.2        Site Drainage Constraints and Opportunities ...................................................... 10
      4.2.1      Drainage Constraints ..................................................................................... 10
      4.2.2      Drainage Opportunities .................................................................................. 10
   4.3        Modelling Overview............................................................................................ 11
      4.3.1      Methodology .................................................................................................. 11
      4.3.2      Catchment Areas ........................................................................................... 11
      4.3.3      Roughness Coefficients ................................................................................. 12
      4.3.4      Storm Events ................................................................................................. 12
      4.3.5      Backwater Condition ...................................................................................... 12
      4.3.6      On-Site Detention .......................................................................................... 12
   4.4        Modelling Results.............................................................................................. 13
5.0      Conclusions .......................................................................................................... 14
APPENDIX A – STORMWATER MANAGEMENT PLAN..................................................... 15
APPENDIX B – STORMWATER QUALITY MUSIC MODELLING ....................................... 16
APPENDIX C – XP-STORM MODELLING .......................................................................... 19