Amended Stormwater Managment 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      Catchment Areas ............................................................................................. 8
      3.3.3      Pollutant Export Modelling ............................................................................... 8
      3.3.3.1        Rainfall Data................................................................................................ 9
      3.3.3.2        Treatment Nodes ....................................................................................... 10
      3.3.4      Effectiveness in Pollution Reduction............................................................... 10
4.0      Stormwater Quantity Management....................................................................... 11
   4.1        Background ....................................................................................................... 11
   4.2        Site Drainage Constraints and Opportunities ...................................................... 11
      4.2.1      Drainage Constraints ..................................................................................... 11
      4.2.2      Drainage Opportunities .................................................................................. 11
   4.3        Modelling Overview............................................................................................ 12
      4.3.1      Methodology .................................................................................................. 12
      4.3.2      Catchment Areas ........................................................................................... 12
      4.3.3      Roughness Coefficients ................................................................................. 13
      4.3.4      Storm Events ................................................................................................. 13
      4.3.5      Backwater Condition ...................................................................................... 13
      4.3.6      On-Site Detention .......................................................................................... 14
   4.4        Modelling Results.............................................................................................. 16
5.0      Conclusions .......................................................................................................... 17
APPENDIX A – STORMWATER MANAGEMENT PLAN..................................................... 18
APPENDIX B – STORMWATER QUALITY MUSIC MODELLING ....................................... 19
APPENDIX C – XP-STORM MODELLING .......................................................................... 23