Amended Stormwater Plan · MCU18/0019

SC7440 – Goodchap St, Noosa                                                                                                                 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
3.0    Water Quality Management .................................................................................... 5
   3.1         Background ......................................................................................................... 5
   3.2         Construction Phase.............................................................................................. 5
   3.3         Operational Phase ............................................................................................... 6
       3.3.1      Water Quality Objectives.................................................................................. 7
       3.3.2      Catchment Areas ............................................................................................. 7
       3.3.3      Pollutant Export Modelling ............................................................................... 7
       3.3.3.1        Rainfall Data................................................................................................ 8
       3.3.3.2        Treatment Nodes ......................................................................................... 9
       3.3.4      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............................................................................................ 10
       4.3.1      Methodology .................................................................................................. 10
       4.3.2      Catchment Areas ........................................................................................... 11
       4.3.3      Roughness Coefficients ................................................................................. 11
       4.3.4      Storm Events ................................................................................................. 11
       4.3.5      Outlet Condition ............................................................................................. 12
       4.3.6      On-Site Detention .......................................................................................... 12
   4.4         Modelling Results .............................................................................................. 13
   4.5         Impacts on Existing Infrastructure ...................................................................... 14
5.0  Flood Hazard Overlay ........................................................................................... 18
6.0  Conclusions .......................................................................................................... 19
APPENDIX A – STORMWATER MANAGEMENT PLAN..................................................... 20
APPENDIX B – STORMWATER QUALITY MUSIC MODELLING ....................................... 21
APPENDIX C – XP-STORM MODELLING .......................................................................... 25
APPENDIX D – SPEL SPECIFICATIONS ........................................................................... 30
APPENDIX E – RATIONAL METHOD CALCULATIONS .................................................... 31