Swmp

Table of Contents
1.0        INTRODUCTION ................................................................................................................................... 3
2.0        EXISTING SITE DESCRIPTION ......................................................................................................... 4
3.0        PROPOSED DEVELOPMENT ............................................................................................................. 5
4.0        EXISTING DRAINAGE.......................................................................................................................... 5
   4.1         Existing Drainage and Infrastructure .................................................................................................... 5

   4.2         Lawful Point of Discharge ........................................................................................................................... 6

5.0        STORMWATER QUALITY .................................................................................................................. 7
   5.1         State Planning Policy and Water by Design Assessment ................................................................. 8

   5.2         Construction Phase ....................................................................................................................................... 8

       5.2.1       Silt and Sediment Erosion ...................................................................................................................................... 8

   5.3         Completed Development............................................................................................................................. 9

       5.3.1       Water Quality Objectives ........................................................................................................................................ 9

       5.3.2       Sources of Contaminants ..................................................................................................................................... 10

       5.3.3       Proposed Treatment Measures ......................................................................................................................... 11

       5.3.4       Pollutant Modelling ................................................................................................................................................ 11

6.0        STORMWATER QUANTITY ............................................................................................................ 14
   6.1         Drains Analysis ............................................................................................................................................ 14

       6.1.1       Existing Catchments .............................................................................................................................................. 15

       6.1.2       Proposed Site ............................................................................................................................................................ 16

       6.1.3       Peak Flow Comparison ......................................................................................................................................... 16

       6.1.4       Peak Flow Mitigation (OSD) ............................................................................................................................... 17

   6.2         Proposed Drainage .................................................................................................................................... 19

   6.3         Downstream Infrastructure Consideration ...................................................................................... 19

   6.4         Climate Change Analysis for 1% AEP Storm Event at Year 2100 .............................................. 21

7.0        FLOODING ........................................................................................................................................... 22
8.0        CONCULSION ...................................................................................................................................... 22
APPENDIX A – Detailed Site Survey ........................................................................................................ 23
APPENDIX B – Site Plan ............................................................................................................................... 27
APPENDIX C – Concept Stormwater Management Plan ................................................................... 28

SCG Consulting Engineers                                                   Page 1                                                                     SCG Ref: 33132(SWMP)