RFI - ATTACHMENT A - SBSMP - Rev 2

                                                                                             20169 - SBSMP/2
                                                                                                          Page 2




                                           Table of Contents
1     INTRODUCTION ............................................................................................ 3
2     EXISTING SITE CONDITIONS .............................................................................. 4
  2.1    The Site ................................................................................................ 4
  2.2    Surrounding Area ...................................................................................... 4
3     PROPOSED DEVELOPMENT ............................................................................... 5
4     EXISTING DRAINAGE PATTERNS ......................................................................... 6
  4.1    Existing Infrastructure ............................................................................... 6
  4.2    Existing Drainage Patterns ........................................................................... 7
  4.3    Lawful Point of Discharge............................................................................ 7
5     STORMWATER QUANTITY................................................................................. 8
  5.1    Rational Method Assessment ........................................................................ 8
    5.1.1     Design Storms ....................................................................................8
    5.1.2     Rainfall Intensity ................................................................................8
    5.1.3     Times of Concentration .........................................................................8
    5.1.4     Runoff Coefficients ..............................................................................8
    5.1.5     Peak Flows ........................................................................................9
  5.2    Proposed Drainage Patterns ......................................................................... 9
  5.3    Downstream Pipe Infrastructure Considerations ............................................... 10
  5.4    XPSTORM Modelling ................................................................................. 10
    5.4.1     Intensity Frequency Distribution ............................................................ 10
    5.4.2     Initial and Continuing Losses ................................................................. 10
    5.4.3     On-site Detention .............................................................................. 10
    5.4.4     Comparison of Peak Flows at Lawful Point of Discharge ................................. 11
6     STORMWATER QUALITY ................................................................................ 12
  6.1    State Planning Policy Assessment ................................................................ 12
  6.2    Construction Phase ................................................................................. 12
  6.3    Operational Phase .................................................................................. 14
    6.3.1     Sources of Contaminants ..................................................................... 14
    6.3.2     Proposed Treatment Train ................................................................... 15
    6.3.3     Pollutant Export Modelling ................................................................... 15
    6.3.4     MUSIC Modelling Parameters ................................................................. 15
    6.3.5     MUSIC Modeling Results ....................................................................... 16
7     FLOODING ................................................................................................ 18
8     CONCLUSION ............................................................................................. 19
Appendix A DETAILED SITE SURVEY PLAN ................................................................. 20
Appendix B PROPOSED DEVELOPMENT PLANS ............................................................ 21
Appendix C NOOSA COUNCIL INTERACTIVE MAPPING DATA ............................................ 22
Appendix D NSC WATER QUALITY AND DRAINAGE CODE ................................................ 23
Appendix E STORMWATER QUANTITY CALCULATIONS................................................... 24
Appendix F CONCEPT SITE LEVELS AND DRAINAGE PLAN ............................................... 25
Appendix G BOM IFD DATA .................................................................................. 26
Appendix H XPSTORM PRE DEVELOPMENT RESULTS ..................................................... 27
Appendix I XPSTORM POST DEVELOPMENT RESULTS .................................................... 28
Appendix J XPSTORM POST DEVELOPMENT MITIGATED RESULTS ...................................... 29
Appendix K STORMWATER QUALITY AND MAINTENANCE GUIDELINES ................................. 30
Appendix L NSC FLOOD HAZARD OVERLAY MAP .......................................................... 31




Site Based Stormwater Management Plan
Proposed Townhouse Development at 101-105 Eumundi Noosa Road, Noosaville