2008/0169 Response to information request - 71 Seaview Tce Sunshine Beach · 132008.169

1.0         INTRODUCTION ................................................................................................................................................................................................................... 1

2.0         SITE CHARACTERISTICS ........................................................................................................................................................................................................ 1

      2.1        LOCATION ...................................................................................................................................................................................................................... 1

      2.2        TOPOGRAPHY AND SITE DRAINAGE ............................................................................................................................................................................... 2

3.0         WATER QUANTITY - ADJOINING DEVELOPED SITE ............................................................................................................................................................. 3

      3.1        INTRODUCTION ............................................................................................................................................................................................................. 3

      3.2        CATCHMENTS ................................................................................................................................................................................................................ 3

      3.3        CO-EFFICIENT OF RUNOFF ............................................................................................................................................................................................. 4

      3.4        TIME OF CONCENTRATION ............................................................................................................................................................................................ 4

      3.5        RAINFALL INTENSITIES ................................................................................................................................................................................................... 4

      3.6        FLOWS (UNMITIGATED) ................................................................................................................................................................................................. 4

      3.7        MANAGEMENT OF FLOWS ............................................................................................................................................................................................. 5

4.0         WATER QUANTITY - PROPOSED DEVELOPMENT ................................................................................................................................................................ 9

      4.1        INTRODUCTION ............................................................................................................................................................................................................. 9

      4.2        CATCHMENTS ................................................................................................................................................................................................................ 9

      4.3        CO-EFFICIENT OF RUN OFF ............................................................................................................................................................................................ 9

      4.4        TIME OF CONCENTRATION .......................................................................................................................................................................................... 10

      4.5        RAINFALL INTENSTIES .................................................................................................................................................................................................. 10

      4.6        FLOWS (UNMITIGATED) ............................................................................................................................................................................................... 10

      4.7        DETENTION OF POST DEVELOPMENT FLOWS .............................................................................................................................................................. 11

      4.8        FLOWS MIGITATED ...................................................................................................................................................................................................... 12

      4.9        TREATMENT OF DRIVEWAY / CARPARK RUNOFF ......................................................................................................................................................... 13

5.0         CONCLUSION ..................................................................................................................................................................................................................... 14

APPENDIX A - SCRC INFORMATION REQUEST

APPENDIX B - RATIONAL METHOD CALCULATIONS

APPENDIX C - OPEN DRAIN / CHANNEL CALCULATIONS

APPENDIX D - XP SWMM RESULTS