5179Flood Report_REVISION_2_7Feb2021

                                                                                                                         Callaghan & Toth




CONTENTS
1.0  INTRODUCTION .................................................................................................................... 4
2.0  FLOOD IMMUNITY ................................................................................................................. 5
3.0 STORMWATER DETENTION REQUIREMENT ............................................................ 6
3.1 Broad-Brush Estimate Of Required Detention Volume ....................................................... 6
3.2 Hydrologic Model Set Up .................................................................................................... 6
3.3 Model Determination Of The Required Detention Volume ................................................. 9
3.4 Provision of Required Detention Volume ............................................................................ 9
4.0  SUMMARY ........................................................................................................................... 11
APPENDIX 1   - Reconfiguration of a Lot Layout plans .................................................................... A
APPENDIX 2   - FLOOD CALCULATIONS ..................................................................................... D



LIST OF FIGURES

Figure 1.1                      Site Location Plan…………………………………………………………….........4
Figure 3.1                      URBS Model of the Pre-Development Catchment Condition……….………….7
Figure 3.2                      URBS Model Of the Post-Development Catchment Condition……….……......8
Figure 3.3                      Proposed Stormwater Detention Facilities………………………………..…......10




LIST OF TABLES

Table 1              Predicted Peak Outflow Rates……………………..……………. …………………………8
Table 2              Required Detention Volumes …………………….……………. …………………………..9




                                                                                                                                    3
2035 2 Pearsons Road – Flood Study – Revision 2                                                              Feburary 2021