SUPERSEDED NEGOTIATED - OPW25 0042 - REFERENCE DOCUMENT (As Published)

        CONTENTS
        1.      Introduction                                                                                                                                                                                              1
                1.1         Site Characteristics                                                                                                                                                                          1
                1.2         Regional Flooding                                                                                                                                                                             2
                1.3         Project Data and Guidelines                                                                                                                                                                   2
                1.4         Performance Criteria                                                                                                                                                                          3

        2.      Overland Flow Assessment                                                                                                                                                                                  4
                2.1         Local Hydrology Model                                                                                                                                                                         4
                            2.1.1          Catchments                                                                                                                                                                     4
                            2.1.1          Modelling Parameters                                                                                                                                                           6
                            2.1.2          Summary of Peak Flows                                                                                                                                                          6
                2.2         Local Flood Model                                                                                                                                                                             6
                            2.2.1          Model Setup                                                                                                                                                                    6
                            2.2.1          Results                                                                                                                                                                      10
                            2.2.1          Sensitivity Results                                                                                                                                                          14
                2.3         Lawful Point of Discharge                                                                                                                                                                   16

        3.      Conclusion                                                                                                                                                                                              17
        4.      Qualifications                                                                                                                                                                                          18
        Appendix A: Site Layout                                                                                                                                                                                         19
        Appendix B: Engineering Design Plans                                                                                                                                                                            20
        Appendix C: Proposed Flood Maps                                                                                                                                                                                 21

        Tables
        Table 2.1: Existing and Developed Catchment Parameters ................................................................................................................................. 4
        Table 2.2: Key modelling parameters - Hydrology ............................................................................................................................................... 6
        Table 2.3: Peak Discharge .................................................................................................................................................................................... 6
        Table 2.4: Adopted manning’s ‘n’ roughness....................................................................................................................................................... 7
        Table 2.5: Summary of Finished Floor Levels and Flood Immunity.................................................................................................................... 11

        Figures
        Figure 1.1: Site Locality ........................................................................................................................................................................................ 1
        Figure 1.2: NSC Flood Hazard Mapping ............................................................................................................................................................... 2
        Figure 2.1: Catchment Plan .................................................................................................................................................................................. 5
        Figure 2.2: TUFLOW Setup ................................................................................................................................................................................... 8
        FIGURE 2.3: MANNING’S ‘N’ VALUE..................................................................................................................................................................... 9
        Figure 2.4: Excerpt of Flood Depth and DV Map - 1% (2100) AEP ..................................................................................................................... 10
        Figure 2.5: Freeboard Assessment..................................................................................................................................................................... 12
        Figure 2.6: Excerpt of Severe Storm depth map - 1% (2100) AEP Fully Blocked ................................................................................................ 13
        Figure 2.7: Sensitivity 1 – Increased Flow Path Roughness - 1% (2100) AEP Fully Blocked – Depth and Hazard............................................... 14
        Figure 2.8: Sensitivity 2 – Blocked RIP - 1% (2100) AEP Fully Blocked – Depth and Hazard .............................................................................. 15
        Figure 2.9: Sensitivity 3 – Partially Blocked RIP - 1% (2100) AEP Fully Blocked – Depth and Hazard................................................................. 16




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Version: 0, Version Date: 01/01/1900