updated flood investigation

      CONTENTS
      1.    INTRODUCTION .............................................................................................................................. 1
            Site Location .................................................................................................................................. 1

      2.    AVAILABLE DATA ........................................................................................................................... 3

      3.    HYDROLOGY .................................................................................................................................. 4
            Catchment .................................................................................................................................... 4
            Peak Flow Rates and Verification ............................................................................................... 5
            3.2.1.            TUFLOW Peak Flows .................................................................................................. 5

      4.    HYDRAULICS ................................................................................................................................... 7
            Model Setup .................................................................................................................................. 7
            4.1.1.            Topography ............................................................................................................... 7
            4.1.2.            Inflow .......................................................................................................................... 7
            4.1.3.            Roughness .................................................................................................................. 7
            4.1.4.            Boundary .................................................................................................................... 7
            4.1.5.            Culverts....................................................................................................................... 7
            Model Scenarios ........................................................................................................................... 8
            4.2.1.            Existing Scenario (E01) .............................................................................................. 8
            3.2.3             Proposed Scenario (P01) .......................................................................................... 8
            Results - Existing Scenario (E01) ................................................................................................... 9
            4.3.1.            Existing Scenario ........................................................................................................ 9
            4.3.2.            Proposed Scenario ................................................................................................... 9
            4.3.3.            Severe Storm Assessment ....................................................................................... 12

      5.    CONCLUSION .............................................................................................................................. 13

      6.    REFERENCES ................................................................................................................................. 14


      LIST OF TABLES
      Table 2-1: Summary of Study Data ..................................................................................................... 3
      Table 3-1: Catchment Details .............................................................................................................. 4
      Table 3-2: 1% AEP Peak Flow Verification .......................................................................................... 5
      Table 3-3: 1% AEP Peak Flow Comparison ......................................................................................... 5
      Table 4-1: Model Roughness Values ................................................................................................... 7
      Table 4-2: Model Culvert Information ................................................................................................. 8
      Table 4-3: Existing and Proposed Peak discharge at the Site Boundary. ....................................... 9
      Table 4-4: 1% (2100) AEP Flood Storage Comparison. ................................................................... 10
      Table 4-5: Lot Levels Compared to Adjacent 1% (2100) AEP Peak Flood Levels ........................ 11




21-0288-FS001-V1 | Flood Investigation | 60 Glenridge Drive, Cooroibah