21-0288-FS001-V4_GlenridgeDr_FS-reduced

      CONTENTS
      EXECUTIVE SUMMARY ............................................................................................................................ I

      1.     INTRODUCTION .............................................................................................................................. 1
             Site Location .................................................................................................................................. 1
             Response to Further Advice ........................................................................................................ 3
             Response to Information Request ............................................................................................... 4

      2.     AVAILABLE DATA ........................................................................................................................... 6

      3.     HYDROLOGY .................................................................................................................................. 7
             Catchment .................................................................................................................................... 7
             Rainfall Depths .............................................................................................................................. 8
             Peak Flow Rates and Verification ............................................................................................... 8
             3.3.1.             TUFLOW Peak Flows .................................................................................................. 8

      4.     HYDRAULICS ................................................................................................................................. 10
             Model Setup ................................................................................................................................ 10
             4.1.1.             Topography ............................................................................................................. 10
             4.1.2.             Inflow ........................................................................................................................ 10
             4.1.3.             Roughness ................................................................................................................ 10
             4.1.4.             Boundary .................................................................................................................. 10
             4.1.5.             Culverts..................................................................................................................... 10
             Model Scenarios ......................................................................................................................... 11
             4.2.1.             Existing Scenario (E02) ............................................................................................ 11
             3.2.3              Proposed Scenario (P03) ........................................................................................ 11
             Results ........................................................................................................................................... 12
             4.3.1.             Existing Scenario ...................................................................................................... 12
             4.3.2.             Proposed Scenario ................................................................................................. 12
             4.3.3.             Flood Hazard Overlay Code Response ................................................................ 16

      5.     CONCLUSION .............................................................................................................................. 17

      6.     REFERENCES ................................................................................................................................. 18


      LIST OF TABLES
      Table 2-1: Summary of Study Data ..................................................................................................... 6
      Table 3-1: Catchment Details .............................................................................................................. 7
      Table 3-2: Rainfall Depths ..................................................................................................................... 8
      Table 3-3: 1% AEP Peak Flow Verification .......................................................................................... 8
      Table 3-4: 1% AEP Peak Flow Comparison ......................................................................................... 9
      Table 4-1: Model Roughness Values ................................................................................................. 10
      Table 4-2: Model Culvert Information ............................................................................................... 11
      Table 4-3: Existing and Proposed Peak discharge at the Site Boundary. ..................................... 12




21-0288-FS001-V4 | Flood Investigation | 60 Glenridge Drive, Cooroibah                                                                                                | ii