Appendix F - Flood Study

                                                                      Flood Study
                                                            Noosa Care - Carramar




Table of Contents
1      Introduction                                                            1
       1.1        Summary                                                      1
       1.2        Site Description                                             1
       1.3        Scope of Work                                                2
2      Available Information                                                   3
       2.1        Digital Terrain Model                                        3
       2.2        Aerial Photography                                           4
       2.3        Previous Models                                              4
3      Hydrology                                                               5
       3.1        RORB                                                         5
                  3.1.1    RORB Parameters                                     6
                  3.1.2    RORB Validation                                     6
4      Hydraulic Model                                                         8
       4.1        Model Setup                                                  8
                  4.1.1   Grid Cell Size                                       8
                  4.1.2   Model Extent                                         8
                  4.1.3   Inflows                                              8
                  4.1.4   Roughness                                            8
                  4.1.5   Cross-sections                                       9
                  4.1.6   Dam                                                  9
                  4.1.7   Road Levels                                          9
                  4.1.8   Structures                                           9
5      Results                                                               11
       5.1        Comparison with Previous Modelling                          11
                  5.1.1     Peak Flows                                        11
                  5.1.2     Peak Water Levels                                 11
       5.2        Climate Change                                              11
       5.3        Culvert Blockage                                            13
       5.4        Regional Flood Levels                                       13
       5.5        Minimum Floor Levels                                        14
       5.6        Local Road Immunity                                         15
       5.7        Proposed Development                                        15
6      Conclusion                                                            16


Tables
Table 3-1      Rational Method Parameters                                      6
Table 3-2      Hydrology Validation                                            7
Table 4-1      Manning’s n Roughness Values                                    9
Table 5-1      Flow Comparison                                                11
Table 5-2      Flood Level Comparison                                         11
Table 5-3      Climate Change Peak Water Levels                               12
Table 5-4      Local and Regional Flood Model Results                         14
Table 5-5      Minimum Floor Levels Required                                  15

24 July 2017                                       Cardno                      iii