Appendix F - Flood Study

                                                                                                      Flood Study
                                                                                            Noosa Care - Carramar



Table 4-1      Manning’s n Roughness Values

               Land Use                       Manning’s ‘n’


                 Roads                             0.02
               Golf course                         0.03
          Dense Vegetation                         0.12
               Easements                           0.06
                 Urban                             0.2
                Buildings                          0.5

4.1.5          Cross-sections
Cross-sections from the flood study undertaken in 2006 have been used in defining Wooroi Creek and the
tributary to the east of the study site. From a comparison of the LiDAR data against the cross sections,
modification of the 2D grid was undertaken to reflect the bottom level of the cross sections.

4.1.6          Dam
A dam is located on the tributary near the downstream boundary of the site. From the survey data, the main
dam embankment is graded from 8.2 mAHD to 8.0 mAHD, with the spillway level at 7.53 mAHD. The dam has
been modelled using these levels.

4.1.7          Road Levels
The LiDAR data obtained for the study agreed well with the levels used in the 2006 study.

4.1.8          Structures
Dimensions of key hydraulic structures have been obtained from the Noosa Council Interactive Mapping
website. These have been represented using 1D elements in the hydraulic model. The location of structures
is shown in Figure 4-1.




24 July 2017                                       Cardno                                                      9