Attachment I - Flood Assessment

Cooroy Hinterland Park Flood Assessment


4.2       Proposed Case
The proposed hinterland park has been incorporated into the TUFLOW model based on design
surface contour information by Form Landscape Architects. Various updates have been made to
the design surface as part of this investigation and these are outlined below.

      •    In some areas the design contours were found to extend into areas that will not
           realistically be modified for the project (for example the vegetated banks of Cooroy
           creek). These areas have been excluded from the design surface modelled and left as
           per the existing state.
      •    The design surface was found to have high ground proposed along the northern side of
           Maple Street and south of the proposed open space area. It was necessary to exclude
           this high ground from the proposed case modelling because adverse flood impacts were
           predicted. These areas have been left as per existing ground levels.
      •    Some minor lowering of surface levels along the northern boundary of the site have been
           incorporated for flood level impact reduction.
      •    The design contour elevations have been globally reduced by 100mm to mitigate peak
           flood level impacts.

Details of the updates to the proposed case design surface are shown on Image 4-1.




Image 4-1       Updates to the Proposed Design Surface Model




J00318R1V1                                                                                      7