1909-13367 SRA referral response approved docs

                                      Figure 4 – 2D model grid extents

2D Head Boundary

A single 2D head boundary was placed downstream of the development site along the boundary of the
2D mesh with a tail water level set at 0.0mAHD in order to simulate free outfall condition.


Default 2D Landuse

The default landuse that has been adopted was named “Grass”. This landuse had the below
parameters.



          Mannings Roughness n = 0.045

          No rainfall infiltration.



DTM

The adopted DTM used LIDAR as previously mentioned for the entire study area. The 3D survey was
overlaid on top of the LIDAR within the civil design program 12D. The LIDAR within the boundaries of



                                                 Flood Study                                     16
S19-007                                   122 & 144 Myall St, Cooroy