2018-05-14 GC Agenda Attachment 1 to Item 6 Lake MacDonald Dr Community Reference Group Investigations Report

Image 5-1: Shallow floodplain channels near Liane Drive



Option 2A - High level earth bund from Liane Drive
As per Option 1; however, with the earth bund raised to an elevation above the major flood level.
This would require the earth bund to be approximately 2m above the natural ground surface.

The flood model results demonstrated similar reductions in flood levels in the vicinity of Highland
Drive as seen for Option 1.

Localised upstream increases in flood levels exceed 1m immediately upstream of the higher bund.
Downstream along the main branch of Six Mile Creek flood levels increased by approximately 100
to 250mm for both moderate and major flood events. Refer to Figure 13 and Figure 14.




Lake McDonald Flooding Community Reference Group Report                                       Page 21