2015-11-10 Planning & Organisation Committee Agenda

PLANNING & ORGANISATION COMMITTEE MEETING AGENDA                          10 NOVEMBER 2015




        Figure 7 Biodiversity Overlay, with constructed bunds and dam indicated in red.
Bunds
After the Cyclone Yasi flooding event, the applicant formed three bunds to reduce flooding
impacts. Initial flood modelling by the applicant indicated that three bunds will cause
unacceptable flooding impacts on adjoining properties. As a result, the applicant intends to
remove two of the bunds (bund 1 & 2 above).
Revised modelling (with the removal of bunds 1 & 2), shows the impacts are concentrated on the
adjoining Unitywater property and represent a 10cm increase in flood waters during a 1% AEP
event. Notably, there is no development on the Unitywater site and flooding already occurs
during major flood events. As the topography rises steeply from the existing waterway in this
area, the increases are considered to have a negligible impact in terms of the flood extent and
are considered acceptable.
Council’s flooding consultant agrees with the modelling results and the retention of bund 3 will
not cause unacceptable flooding impacts on the neighbouring properties.
The remaining bund 3 is located to the south of the greenhouse, adjacent to the waterway. This
area is on the edge of the mapped Environmental Protection Area and within the root zones of
existing trees warranting protection. To reduce the impacts on the vegetation, the applicant
proposes to move the bunds 5-10m and revegetate between the waterway and the bund.
Council’s Environment Officer agrees with this approach and recommends conditions for
earthworks and revegetation to be undertaken in accordance with a subsequent Operational
Works approval.




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