Attachment 3 - Additional Information Barlow Shelley

Council’s hydrology consultant simply undertook a peer review of Tony Shelly’s report and
confirmed that the flooding situation may actually be worse than identified by Tony Shelly’s
report. Council’s hydrology consultant provided the following comments in this regard:
     1. The flood report suggests that only 30% of the total catchment flow will drain through the
         site but there is no detail of how this has been determined. A review of the LiDAR ground
         level DEM of the area suggests most, if not all, of the total catchment runoff is likely to
         drain through the site.
     2. The modelling makes no allowance for fence blockages and appears to be too localised to
         provide meaningful results. While I have not inspected the site, aerial imagery shows that a
         tennis court is situated immediately downstream. Given the bushland catchment, there is a
         high potential for a chain wire fence to become highly blocked with debris and this will
         increase flood levels through the site.
     3. No comments have been provided in regards to the flood resilience of the dwelling. It is
         situated within a natural bushland flow path and it will be subject to flooding from time to
         time (certainly below floor level). It would need to be demonstrated that the house is
         resilient to flooding and given consideration to the high levels of natural debris that is likely
         to be mobilised during a large flood.
     4. Flood hazard risk associated with the proposed access should be assessed in more detail
         and account for full catchment flows and debris.
    • Confirmation of the sections of the planning scheme and policies that the proposal conflicts
         with.

The proposal is contrary to the Noosa Plan’s Noosa Heads Locality Code and Reconfiguring a Lot
Code as the proposed lots (lot 1) are not suitable for their intended use; do not contain house site
areas 100% above the 1%AEP flood level; will not maintain the safety of people and will not achieve
a high level of residential amenity given the overland drainage path that traverses the site. The
proposed reconfiguring a lot will ultimately place more people within an area which has a clear risk
of flooding compromising people’s safety. This would be particularly so where future residents are
unaware of the significance of the proposed drainage easement.


Thank you for your assistance.


Nadine Gorton
Senior Town Planner
martoo consulting pty ltd




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