07/0198 - Op Works - Prescribed Tidal Work - Retaining Wall [As Published] · 142007.198

Queensland
Government
Enquirics Trevor Carter
Telephone 32276718 Environmental Protection Agency

Our reference BNE24889 Incorporating the

Queenstand Parks and Wildlife Service
30 October 2006

 

Chief Executive Officer
Noosa Shire Council
PO Box 141

Tewantin Qld 4565.
Attention: Peter Milne

 

Dear Sir
Stabilisation of Noosa Spit

_ [refer to your email of 25 August 2006 seeking comments on proposals to combat erosion of the
spit within the mouth of the Noosa River.

The Environmental Protection Agency acknowledges that the erosion occurring on the spit is a
significant problem which cannot be allowed to continue indefinitely. Clearly if the channel
broke through the spit separating the channel from Noosa Sound, the subsequent changes to the
tidal and flood flows could cause problems for Hayes Island. It is also acknowledged that Council
does not want any further significant recession of the spit and that it wishes to preserve the
existing sandy beach in the middle of the spit.

As you are aware, any significant flooding event would be likely to result in a more northerly
dominant channel, relieving the current erosion threat to the spit. Similarly, artificial relocation of
the present channel to a more northerly alignment would also relieve the present erosion threat.
However it is acknowledged that concems relating to the impact of dredging on the ecology of
the estuary make this option less desirable. Accordingly, the Agency is prepared to support your
consultant’s approach of providing some form of hard protection works along the spit to combat
the erosion problem.

The erosion problem occurring along the spit is considered to be more a river training issue rather
than a coastal erosion problem. The most common means of training a river is through the use of
river groynes. This method has the advantage of overcoming the erosion threat while also
preserving to some degree a natural bank.

FACWW Coastal 160 Ann Street Brisbane
Approvals\Documents\Letters\BNE 24889 stable Queensland 4000 Australia
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Queensland 4002 Australia ~

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