2015-03-31 I&S Committee - Item 4 - Attachment 1 - Flood Mitigation Investigation Ashgrove Dr Cooroy

Flood Mitigation Investigation: Ashgrove Drive, Cooroy


1 INTRODUCTION
Hydrology and Water Management Consulting Pty Ltd (HWMC) has been commissioned by Noosa
Council to undertake a hydraulic investigation to explore opportunities for flood mitigation at
Ashgrove Drive in Cooroy.

This project follows on from HWMC’s December 2013 review of flood mitigation opportunities for
Cooroy. The 2013 review identified that the upcoming upgrade to the Bruce Highway at Cooroy
presents an opportunity to mitigate Cooroy Creek flooding of the existing residential properties on
Ashgrove Drive.

HMWC have attended meetings with Noosa Council, the Department of Transport and Main Roads
(DTMR) and their civil engineers, GHD to discuss this opportunity and the mitigation options
analysed for this investigation have been selected in consultation with these organisations.

The flood models used for the design of the Bruce Highway Upgrade have provided by GHD for
use in this investigation. With these models, HWMC have been able to do a comparison of the
existing scenario flooding characteristics with the upgraded highway in conjunction with Ashgrove
Drive flood mitigation works.

The purpose of this investigation is as follows:

      Test a number of flood mitigation options for Ashgrove Drive and select a preferred
       mitigation option;
      Develop a preliminary concept design for the preferred mitigation option
      Carry out flood modelling to demonstrate the associated flood impacts and flood benefits
       across a range of magnitude flood events.
      Describe the key hydraulic requirements of the flood mitigation option and detail relevant
       hydraulic parameters to guide future detail design of these works, which HWMC understand
       will be carried out by DTMR’s civil engineers, GHD.




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