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2015-03-31 I&S Committee - Item 4 - Attachment 1 - Flood Mitigation Investigation Ashgrove Dr Cooroy
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Flood Mitigation Investigation: Ashgrove Drive, Cooroy
Option 3 – Ashgrove Drive Culvert Upgrade with Inlet Works & Upstream Bunds
This option is similar to Option 2 expect that a property resumption is not required. Instead, flood
waters are directed to the existing drainage easement at Ashgrove Drive and upgraded culverts
convey flow through the estate. Flood waters are captured with a bund extending to the Bruce
Highway and an improved inlet channel would be constructed leading into the upgraded culverts.
This flood mitigation option was not selected as the preferred mitigation option because it caused
flood impacts over the existing residential properties downstream of Ashgrove Drive.
The basic line-work applied in the TUFLOW flood modelling is shown on Image 4-3 below along
with the mitigated case 1% AEP flooding characteristics.
Image 4-3 Option 3 Flood Model Line-work and Associated 1% AEP Flood Characteristics
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