Attachment I - Flood Assessment

Cooroy Hinterland Park Flood Assessment


Peak flood depth and velocity mapping for the proposed case model results are presented in
Appendix B.

Peak flood level impact mapping is presented in Appendix C.



4.3    Results Discussion
The site of the Hinterland Park is an active flow path of Cooroy Creek. Cooroy Creek flood waters
enter the site via breakout flow from the creek banks and via flow overtopping the road crest of
Maple Street. The modelling found that the original design of the hinterland park was expected to
create too much of an obstruction to floodwater through the site and this had the effect of raising
flood levels upstream and pushing additional floodwater in a north direction towards the industrial
area along Lowermill Road.

Modelling has demonstrated that care is required to ensure that the design of the park will not
increases flood risk on surrounding properties. Iterative modelling of various mitigation scenarios
has been used to develop several mitigation measures that have successful reduced offsite flood
impacts to an acceptable level. The results of this assessment should inform future design of the
park and it is recommended that the final park design configuration be subject to a further
assessment to ensure positive flood outcomes are achieved.

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J00318R1V1                                                                                      9