1909-13367 SRA referral response approved docs

1         INT RO D UCT IO N


Westera Partners Pty Ltd has been commissioned by Gemlife to prepare a Flood Study for the proposed
relocatable home park to be constructed on Lots 2 & 3 on SP115864 (the development site).
The proposed development site is impacted by a large external catchment with flows passing under the
Bruce Highway from the south west towards Myall St then continuing north through the existing channel
located within the development site on the Cooroy golf course.
The existing site is significantly higher than the bed level of the existing channel with an approximate
level at the property boundary of approximately 110m AHD with the adjacent bed level at approximately
104m AHD (determined using LIDAR information).
The development proposes to have access to the site via an access road off of Myall St. This road shall
cross the existing channel. This report shall detail the hydrology and hydraulics of the external
catchments draining through the channel adjacent to the development as well as the any other external
catchments downstream to determine the extent of flooding in the existing case. A proposed solution
(at the proposed crossing adjacent to the development) will then be modelled with the goal of ensuring
no afflux to adjacent properties or the development with impact to the existing channel to be minimised.

The development site falls within the local government area of “Noosa Shire Council” (NSC).

The proposed solution for crossing the existing channel determined at the preliminary stage is a double
span bridge.

The purpose of this report shall be to show that the proposed solution will not cause any nuisance to
adjacent properties or the development site.



2   SIT E D ES CR I PT IO N


      2. 1   Loc at i on an d L an d U se

The site of the proposed development is located on Lots 2 & 3 on SP115864. The proposed
development area is approximately 97,390m2. The existing site is zoned by NSC as ‘Rural, Open Space,
Recreation’. At the time of writing this report, the site is considered undeveloped.
The site is bound by Cooroy golf course to the north, east and south. Myall Street borders the western
boundary. An existing railway line is located downstream of the development. This could act as a flow
constriction during large flood events. Refer Figure 1 & Appendix G for further information.




                                              Flood Study                                             6
S19-007                                122 & 144 Myall St, Cooroy