Town Planning Report - Expansion to Noosa Landfill

“Specialist services and practical solutions”



       The State does not provide flood hazard mapping but rather relies on the local government
       mapping. The subject site is affected by flooding under the Flood Hazard Overlay Map (refer
       Figure 13, below). The flood hazard area is within the middle of the existing landfill site and
       wholly across the subject land.




       Figure 5 – Extract of SPP Bushfire Mapping (Source: SPP Interactive Mapping)

       The applicant has engaged Hydrology and Water Management Consulting Pty Ltd, who has
       completed a flood assessment to inform the design of a proposed expansion of the RRA and
       the new enlarged HES Basin (refer Attachment 5A). The detailed flood models have been
       established and validated and used to create flood maps for the existing and proposed cases.
       The model has been re-run to cater for rare events, the results of which are provided in the
       additional Technical Memorandum (refer Attachment 5B).

       The modelling has determined the impact on peak design flood levels likely to be caused by
       the filling of the new RRA pad area. The hydraulic engineer has advised that there is a re-
       distribution of floodwaters in the floodplain downstream of the filling; however, there are no
       adverse impacts that are likely to affect any infrastructure on the site or surrounding area4.

       The proposed development for the improved RRA and HES Basin will not result in added risk
       to people and property. Further, the extent and depth of earthworks to be undertaken is
       governed by the outlet of the proposed HES Basin, which is addressed in the Stormwater
       Management Plan prepared for the site (refer Attachment 6).

       Other matters, such as the protection of water quality have also been appropriately reflected
       into the planning scheme and do not need to be considered further under the SPP. The
       detailed Stormwater Management Plan prepared is primarily intended to manage water
       quality to meet current environmental standards under the environmental authority for the
       site, while also accounting for flooding. The extent of flooding is not worsened by the
       proposed works and will not adversely impact other properties.

       4 Noosa Landfill RRA Flood Assessment, part 8




       22019 – Noosa Council Expansion of Landfill, November 2023                      Page 18