Appendix C - Stormwater Management Report

Refer to Appendix A Proposed Concept Plan for the proposed stormwater drainage layout plan illustrating the
concept described above.



          2.3.2 Stormwater Catchments
A schematic layout plan of the proposed development and its drainage catchments as described in the previous
sections is shown below in Figure 2.3 – Proposed Catchments Plan.




                                                  Figure 2.3 – Proposed Catchments Plan



     2.4. Flood Considerations
Review of the Noosa Shire Council Intramaps flood layers including the Flood Hazards Overlay has identified that
the site is located outside of any flood or inundation areas within the locality indicating it is not expected that that
the proposed development will be subject to flooding.


     2.5. Acid Sulphate Soils
The site is within the Land Subject to Acid Sulphate Soils (ASS) overlay on the Noosa Shire Council Intramaps service,
being within Area 1 (above 5.0m to 20.0m Australian Height Datum (AHD)). Survey indicates that the site’s low point
is at 5.38m AHD at the north-eastern corner of the site.

ASS management would typically be required at elevations below 5.0m, or where excavation volumes below 5.0m
AHD exceed 100m³. A preliminary estimate of the excavation requirements below 5.0m would include stormwater
drainage connecting to an existing IL of 4.89, and building footings near existing sewer services that would need to
be founded below the critical depth line, therefore disturbed volumes below 5.0m are likely to pose a low risk of
disturbing ASS containing soils or groundwater. It is not anticipated that an acid sulphate soil management plan will
be required for the proposed development.
Project number 20210216                                                                                        Page 7 of 13
File RECOR Preliminary Stormwater Management Report - 20210216.docx, 2022-02-01
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