Apdx 4 - SWMP

                                                                                                                             ingeniir

Method Calculations provides estimates of the current and developed flows for both the development site
(23 Coral Tree Avenue) and the neighbouring site (28 Banksia Avenue), although the flows rates presented
are considered conservative as the soils in this area are known to have infiltration rates of 125mm/hour or
better.


7.      FLOODING
The site is in an elevated position locally and regionally and is not known to have any flood risk. A review of
the Noosa Shire Council’s Intramaps (accessed 19/05/2022) indicates that the site is not affected by any
known flood or storm tide studies. Refer Plate 3 for an excerpt of the Council mapping.




               Plate 3: Noosa Shire Council Flood Hazard Area/Defined Flood Extent in the vicinity of the site (Site highlighted)


8.      CONCLUSION
The proposed development has been analysed to provide design requirements to meet local and state
authority guidelines for stormwater quality and quantity outcomes.

The proposed development can achieve the required design outcomes of the IPWEAQ by limiting site
discharge to Coral Tree Avenue to less than 50L/s during a 5% AEP Event and effectively maintaining site
stormwater discharge rates for all events up to and including the 1% AEP.

If you wish to discuss this report and analysis further, please contact Daniel Kenna.

Yours sincerely,



Daniel Kenna
Beng CPEng MIEAust RPEQ 15522 NER 3133685 EC 66121

for and on behalf of Ingeniir Pty Ltd

                                                   Ingeniir Pty Ltd | 221304-SMP-01
                     ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
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