Attachment 6 - Stormwater Management Plan and Engineering Response. · MCU23/0078

6. NOOSA SHIRE COUNCIL CODES

     The relevant Noosa Shire Council Codes with respect to engineering aspects for assessment of the Development
     Application have been addressed. The codes will assist in assessing operational works requirements. The codes addressed
     in this report include: -


          −   Acid Sulfate Soils Overlay Code;
          −   Earthworks Code; and
          −   Water Quality and Drainage Code.


     The completed codes can be found attached in Appendix H of this Report.


7. SUMMARY

     This Engineering Report has demonstrated that the proposed development located at 28 Eenie Creek Road, Noosaville
     QLD 4566, can be developed in accordance with Engineering Best Management Practice, Noosa Shire Council guidelines,
     QUDM 2017 and the State Planning Policy 2017. The following points summarise the findings and recommendations:


         −    The proposed development site has no mapped flood levels or flags for building or development purposes and is
              expected to be at low risk of flooding from Eenie Creek;

         −    A local flood assessment was undertaken to ensure adequate protection from local flood events within the
              natural drainage channel in the environmental zone within Covent J adjoining the development site;

         −    New stormwater connections are proposed from the development site to the existing stormwater piped network
              located along the private access roadway and the adjoining environmental zone and natural drainage channel;

         −    Minor storm events will be collected by internal stormwater infrastructure within the development sites and
              surface car parking areas. This infrastructure will convey flow towards the surrounding stormwater infrastructure
              within the surrounding private access roadways, to ultimately discharge into Eenie Creek to the south;

         −    Major storm events will be conveyed via overland flow onto the surrounding private access roadways or
              adjoining environmental zone and natural drainage channel as per existing conditions;

         −    Stormwater detention is proposed across all three sites as there will be an increase to the impervious area across
              as a result of the proposed development, which will take the form of below-ground detention tanks;

         −    The local flood assessment also determined that the proposed development will increase flood event water levels
              downstream of the development site if stormwater quantity run-off is not mitigated to below those of existing
              levels;

         −    In accordance with the State Planning Policy and the Noosa Shire Council Planning Scheme, stormwater quality
              treatment measures are proposed as the site area is over 2,500m 2, and quality treatment devices in the form of
              bio-retention systems will be located across the three sub-catchments of the development site; and

         −    The characteristics of the three catchments across the development site remain unchanged due to the proposed
              development.




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