Further Advice Letter Response_FINAL

Our Ref: 17155
Council Ref: MCU15/0109.04
Tuesday, 8 February 2022

Noosa Shire Council
PO Box 141
TEWANTIN QLD 4565
Attention: Patrick Murphy

RE:       Further Advice Request Response – Amended Site Maintenance Shed
          Proposed Residential Development at Precinct E2, 75 Resort Drive, Noosa Heads

In reply to the further advice request issued by Noosa Shire Council on 27 January 2022, we
provide the following information and response:

Item 6:       The proposed building changes and carwash use have the potential to impact on
              the downstream environment due to unsuitable runoff.
              Provide comment from the development’s design engineer that states that the
              proposed development does require changes to the existing stormwater drainage
              system. Alternatively, if changes are required provide preliminary plans of the
              changes.

Response: Morgan Consulting Engineers have completed an assessment of the stormwater
          runoff conditions for the proposed amended Site Maintenance Shed and carwash
          (drawing ref: 7043-DA50 as shown in Attachment A) as part of the Further
          Advice request (ref: MCU15/0109.04) response.

              Stormwater Quantity Assessment
              The proposed amendments to the Site Maintenance Shed consist of modifying the
              extent of hardstand and increasing the roof catchment. There is an increase of
              approximately 40m2 in impervious area due to the proposed building changes
              likely resulting in a minor increase in post development runoff flows.
              Utilising the Rational Method, a comparison of the volume of stormwater runoff
              from the current approved Maintenance Shed and the proposed amended Site
              Maintenance Shed was undertaken. With reference to the stormwater quantity
              analysis results (as shown in Attachment B) it has been established that there is
              a negligible increase in runoff from the site shed amendments that will result in
              a no worsening impact on the existing stormwater drainage system installed for
              Precinct E2.

              Stormwater Quality Assessment
              The proposed amended Site Maintenance Shed will direct all stormwater runoff
              from the roof and exposed hardstand areas to the constructed Bio-retention
              Basin 2, maintaining the stormwater quality treatment train for this catchment
              previously approved under OPW17/0612.


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