Appendix D_Engineering Report

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The proposed development will discharge stormwater to the existing stormwater infrastructure
within Resort Drive and subsequently into the Noosa Springs Golf Course which contains a series
of gross pollutant traps, sediment basins and lakes containing deep zones and shallow
macrophyte zones. The lake system was designed for amenity, water storage for irrigation
purposes, flood mitigation and sediment and nutrient removal.

The above mentioned lake system also receives tertiary treated wastewater effluent from the
nearby wastewater treatment plant for the dual purpose of providing the Golf Course with
additional irrigation capacity, and to further treat the wastewater prior to being discharged
into the receiving water body of Lake Weyba. The lake system provides significant nutrient
removal for both incoming stormwater runoff and the tertiary treated effluent.

In addition to the existing stormwater quality treatment measures contained within the Noosa
Springs Development, it is proposed to provide on-site stormwater quality treatment measures
to protect and augment the existing drainage infrastructure and lake system within the Noosa
Springs development. The proposed on-site treatment assets are outlined in Table 5-6

                                 Table 5-6 – Proposed On-Site Treatment Assets

         Treatment        Treatment
                                                                     Description
           Level            Asset


                                              First Flush devices are to be fitted to the roofwater
           Primary/       First Flush         and downpipe systems for the proposed buildings on
          Secondary         Device            site. The first flush devices will discharge into the
                                              proposed landscaping areas within the site.


                             Gross            Humeceptor Gross Pollutant Traps will be
           Primary/
                           Pollutant          incorporated into the internal drainage system to
          Secondary
                            Traps             remove sediment, litter and hydrocarbons.



Refer Appendix H for the Humeceptor Maintenance Guidelines.


5.6 Flooding
Noosa Council Flood Overlay mapping indicates the site is not flood affected. Refer to
Appendix F for the Noosa Council Flood Overlay Mapping.




Engineering Services Assessment
Residential Development at Precinct E2, Noosa Springs, Noosa Heads