Swmp

 CONCLUSION
This Stormwater Management Report has outlined how the stormwater run-off from the site is to be managed to
comply with the relevant requirements and minimise any adverse impacts to the downstream catchments.

     •    The proposed roof area will be captured and drained to large in ground tanks provided under the driveway
          providing for both reuse and attenuation for the site. The excess run-off from the overflows will discharged
          via concrete bedded outlets into a new 600mm wide dish drain. The discharge of the dish drain will be
          provided with scour protection to prevent erosion to the downstream verge.

     •    The existing and proposed development site have been modelled for the critical design storm events for the
          site, which found that minor peak flow increases would arise for the modelled storm events. The small
          increase is mitigated by a 2,000L attenuation volume per dwelling, through which roof run-off will drain.

     •    A minimum of 3,000L of rainwater reuse storage will be provided for each dwelling with reuse plumbed into
          non-potable uses on site in accordance with the Noosa Council Sustainable Building Code. This will be
          provided in the form of 2 18kL in ground rainwater tanks within the driveway, which will also serve to provide
          the attenuation volume for the site.

     •    During construction, erosion and sediment control measures are to be implemented to minimise potential
          contaminants impacting the downstream receiving environment in line with the objectives of Appendix 2 of
          the SPP.

     •    As the development is a small residential site that does not significantly alter the pollutant generating
          characteristics of the site, stormwater quality treatment is not proposed for the development. Pollutants will
          nevertheless be eliminated from the discharge through the capture and reuse of roofwater.

     •    The proposed stormwater solution is considered to minimise any adverse impacts to the downstream
          environment arising from the stormwater run-off while also meeting the stormwater objectives for the
          development.




Project number 20230023                                                                                 Page 11 of 14
File 20230023 206 David Low Way SWMP.docx, 2023-10-17 Revision 1

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