20220171 - 14 Wyandra St 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 site roof run-off is captured internally and discharged into the Council stormwater
          infrastructure on Wyandra Street as the lawful point of discharge. Remaining areas of the site will rely on
          infiltration into the typically sandy soils of the locality in a manner consistent with the existing drainage
          conditions.

     •    The existing and proposed development site have been modelled for the critical design storm events for the
          site, which found attenuation would be required. Provision of 3kL of attenuation storage per unit with a
          42mm low flow orifice and 100mm high flow outlet was found to provide mitigate the development such
          that there will be no increase to existing peak flow discharges from the site for the modelled storm events.
          The attenuation will be provided within a 5kL rainwater reuse & attenuation tank, with 2kL allocated for
          rainwater reuse, and the remaining 3kL attenuation site run-off.

     •    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. An erosion and sediment control plan shall be developed as part of a submission for Operational
          Works approvals.

     •    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.

     •    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 20220171
File RECOR Preliminary Stormwater Management Report - 20220171.docx, 2022-08-24                                Page 12 of 15
Revision 1


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