RFI - RECOR Preliminary Stormwater Management Report - 20220078

 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 surface run-off is captured internally and discharge into the Council stormwater
          infrastructure on Wyandra Street as the lawful point of discharge.

         Retaining wall drainage is to connect to the internal drainage system, with the wall designer considering and
          implementing the recommendations of SCG’s report.

         Field inlet pits are provided within the development to capture upstream run-off and convey it through the
          development.

         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 a 4kL attenuation tank with a 53mm 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.

         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 quality targets required
          for the development.




Project number 20220078
File RECOR Preliminary Stormwater Management Report - 20220078, 2022-11-11                                       Page 13 of 16
Revision 2


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