LATE RFI - Revised 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.

     •    Due to the low-density nature of the proposed subdivision and surrounding sites, and lack of downstream
          infrastructure, the internal drainage will rely on grading surfaces to discharge run-off as overland sheet flows
          from the lots.

     •    The site has been assessed against potential future development of the lots assuming a 40% impervious
          area. Modelling of the pre and post developed peak site run-off has found that the overall increase to
          impervious peak flows as a result of this level of development will not significantly alter conditions from their
          existing level, and therefore attenuation is not considered necessary for the future dwellings.

     •    A table drain upstream of a proposed access road will be provided along the eastern and northern property
          boundaries, to intercept upstream flows and run-off from the existing access easement and divert them
          around the future allotments. The discharge of this run-off will be dispersed by employing level spreaders
          along the western property boundary to ensure the stormwater from the site is discharged as sheet flow
          across the boundary, minimising potential flow concentrations or scour to the downstream property.

     •    During construction, best practice erosion and sediment control measures are to be implemented to
          minimise potential contaminants impacting the downstream receiving environment achieving 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.

     •    The proposed stormwater solution manages resolves a number of existing drainage issues within the site,
          and the development will not result in significant impacts to water quality or quantity, and is therefore
          considered to meet the Water Quality and Drainage objectives of the Noosa Plan.




Project number 20220217
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File 20220217 Pavilion St SWMP Rev1.docx, 2023-04-19 Revision 1

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