Scg 33094(Swm)

6.2     Manage Allotment and Cross Allotment Flows:

  The adjacent site described as lot 2 on RP 77499 (No. 21 Sidoni St) fall towards shared boundary
  with the site. All existing cross allotment flows from the neighbouring properties must also be
  considered, managed and maintained. Clear unhindered drainage paths must be provided and
  maintained during and beyond construction. All constructed retaining walls must have effective
  drainage measures upslope and beyond the walls to relieve any sub-surface water pressure/build-
  up. These drains must be maintained and flushed out regularly. To achieve this we recommend
  bringing the upstream end of the drain to surface and capping off to allow future flush out.




7.0     FLOODING
  The Noosa Council Flood Search Certificate (Appendix E) confirms a defined flood event of 2.5m
  AHD. The proposed development will include a minimum floor level of 2.8m AHD to allow for 300mm
  freeboard as required by the Noosa Plan 2020.




8.0     CONCLUSION
  The proposed development has been analysed to provide the design requirements to meet the local
  authority guidelines for stormwater quality & quantity outcomes described in this report.



  The lawful point of discharge for the subject site is Council existing stormwater infrastructure in the
  Blakesley Street road reserve.



  Sediment generated during the construction phase is to be dealt with in accordance with a Silt and
  Sediment Control plan and is to be retained on-site throughout construction.



  The proposed development does trigger the State Planning Policy 2017, stormwater quality
  treatment objectives. Stormwater runoff from the proposed development will be drained through
  bio-retention beds located on-site. Stormwater pits are to be fitted with gross pollutant traps in
  areas prone to gross pollutants.



  The subject site is within a defined flood area. The minimum floor level is set a minimum of 300
  mm above the defined flood level.




 SCG Consulting engineers                           9                             SCG Ref: 33094(SWM)