Appendix G - Stormwater Management Report

RPS Project Management c/- Lutheran Services                                                      Page 8 of 10
PF80 - Cooroy Care Farm
28 May 2018                                                                                 Ref. No. 2017.0616




4      CONCLUSIONS & RECOMMENDATIONS
       ▪ The development site is not affected by flooding from any source however there are several
         existing overland flow paths which run through the site.
       ▪ The Bruce Highway Hydraulic Analysis prepared by GHD for DTMR indicates that the highway
         has safe egress in all rainfall events up to the 1% AEP with overtopping only expected in the
         PMPDF. In the event of this extremely rare flooding safe egress is available along the Bruce
         Highway in a northerly direction.
       ▪ The Legal Point of Discharge for the Site is to the existing creek/gully at the rear of the site
       ▪ Stormwater quality management is proposed, given the site is above the 2500 m 2 threshold in
         the State Planning Policy SPP Code: Water Quality.
       ▪ The development would need to implement a flow control / detention strategy to mitigate the
         possible runoff increase generated by the works.
       ▪ A detailed Erosion and Sediment Control Plan would be required to be implemented for
         construction.
       ▪ The vegetated and sloping nature of the site suggests the use of swales to maximize amenity
         and environmental sustainability