Attachment 4 - Stormwater Management Plan by O2 · MCU13/0251

7.            Summary
This SMP has been developed for the proposed commercial development located at 215 David Low Way at
Peregian Beach. A treatment train has been devised to ensure the relevant water quality objectives can be
achieved for runoff exiting the site, and that pre development peak flow rates can be maintained.

Based on this assessment, the following conclusions have been made:

         The relevant water quality objective for the site are load based reduction targets of:
              o TSS       80%,
              o TP        60%, and
              o TN        45%.
         These water quality objectives can be achieved by implementing a treatment train consisting of:
              o 4 bioretention systems providing a total of 56m² of filter area (at 0.4m depth).
         Detention of runoff will be required to ensure pre development peak flow rates from the site are
          maintained. A minimum storage volume of 98.8m³ is required to achieve this objective.
         To reduce the volume and frequency of runoff occurring, additional infiltration opportunities will
          be investigated prior to Operational Works Approval. Options for increased filtration include the
          use of leaky bases in the bioretention systems, stormwater pits and the proposed detention tank
          system.




STORMWATER MANAGEMENT PLAN – PEREGIAN VILLAGE MARKET                                                 Page 18

Scanlon Property Group
R002616