Information Request Response Lot 22 · MCU22/0038

Council Item 5 – Stormwater

The submitted documentation indicates that biobasin treated stormwater will “connect to the basement
drainage system for pump out to the external drainage system” and that “this is required due to the high
invert levels of the existing external stormwater network.”


The submitted documentation is unclear on:


§    how the water will be pumped from the basement into the lawful points of discharge;
§    the details of the proposed pump system (size, pipes, tanks, power supply, power redundancy, etc.);
§    the location of the proposed pumping system and the effect on carparking layout, including the
     proposed turn around area.


INFORMATION REQUIRED


Provide amended plans detailing the proposed stormwater management system, including but not
limited to:


    §    Location and dimensions of the proposed basement pump out system, including any required
         tanks, pipe sizes, etc.;
    §    How the basement pump out system will affect the proposed carparking arrangement and
         vehicle manoeuvring areas; and
    §    How the basement pump out system will be powered and what redundancy power
         arrangement/system will be put in place to ensure the basements won’t flood in case the
         principal system fails.


Our Response

MPN Consulting have prepared an attached letter responding to this specific RFI item, refer Appendix
B, with the relevant commentary extracted below.


        The proposed pump out tank will be located under the basement slab and will have no impact on
        the car parking layout of the basement. The pumps utilised will be submerged pumps which can
        be accesses through a maintenance opening in the basement slab. The final sizing of the tank will
        be completed as part of the detail design stage of the development.




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