RFI - Attachment 4 - Engineering Response Package · MCU22/0171

DME Projects Pty Ltd
P.O. Box 7481
Sippy Downs, QLD, 4556
Tel 0438 157 612
ABN 79 224 274 637

                                       Response to Information Request – 128 Gympie Tce Noosaville
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                                                                                      Western Flow Path

        Issue – Stormwater Management
        The submitted documentation does not include sufficient information for Council to assess
        how the proposed development will collect and release stormwater. The submitted
        documentation indicates that a stormwater pump will be used to discharge rainwater
        collected in the proposed northern strip drain to the proposed drainage outlet along Gympie
        Terrace. Council is unlikely to support the use of stormwater pumps.

Information Required
       12. Provide additional detail demonstrating how the rainwater collected on-site will be
           controlled, collected and released without causing scour damage to neighbouring
           properties and without the use of a stormwater pump. The additional detail must be
           prepared by a suitably qualified person (RPEQ – Registered Professional Engineer of
           Queensland) and include, but not be limited to:
           a. demonstrate that all other means of basement drainage have been exhausted;
           b. demonstrate how the basement will drain any incidental rainwater and rainwater
           captured from the strip drain during a power failure;
           c. provide additional detail on the proposed basement sump and automatic pump;
           d. demonstrate how the proposed basement sump and automatic pump will discharge
           to the street; and
           e. demonstrate the proposed southern-most strip drain can achieve the required
           minimum grade (1:200).

Roofwater and surface water catchments are generally free draining to Council stormwater
infrastructure in Gympie Terrace. A small surface catchment at the rear (north) of the site will
discharge as incidental sheet flows to Chaplain Park. This catchment is approximately 100m2 and
consists of pool, pool surrounds and pervious landscaped areas. Infiltration is expected to be high