MCU21.0117 OPW21.0199-Att 4 Civil Eng · MCU21/0117

            18th August 2021

            Ref:      MCU21/0117 OPW21/0199

            Noosa Council
            PO Box 141
            TEWANTIN QLD 4565


            Attention:                          Wilhelm Koschade

            Dear Sir,

                         Re:                    Information Request
                         At:                    5 Pearl Street & 54 Elm St, Cooroy, QLD, 4563


            With reference to the abovementioned information request for the development
            application (ref: MCU21/0117 OPW21/0199), we have prepared an update to the
            engineering aspects of the submission to address the issues raised in the Request for
            Information as follows:

                    4. Please demonstrate that an on-going right to discharge through the downstream
                    land is available to the applicant, either through confirmation from the owner of the
                    land that the current management as an environmental/conservation area will
                    continue and permission to discharge is granted, or through confirmation from the
                    downstream landowner of agreement to register a drainage easement in favour of
                    the development site.

            The internal drainage network has been redesigned to discharge stormwater run-off from
            the site to the Pearl Street site frontage drainage system, being the legal point of
            discharge for the development. Please refer to the updated Stormwater Engineering
            Report and Roads and Drainage Layout Plan for further details.

                    5. Please provide revised sizing/modelling and associated engineering drawings
                    for the detention storage proposed for the development site, which achieves the
                    following:
                        a) Utilises a hydrologic model and is undertaken using the ensemble storms
                            approach of ARR2019;
                        b) Is undertaken generally in accordance with the procedures documented in
                            QUDM Section 5.6.2;
                        c) Demonstrates no increase in peak flows for all events up to and including
                            the 1%AEP event, for the range of durations applicable to the downstream
                            land;
                        d) Accurately represents the site catchment areas and the position and
                            catchment of each detention storage within the site;
                        e) Accurately represents any external catchments conveyed through the site;
                        f) Accurately represents any areas of the developed site which bypass the
                            detention storage(s);




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