MCU21.0117 OPW21.0199-Att 5 Stormwater · MCU21/0117

            Roof run-off will be collected and flow via downpipes into four slim-line rainwater tanks with
            overflow into the internal drainage network within the site. Each tank is a nominal 5kL, with
            3.75kL allocated to reuse purposes and the remaining 1.25kL per tank being dedicated for
            attenuation. To minimise pollutants entering the tank, first flush diverters will be installed to
            divert the initial capture of roof water to irrigation of the vegetated areas on site.

            Finished surface levels will direct runoff to either stormwater pits or towards one of two
            bioretention areas at the east and west of the property. The bioretention areas will provide
            stormwater quality improvements to the run-off, as well as serving to provide additional
            attenuation.

            The attenuated run-off will be conveyed to a storage manhole to the south-east of the site
            from where it will be pumped off the site to the downstream receiving table drain. The
            transfer system (pump and drainage line) has been designed to ensure discharges are
            within the capacity of the receiving system.

            A stormwater drainage line will be installed along the south-western (upslope) boundary
            with Lot 1 on RP153798 with inlet pits to collect the surface run-off from the upstream
            catchments and divert it around the site, directly to the pump-out manhole. Similarly, a
            slotted drain will be installed across the proposed driveway at the property boundary to
            intercept upstream flows and convey them directly to the pump out storage area.

            The roof and allotment drainage system for the proposed site shall be designed to comply
            with:

                    1. Noosa Shire Council Planning Scheme Policy (PSP) - Engineering Design Standards
                       – Roads, drainage and earthworks;

                    2. The Queensland Urban Drainage Manual (QUDM); and

                    3. AS/NZS 3500.3:2015 - Plumbing and Drainage Part 3: Stormwater Drainage.

                       2.3.2 Stormwater Catchments




                                                                                                            Page 6 of 33
P +61 7 5211 1003           A 37 Mary St, Noosaville Qld 4566   E [email protected]        recorconsulting.com