Att 4 - SWMP · MCU21/0117

                        2.2.1 Existing Stormwater Catchments

            A schematic layout plan of the existing drainage catchments as described in the previous
            sections is shown below in Figure 2.5 – Existing Catchments Plan.




                                                   Figure 2.5 – Existing Catchments Plan.



                    2. 3. P R O P O S E D D E V E L O P M E N T D R A I N A G E P A T T E R N

                        2.3.1 Stormwater Concept

            Under existing conditions, the stormwater leaves the property as overland surface flows into
            the adjoining properties to the east and north of the proposed development. The lawful
            point of discharge for the proposed development will be to the stormwater network in Pearl
            Street, which will have the benefit of reducing the impact of nuisance overland flows on the
            adjoining property owners and ensuring the runoff is discharged in a controlled manner
            into Council’s drainage network.

            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
            2.5kL allocated to reuse purposes and the remaining 2.5kL per tank being dedicated for
            attenuation. To minimise pollutants entering the run-off, 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 fall 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.



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