Att 4 - SWMP · MCU21/0117

                    2. 2. E X I S T I N G D R A I N A G E P A T T E R N S

                        2.2.1 Existing Stormwater Infrastructure

            Data obtained from the detailed survey and Council’s interactive mapping show that there
            is no existing stormwater infrastructure on either of the site frontages nor property
            boundaries. Table drains convey stormwater drainage from the street along both Elm Street
            and Pearl Street.

            The nearest stormwater infrastructure is an existing 300mm diameter pipe located on the
            southern side of Pearl Street, which is eventually conveyed through stormwater
            infrastructure on Lot 0 SP260162 and Lot 48 C56013 towards an open drain on Lot 5
            CP889589 to the north-east of the site.

            Stormwater within the northern verge on Pearl St is conveyed through table drains and
            driveway crossovers before being discharged beneath the driveway at 11 Pearl St into the
            concrete box culvert and subsequent 1350 diameter stormwater pipe that discharges to the
            open drain to the north.

            The surface run-off from the site drains towards the north-eastern corner of the lots into the
            adjacent properties along the north and eastern boundary. No natural drainage channels
            occur within the lots causing the stormwater to drain as overland sheet flow across slopes
            of typically between 3% and 6%. From the north-eastern corner of the lot, the external
            natural topography indicates the surface water is conveyed overland towards the open
            drain on Lot 5 CP889589.

                             2.2.1.1.        Roof Drainage

            Within Lot 2 RP 64750, the roof drainage from the main dwelling is collected in gutters and
            downpipes that appear to discharge toward the northern boundary as overland flow as no
            alternative discharge point including was located on site nor into the road reserve. Neither
            of the free-standing shed structures had gutters, so water from these areas would contribute
            directly to overland flows.




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