Appendix B - SWMP, Flood Cert & Form 15

            Lot 5 on RP73672 has an 18.24m frontage which provides access to the property from 55
            Doonella Street. The site covers 649.4m² and contains a detached dwelling and small free-
            standing shed making up 240.6m² of roof area, along with 93.9m² of paved area. Ground
            cover at the rear of the property is predominately grass.

            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

            Data obtained from the Council’s interactive mapping does not identify any stormwater
            infrastructure within Doonella Street at the location of the site frontages, however the
            detailed survey has picked up two stormwater kerb inlet pits adjacent the driveways to each
            property. The pits were unable to be accessed, so invert levels and dimensions for the
            infrastructure are not known.

            The surface run-off from the site drains south on both properties towards Lake Doonella.
            Within Lot 4 on T16337, the site grades vary between up to 20% at the property access on
            the northern end of the site, to less than 5% at the southern end of the site. The northern
            end of Lot 5 on RP73672 falls at around 10% away from Doonella Street, towards grades of
            around 5% at the southern end of the site. No natural drainage channels nor internal
            stormwater infrastructure was identified by the survey, so it is believed that site run-off will
            drain as overland sheet flow towards the lake at the south of the site.

            The surface levels within the Doonella Street road reserve indicate that run-off from the
            upstream footpath and verge areas will typically drain into the properties as surface run-off.

            2.2.1 Stormwater Catchments

            A schematic layout plan of the existing drainage catchments as described in the previous
            sections is shown below in Figure 2.2 – Existing Catchments Plan




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