Refernce Documents - RAL25 0001

                     5.0       STORMWATER MANAGEMENT

                     5.1       Legal Point of Discharge


                     Engineering Drawing C6535/24/SK07 attached as Appendix C indicates the Legal Point of
                     Discharge (LPOD) and proposed stormwater drainage network for the development site.


                     Under existing conditions, stormwater runoff is conveyed in two directions
                           -   A westerly direction as sheet and channel flow to the western boundary and into
                               the adjoining property to the west.
                           -   A northerly direction into the existing flow path, crossing Hoy Road at the northern
                               boundary of the site.


                     The site currently accepts stormwater runoff via the existing flow path from minor
                     upstream external catchments to the south and east. It is proposed not to change the
                     existing runoff regime and maintain the existing flow path in its current form, except for
                     works proposed to the Hoy Road crossing of the central flow path.


                     It is proposed to upgrade the drainage under the existing causeway crossing of Hoy Road
                     where the central flow path passes to the north. The causeway currently features a
                     600mm diameter reinforced concrete pipe (RCP). It is proposed to raise the causeway by
                     100mm and provide 5 x 750mm diameter RCP’s. This will provide immunity to the
                     causeway for events up to and including the 10% AEP storm event.


                     This approach is considered appropriate for the development site on the following
                     grounds;
                           -   The existing waterway downstream of the site is heavily vegetated. No discernible
                               adverse impacts will result from proposed development works.




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Document Set ID: 23448644
Version: 1, Version Date: 13/01/2025