Stormwater Management Plan MCU17/0014

BORNHORST + WARD | DOONELLA STREET UNITS




         2.2       EXISTING LANDUSE

                    The development site comprises of two existing lots, these being lots 30 and 32 Doonella Street with an area of
                    516m2 and 2003m2 respectively. Currently, the site contains two residential buildings, along with associated
                    driveways and footpaths. The remaining site area is landscaped with the property boundary girt with
                    vegetation. Refer to Figure 1: Locality Plan above.

         2.3        TOPOGRAPHY AND SITE DRAINAGE

                    Under existing site conditions, the site falls at an approximate average grade of 6.7% from the high point at
                    approximately RL 8.80m AHD at the north-west corner of the site, to the low point at approximately RL 4.50m
                    AHD in the south-east corner of the site. Stormwater runoff from lot 30 and 32 currently flows towards
                    Doonella Street in the minor and major storm events. There is no external catchment which currently flows
                    through the site. Infrastructure within Doonella Street is the lawful point of discharge for the two lots. See the
                    Noosa Shire Council Stormwater infrastructure Map Overlay in Appendix C for further information.

         2.3.1      Existing Flooding Conditions

                    In accordance with Table 13.12 of ‘The Noosa Plan: Natural Hazards and Natural Resources Overlays’, an AEP
                    of 1% is specified for the design flood level. The interactive mapping system within NSC’s plan confirms that
                    the development site is not affected by Noosa River, Lake Doonella or overland flow flooding. As a result of
                    this, it is expected that the site is at a low risk of flood inundation. Please refer to Tewantin & Doonan Natural
                    Hazard: Landslide & Flooding Overlay (Map OM9.3) in Appendix C and figure 2 below for further details.




                                                                                     DEVELOPMENT SITE




                                                      Figure 2: Noosa Shire Council Flood Overlay



 Bornhorst + Ward Pty Ltd
 Level 4, 67 Astor Terrace, Spring Hill, Qld 4000                                                                        Page 2
 Ph. (07) 3013 4699 / [email protected]
 A.B.N. 78 010 151 354