City of Parramatta Flood Management Conditions

146. Works-As-Executed stormwater plans shall be prepared addressing the following: (a) A WAE survey shall be conducted and plans prepared showing the ‘as built’ of the complete on-site detention / WSUD systems, including (but not limited to) discharge point into Council system, storage tank (including all critical elements), all pipes and pits connected to the OSD system, overland flow swale and surface levels that control DA No.:DA/545/2024 Page | 62 surface flows to the OSD system and by design bypassing the OSD system. (b) The Work-As-Executed plans are prepared on the copies of the approved drainage plans issued with the Construction Certificate with the variations marked in red ink.…

84. A comprehensive construction phase soil and water management plan DA No.:DA/545/2024 Page | 42 must be prepared for the construction phase. This plan must consider how the site will be managed. It must focus on the protection of environment, existing infrastructure and human safety by addressing the following issues: a) Detailed plans of water quality treatment for construction phase dewatering and demonstrating expected compliance with the water quality parameters outlined elsewhere in this notice. b) All stormwater generated on the construction site must be collected and appropriately disposed of in a manner that does not increase the flood risk for the catchment area or degrade the…

57. Prior to release of the relevant Construction Certificate the Landowner shall submit a Water Management Plan for the development, consistent with the DCP and Water Management Control Plan for Melrose Park, for the approval of Council’s Group Manager DTSU, generally in accordance with the submitted stormwater and landscape designs but incorporating the requirements of this consent and following additional requirements: (a) Design of a system of rainwater capture and use on site (updated) and demonstration of at least 10% reduction in total annual discharge of rainwater from the site compared to the site in a natural undeveloped state. (b) Statement from the flood consultant/ architect…

50. Full engineering construction details of the stormwater system, including on-site detention (OSD) structures, pipe networks and calculations as per following points, shall be submitted for the approval of the PCA prior to release of the relevant Construction Certificate: a. The stormwater drainage detail design shall be prepared by a Registered Stormwater Design Engineer and shall be generally in accordance with the DCP for Melrose Park, the civil drawings approved by this consent and with Council’s Design and Development Guidelines, The Upper Parramatta River Catchment Trust On Site Detention Hand book (Fourth Edition), the relevant Australian Standards and the National Construction…

58. Prior to release of the relevant Construction Certificate the following requirements shall be implemented for those building frontages adjacent to a designated 1% AEP floodway (fully blocked condition) as marked with the magenta line on Lyall and Associates ‘Stormwater Drainage Strategy Minimum Habitable Floor Level Requirements’ Figure 1 Sheets 1-14 November 2024. The Flood Planning Levels are shown on this plan and are 500mm above the adjacent 1% AEP water surface levels for the adopted overland flow regime allowing for 100% blockage, climate change and model calibration factors. For frontages between the marked FPL levels interpolation acceptable to Council may be used. (a)…

60. Where building frontages are considered to be part of, or adjacent to, an overland flow path or flood storage area (in a 1% AEP event), all potential ingress points for floodwaters to basement areas must be protected to the adjacent 1% AEP flood level plus 500mm freeboard, or to the Probably Maximum Flood (‘PMF’) level – whichever is the higher. This must be consistent with frontages denoted by a magenta line and the noted PMF spot levels on Lyall and Associates PMF mapping Figure 2 Sheets 1-14 November 2024. Details of compliance with this condition and methods of flood exclusion from the DA/356/2025 17 basements must be submitted for Council approval prior to release of the relevant…

59. Prior to release of the relevant Construction Certificate the following requirements shall be implemented for those building frontages not adjacent to a designated 1% AEP floodway as marked with the orange line on Lyall and Associates ‘Stormwater Drainage Strategy Minimum Habitable Floor Level Requirements’ Figure 1 Sheets 1-14 November 2024. For frontages or part frontages not designated as a 1% AEP overland flow floodway (orange line) minimum floor levels shall generally be set at a minimum of 2% projected above the adjacent top of kerb to the building frontage, unless otherwise approved by Council. (Note: Footway surface levels and cross falls between the kerb and the boundary shall…

134. An evacuation report and procedure shall be prepared by an appropriate consulting engineer. This report is to demonstrate how the occupants of the development will egress the site in the early stages of a storm event, together with how they will seek refuge in a peak stormwater event (i.e. first floor of the building etc). The report shall be submitted to the Principal Certifying Authority prior to the issue of the first Occupation Certificate. A copy of the report shall be attached to the Occupation Certificate when forwarded to Council. Reason: To make property owners/residents aware of the procedure in the case of flood. WATER SENSITIVE DESIGN - POSITIVE COVENANT AND RESTRICTION

80. Prior to occupation, a detailed Flood Emergency Response Plan (FERP) must be prepared for the development. The FERP must include: • Flood event triggers and warning times • Evacuation routes and procedures • Measures to ensure the safety of occupants during a flood event The FERP must be prepared in accordance with Council’s Development Control Plan and the NSW Flood Risk Management Manual. Reason: To ensure flood risks are appropriately managed and safe evacuation procedures are in place during a flood event.