386c9db2-86f2-4f1f-ae3e-b1dd73502fb2 urn:uuid en UTF-8 nonGeographicDataset nonGeographicDataset 2025-06-23T23:38:23 creation ISO 19115 2016 North Parramatta Precinct 386c9db2-86f2-4f1f-ae3e-b1dd73502fb2 The flood study was undertaken in two stages. The aims of each stage of the flood study are: Stage 1 - Hydrological Analysis <ul> <li>Collate all the relevant data on Council's existing stormwater drainage system;</li> <li>Develop a hydrological model to investigate the drainage system performance for the 5, 10, 20, 100, 200 year ARI storms and the PMF;</li> <li>Identify the flooding problem areas for existing development conditions within the study area;</li> <li>Identify the flooding problem areas for ultimate development conditions (represented by all of the study area utilising OSD).</li> </ul> Stage 2 - Hydraulic Analysis <ul> <li>Estimate the extent of flooding and flood levels for the PMF, 20 and 100 year ARI floods for existing development conditions, and</li> <li>Estimate the 20 and 100 year ARI flood levels and extent of flooding for ultimate development conditions.</li> </ul> Study Scope The scope of the Stage 1 flood study was to use a hydrological model to estimate peak pipe and overland flows throughout the North Parramatta Precinct. The peak overland flows were used in the hydraulic modelling in Stage 2 to estimate peak flood levels and flood extents. Design Rainfall Intensities used for the estimation of peak flows were obtained from Baulkham Hills Shire Council "Design Guidelines for Subdivisions / Developments." Storm durations from 5 minutes to 4.5 hours were used to produce rainfall patterns from which the D NS model estimates peak pipe and overland flows. The results presented in this report are the <em>worst case</em> peak flow for each set of storm durations for a particular ARI storm. Where flood levels are noted, all levels refer to Australian Height Datum (m, AHD) New South Wales (NSW81093) 147.0179 147.0179 -32.1618 -32.1618 Darling Mills Creek North Parramatta Northmead hydraulic model North Parramatta Precinct - Flood Study documentDigital HTML North Parramatta Precinct - Flood Study Figures documentDigital HTML