{"help": "https://data.nsw.gov.au/data/api/3/action/help_show?name=package_show", "success": true, "result": {"author": "Canterbury-Bankstown Council", "author_email": null, "contact_info": "False", "contact_point": "info@www.cbcity.nsw.gov.au", "creator_user_id": "8d2ac61a-d63a-4456-a00d-b35fee4c4025", "data_state": "inactive", "id": "9911d999-2f58-47be-8f0c-386c56cb163a", "isopen": true, "jurisdiction": "New South Wales Government", "license_id": "cc-by", "license_title": "Creative Commons Attribution", "license_url": "http://www.opendefinition.org/licenses/cc-by", "maintainer": null, "maintainer_email": null, "metadata_created": "2025-12-17T00:26:52.506482", "metadata_modified": "2026-01-20T05:27:53.666366", "name": "fdp-punchbowl-catchment-flood-study-report", "notes": "#Study Area\r\nThe study area is located in south west Sydney and includes parts of the suburbs of Punchbowl,\r\nMount Lewis and Greenacre. It is an urban catchment that drains through a stormwater pipe network\r\nand the Sydney Water open concrete channel drainage system in a north-easterly direction towards\r\nthe Cooks River in the neighbouring Local Government Area (LGA) of Strathfield.\r\nIt is important to note that the Punchbowl catchment does not represent the entire (hydrological)\r\ncatchment to Juno Parade (at the Bankstown LGA boundary). The entire stormwater catchment is\r\nlocated in two LGAs; the western part of the catchment is situated in Bankstown City Council and the\r\neastern part is situated in Canterbury City Council, covering parts of the suburbs of Roselands, Wiley\r\nPark and Lakemba. This report focuses on the study area only, although the model was developed\r\nfor the entire catchment.\r\n\r\nFor the remainder of this document and for clarity, the Punchbowl catchment in this report refers to\r\nthe study area and is wholly located within Bankstown LGA while the entire catchment will be referred\r\nas the Punchbowl/Roselands catchment.\r\n\r\n#Outcomes from the Study\r\nThe main outcomes from this study include:\r\n\r\n* A database of all Council drainage assets within the study area;\r\n* Establishment of a computer model capable of assessing flood behaviour;\r\n* Information on flood behaviour under existing catchment conditions;\r\n* Indicative information on drainage asset performance for various storm events;\r\n* A property database including surveyed floor levels, flood levels and the resulting floor level\r\nimmunity, expressed in the magnitude of a storm event;\r\n* Predicted change in flood levels due to the potential impacts of climate change; and\r\n* A model that can be used to assess flood mitigation options and future development proposals.\r\n#Database of Drainage Assets\r\nAll drainage asset data collected by Council for the study has been incorporated into a GIS database.\r\nThis allows the data to be spatially represented across the study area and easily retrieved as\r\nrequired. Information in the database includes data for some 510 stormwater pits and 610 stormwater\r\ndrainage pipes or culverts. The database also contains model results, including information for each\r\npipe on the design event at which it is running full.\r\n\r\nOther catchment data, including aerial photography, property cadastre, building footprints and the\r\nterrain surface (based on ALS survey) is also incorporated into a GIS database.\r\n#Computer Modelling\r\nA numerical computer model was developed for the catchment to simulate flood behaviour, using the\r\nsoftware TUFLOW. Surface flows are represented in the model through a two-dimensional grid\r\ncovering the entire study area. The stormwater pit and pipe network is included as one-dimensional\r\nelements within this grid. The adopted grid size for this study is 2m, whereas the flood studies within\r\nBankstown undertaken prior to 2012 utilise a coarser grid size of 5m. The new grid size has been\r\nadopted in line with ongoing improvements in computer technology (in particular speed, memory and\r\nstorage) to provide higher resolution of the floodplain whilst allowing for manageable model\r\nsimulation times and file sizes. Full details of the modelling approach, modelling parameters and\r\nother assumptions are outlined in the Punchbowl Catchment Flood Modelling Report, which is\r\nincluded as Appendix C.\r\n#Property Database\r\nThis flood study also includes the development of a GIS property database, utilising floor level data\r\ncollected by Council and comparing these to flood levels for various design flood events. This\r\ncomparison provides a dataset on floor level immunity, which is a very useful tool for assessing the\r\nexisting flood risk. Additional information such as property ground levels are also provided as part of\r\nthe property database. A summary of the property database is presented in Figure 5-1.\r\n#Existing Flood Behaviour\r\nDesign flood behaviour has been computed for a range of floods, ranging from relatively frequent\r\nevents to more extreme floods.\r\n\r\nThe model produces a grid of results over the study area providing data on flood levels, flood depths\r\nand flood velocities. Flood level contours have also been prepared showing contours of flood heights\r\nthroughout the study area. This data is provided digitally and can be overlaid on base mapping such\r\nas aerial photos and cadastral plans showing property boundaries.\r\nTable ES- 1 summarises the number of properties at risk from above floor level flooding in the\r\nPunchbowl stormwater catchment within Bankstown LGA.\r\n\r\nAll flood model results have been provided to Council for incorporation into their GIS database. Much\r\nof this information is also included as A4 sized plans in Appendix C.\r\n\r\nIt is understood that once the Flood Study has been adopted by Council, the GIS information\r\nresulting from this Flood Study will be used for floodplain management purposes, including\r\nassessment of flood-related development constraints on properties. Potential flood mitigation options\r\nwill be assessed in the Floodplain Risk Management Study phase of the floodplain risk management\r\nprocess.", "num_resources": 1, "num_tags": 4, "organization": {"id": "944d909b-a568-4832-a17f-600fd95dc2f4", "name": "canterbury-bankstown-council", "title": "Canterbury-Bankstown Council", "type": "organization", "description": "A\u202fnew City of Canterbury Bankstown\u202fwas announced by the NSW Government on\u202f12 May 2016.\u202f The City of Canterbury Bankstown replaces the Bankstown and Canterbury Councils, and becomes the largest Council in NSW with 350,000 residents, and is in Sydney's south west.\r\n\r\nhttps://www.cbcity.nsw.gov.au/\r\n\r\nCouncil has a chapter in the Development Control Plan (DCP) - Part B12 - which deals specifically with Flood Risk Management in the Local Government Area. 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