{"help": "https://data.gov.au/data/api/3/action/help_show?name=package_show", "success": true, "result": {"archived": false, "author": "Fairfield City Council", "author_email": null, "contact_point": "mail@fairfieldcity.nsw.gov.au", "creator_user_id": "c2fbbe4a-4ba0-4945-808b-67454605a4cf", "duplicate_score": 2, "geospatial_topic": [], "id": "26d58867-abe6-4411-866d-340fd25e2c91", "isopen": false, "license_id": "cc-by", "license_title": "Creative Commons Attribution 3.0 Australia", "license_url": "http://creativecommons.org/licenses/by/3.0/au/", "maintainer": null, "maintainer_email": null, "metadata_created": "2026-01-21T13:34:44.286076", "metadata_modified": "2026-01-21T13:34:51.168248", "name": "nsw-fdp-canley-corridor-overland-flood-study-report", "notes": "This report is structured as follows:\n\nSection 1 \u2013 Introduction\n\nSection 2 \u2013 Background:\n\nExplanation of the need for this overland flow study, of Fairfield\u2019s\noverland flow study program, the situation of this study area, the study objectives, and the\nhistory of flooding in the catchment\n\nSection 3 \u2013 Available Data:\n\nOverview of the data collection process for this study\n\nSection 4 \u2013 Catchment and Stormwater Model Development:\n\nExplanation of the\ndevelopment of the different hydrological and stormwater modelling approaches used in this\nstudy\n\nSection 5 \u2013 Hydraulic Modelling:\n\nBackground to the development of the two-dimensional\nhydraulic model used in this study\n\nSection 6 \u2013 Sensitivity of Hydrological Modelling:\n\nEvaluation of the different hydrological\nand stormwater modelling approaches and comparison of their results\n\nSection 7 \u2013 Flood Mapping Results:\n\nUse of the study modelling to derive flood extent\nmapping and flood risk precinct mapping\n\nSection 8 \u2013 Conclusions:\n\nKey conclusions from the study regarding modelling methodology\nand results.\n\nStudy Area\n\nThe study area for Canley Corridor Overland Flood Study is located south west of Orphan School\nCreek, between the suburbs of Canley Vale and Canley Heights and Cabramatta. The Canley\nCorridor catchment has a north easterly aspect and drains overland into Orphan School Creek,\nwhich is the main tributary of Prospect Creek.\nThe 258 hectare catchment has a range of land uses including residential, commercial and light\nindustrial. The upper and mid catchment area is largely medium density residential. The lower\ncatchment includes a range of commercial and industrial areas, separated from Orphan School\nCreek by an open space corridor.\n\nStudy Objectives\n\nKey objectives of this study are:\n<ul>\n<li>1) To test the sensitivity of overland flood modelling using different assumptions of the capacity\nof the existing stormwater drainage system. It will compare the drainage system at different\nlevels of detail, and evaluate the benefit provided by increasingly detailed models. Conclusions\nfrom this study will establish the methodology of subsequent studies for the remainder of the\nLGA catchments</li>\n<li>2) To identify the major overland flow paths within the Canley Corridor catchment study area.\nThe study area is detailed in Section 2.4 and includes parts of sub-catchments 13, 14, 15 and\n16 as identified in the preliminary city-wide Overland Flood Study (SKM, 2004). The Canley\nCorridor study area is shown in Figure 1-1.</li>\n</ul>\n\nOther objectives of the study are to:\n<ul>\n<li>Identify properties at risk of local overland flooding</li>\n<li>Assess provisional flood hazard to identified properties due to local overland flooding for the\n1% AEP (Annual Exceedance Probability) and the PMF (Probable Maximum Flood)</li>\n<li>Carry out field verification of identified overland flow paths at selected locations</li>\n<li>Prepare flood extent and flood risk precinct maps for the study area for the 1% AEP and PMF\nevents</li>\n<li>Produce flood results (flood level, velocity and flow) for the 5, 20, 100 ARI year and PMF\nevents</li>\n</ul>\n\nConclusions\n\nHydrologic Modelling Methodology\n\nComparison of the different hydrologic models indicates that while detailed modelling provides a\nmore precise picture of flooding, this would not necessarily translate into a different assessment of\nflood risk, or in significantly different planning controls being applied. All three hydrologic\nmodelling approaches (Detailed DRAINS, Limited DRAINS and RAFTS) resulted in similar high\nflood risk areas being identified along the main overland flow paths, and reproduced the known\nhistorical \u2018trouble spots\u2019 within the catchment. However the simpler models tended to overestimate\nflood risk due to coarser representation of flow travel times and artificial concentration of flows at\nfewer inflow boundaries.\n\nProduction of a detailed DRAINS model including all pits and pipes in the catchment was\nestimated to be four to five times more expensive than production of a limited DRAINS model, and\napproximately 14 times more expensive than production of a RAFTS model. This reflects the\ndifferent amount of survey data required and the complexity of the model construction.\nThe preferred approach identified by the study is a limited DRAINS model representing larger\nsized pipes in the stormwater network. This approach can be as acceptable in determining\nsignificant areas of risk as a detailed DRAINS model approach, if the extent of the modelling\nstormwater network reflects known trouble spots in the catchment, and represents the major\nelements of the trunk drainage system.\n\nCanley Corridor Flood Behaviour and Risk\n\nPeak flood depths on most properties are less than 0.5 metres, although there are some areas in the\nupper catchment where depths are between 0.5 and 1.0 metres. Similarly, flow velocities across\nmost properties are generally below 0.5 metres per second, although higher velocities are seen in\nmany streets and across some upper catchment properties.\n\nA \u201cZone of Significant Flow\u201d has also been identified where it is important that overland flowpaths\nare kept clear. It contains much of the 100 year ARI extent in the upper catchment, where flowpath\nblockage caused by fences, large buildings and debris can significantly increase water levels and\ndivert water onto nearby properties.\n\nThese maps only represent flooding due to runoff from within the Canley Corridor catchment.\n\nThose parts of the Corridor along the banks of Orphan School Creek may also be at risk from\nmainstream flooding, generated in the upper Orphan School Creek catchment to the north and west\nof the Canley Corridor. Mainstream flood extents for Orphan School Creek are reported in the\nFlood Study for Orphan School Creek, Green Valley Creek and Clear Paddock Creek (Sinclair\nKnight Merz &amp; Fairfield Consulting Services, 2008).\nThe Canley Corridor Overland Flood Study has been successful in achieving its objectives which\nwere to:\n<ul>\n<li>test the sensitivity of overland flood modelling to different assumptions about the capacity of\nthe stormwater drainage system</li>\n<li>define flood behaviour and identify the major overland flow paths within the Canley Corridor\ncatchment, and</li>\n<li>identify properties at risk of local overland flooding and to prepare flood risk precinct maps.</li>\n</ul>\n\nThe study has also:\n<ul>\n<li>established methodologies for modelling and flood risk mapping for future overland flood\nstudies for Fairfield LGA</li>\n<li>provided maps which are more meaningful to Council officers, development proponents\nand the community</li>\n<li>provided a good foundation from which to prepare the floodplain risk management study\nand plan, particularly with regards to flood emergency response, as the next step in the\nfloodplain risk management process</li>\n</ul>", "num_resources": 1, "num_tags": 3, "organization": {"id": "d6ac6906-7852-4875-ba2b-7c0ec1f24ba3", "name": "fairfield-city-council-datansw", "title": "Fairfield City Council", "type": "organization", "description": "Fairfield City is 32km south-west of the Sydney Central Business District and covers an area of 104 square km, incorporating 27 suburbs. Located in Western Sydney, its neighbouring areas are Parramatta and Liverpool, as well as the councils of Cumberland, the new Canterbury Bankstown, Blacktown and Penrith.\r\n\r\nhttp://www.fairfieldcity.nsw.gov.au/\r\n\r\nThe impact of development in the past 50 years has resulted in severe degradation of the natural habitat and water quality in these creeks and wetlands that feed into the City's three catchments: \r\n\r\nThe Hawkesbury-Nepean Catchment to the west fed by the South Creek Sub-Catchment consisting of South Creek, Eastern Creek and Ropes Creek and the Georges River Catchment to the south and east fed by the sub-catchments of Prospect Creek and Cabramatta Creek. \r\n", "image_url": "", "created": "2025-06-24T04:51:54.501519", "is_organization": true, "approval_status": "approved", "state": "active"}, "original_harvest_source": {"site_url": "https://data.nsw.gov.au/data/", "href": "https://data.nsw.gov.au/data/dataset/nsw-fdp-canley-corridor-overland-flood-study-report", "title": "DataNSW"}, "original_name": "nsw-fdp-canley-corridor-overland-flood-study-report", "owner_org": "d6ac6906-7852-4875-ba2b-7c0ec1f24ba3", "private": false, "promotion_level": "0", "remote_last_updated": "2026-01-14 22:00:39.113294", "spatial": "{\"type\": \"Point\",\"coordinates\": [147.0179,-32.1618]}", "spatial_coverage": "New South Wales (NSW81093)", "state": "active", "temporal_coverage_from": "2025-12-17 02:16:48.407507", "temporal_coverage_to": "2009-12-01 00:00:00", "title": "Canley Corridor Overland Flood Study", "type": "dataset", "unpublished": false, "url": null, "version": null, "extras": [{"key": "harvest_object_id", "value": "b419a038-4405-439f-853a-c7a96d835d50"}, {"key": "harvest_source_id", "value": "9ebac586-8e51-4904-9f6c-d9b79726659a"}, {"key": "harvest_source_title", "value": "DataNSW"}], "resources": [{"cache_last_updated": null, "cache_url": null, "created": "2026-01-14T22:00:39.150712", "datastore_active": false, "datastore_contains_all_records_of_source_file": false, "format": "HTML", "hash": "", "id": "8c940ba7-4c38-4ba5-80d2-6e59a6b010d4", "last_modified": null, "metadata_modified": "2026-01-21T13:34:44.281886", "mimetype": null, "mimetype_inner": null, "name": "Canley Corridor Overland Flood Study", "package_id": "26d58867-abe6-4411-866d-340fd25e2c91", "position": 0, "resource_type": null, "size": null, "state": "active", "url": "https://flooddata.ses.nsw.gov.au/dataset/68abdd50-cad7-447c-859c-c93ed5a70d28/resource/915f594a-4eec-4ba1-8594-3d95a7aba2d0", "url_type": null, "zip_extract": false}], "tags": [{"display_name": "Canley Corridor", "id": "0f2187b8-de61-4eb9-a5d2-dd02c029c35f", "name": "Canley Corridor", "state": "active", "vocabulary_id": null}, {"display_name": "Canley Vale", "id": "84463fbb-f7f8-4d5c-9d52-f67ad372d0a1", "name": "Canley Vale", "state": "active", "vocabulary_id": null}, {"display_name": "hydraulic model", "id": "5ea1bf91-c991-4e1b-808e-2528b9741aa5", "name": "hydraulic model", "state": "active", "vocabulary_id": null}], "groups": [], "relationships_as_subject": [], "relationships_as_object": []}}