{"help": "https://data.gov.au/data/en/api/3/action/help_show?name=package_show", "success": true, "result": {"archived": false, "author": "Port Stephens Council", "author_email": null, "contact_point": "FloodCertificates@portstephens.nsw.gov.au", "creator_user_id": "c2fbbe4a-4ba0-4945-808b-67454605a4cf", "duplicate_score": 2, "geospatial_topic": [], "id": "29802fa5-0b83-4b72-92d6-ebade9d083b2", "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": "2026-01-21T13:43:29.604064", "metadata_modified": "2026-01-21T13:43:36.134676", "name": "nsw-fdp-williamtown-salt-ash-flood-study-review-report", "notes": "The objective of the study was to assess the impacts of climate change on the baseline 1% AEP\nflood condition within the Williamtown / Salt Ash Flood Study area. Central to this was the\ndevelopment of a new two-dimensional hydraulic model of the study area, in order that the impacts\ncould be properly assessed.\nIn completing the flood study review, the following activities were undertaken:\n\u2022 Review of relevant studies regarding flood conditions and climate change impacts within Port\nStephens;\n\u2022 Site inspection to confirm the presence and configuration of key hydraulic structures;\n\u2022 Merging of the existing Williamtown / Salt Ash Flood Study and Williams River Flood Study\nmodelled to produce a composite model capable of properly assessing the impact of climate\nchange in the study area;\n\u2022 Updating of model topography with available LiDAR survey data;\n\u2022 Calibration of 1% AEP design event flood levels with the 4.84m AHD level from the Flood\nFrequency Analysis at Raymond Terrace;\n\u2022 Prediction of design flood conditions in the catchment using the developed model; and\n\u2022 Production of design flood mapping series.\nThe climate change scenarios that were considered were combinations of 2050 and 2100 sea level\nrise conditions with baseline, +10% and +30% flood flows. A sea level rise of 0.4m by 2050, results\nin around a 0.2m increase to the 1% AEP flood level in Fullerton Cove. A sea level rise of 0.9m by\n2100, results in around a 0.6m increase to the 1% AEP flood level in Fullerton Cove. For the 1% AEP\nevent peak flood levels in Fullerton Cove increase by around 0.1m and 0.3m for the 10% and 30%\nflow increases respectively.\nThe dominant flooding mechanism (in terms of peak design water levels) for the Williamtown / Salt\nAsh locality is mainstream Hunter River flooding. Under these conditions, Hunter River flooding\nresults in Fullerton Cove filling and discharging into the Tilligerry Creek floodplain, under crossdrainage\nstructures and through overtopping of Nelson Bay Road. The baseline flood level within the\nTilligerry Creek floodplain is increased from 1.2m AHD to 2.6m AHD, under the worst case climate\nchange scenario.\nThe flood levels along Windeyers Creek are driven by flow conditions in the Hunter River. Hunter\nRiver flood water provides a backwater influence in Windeyers Creek, which fills the storage area to\nthe east of the Pacific Highway. The total volume of water flowing from the Hunter River along\nWindeyers Creek determines the flood level reached in the storage area. A higher flood level in the\nHunter River will result in a higher flood level in the storage area. At this location, the sea level rise\nscenarios have little impact on peak flood levels. There is only a small difference between flood levels\nfor the baseline condition and the 2100 scenario. However, the increased flood flow scenarios do have a significant impact, with peak flood levels increasing by around 0.2m and 0.6m for the 10% and\n30% flow increases respectively. The baseline flood level at this location is increased from 4.4m AHD\nto 5.2m AHD, under the worst case climate change scenario.\nThe flood study review will form the basis for the subsequent floodplain risk management activities,\nbeing the next stage of the floodplain management process.", "num_resources": 1, "num_tags": 4, "organization": {"id": "fe8fe8ff-9dfe-4f2d-8627-c4cef675bd7b", "name": "port-stephens-council-datansw", "title": "Port Stephens Council", "type": "organization", "description": "Port Stephens lies in the Hunter Region and is situated about 160 kilometres north-east of Sydney. It contains a large natural harbour of approximately 134 square kilometres within the Port Stephens-Great Lakes Marine Park; its northern shoreline forms the boundary between the Port Stephens and Mid-Coast local government areas.\r\n\r\nThe estimated residential population Port Stephens Community Profile was 64, 807 in 2011.\r\n\r\nhttp://www.portstephens.nsw.gov.au/\r\n\r\nPortions of the Port Stephens Local Government Area (LGA) is affected by flooding. This is due to the presence of major river systems in the western regions of Port Stephens and the low lying topography as well as interactions with the coast and estuaries in the east.\r\n\r\nFlooding in the LGA is caused by:\r\n\r\n* river or creek banks being overtopped;\r\n* estuary levels rise and cover foreshore areas; and\r\n* stormwater drainage that is unable to cope causing overland flows (down streets or across other urban areas).\r\n\r\nCouncil manages land affected by flooding by:\r\n\r\n* undertaking studies that identify flood risk and flood levels;\r\n* undertaking floodplain risk management studies and plans that provide provisions for the management of flood prone land; and\r\n* assessing the compatibility of new development (and major renovations) with flood risk thereby encouraging development that is appropriate to the flood risk of the area.\r\n\r\nCouncil are currently undertaking the Williamtown Salt Ash Floodplain Management Study and Plan and the Anna Bay and Tilligerry Creek Flood Study.\r\n\r\nCouncil is also involved in the Paterson River Flood Study which is being administered and managed by Maitland City Council. Refer to Maitland City Council's website for further information.\r\n\r\nData from other neighbouring Councils Reports such as the Karuah River Flood Study 2010 and the Hunter River (Branxton to Green Rocks) Flood Study 2010 has been utilised by Council in the development of Flood Hazard Maps. These Reports may be available upon request from the neighbouring Councils websites.\r\n", "image_url": "", "created": "2025-06-24T04:46:42.886713", "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-williamtown-salt-ash-flood-study-review-report", "title": "DataNSW"}, "original_name": "nsw-fdp-williamtown-salt-ash-flood-study-review-report", "owner_org": "fe8fe8ff-9dfe-4f2d-8627-c4cef675bd7b", "private": false, "promotion_level": "0", "remote_last_updated": "2026-01-13 06:02:05.781221", "spatial": "{\"type\": \"Point\",\"coordinates\": [147.0179,-32.1618]}", "spatial_coverage": "New South Wales (NSW81093)", "state": "active", "temporal_coverage_from": "2025-12-17 02:11:36.355645", "temporal_coverage_to": "2012-02-01 00:00:00", "title": "Williamtown Salt Ash - Flood Study Review", "type": "dataset", "unpublished": false, "url": null, "version": null, "extras": [{"key": "harvest_object_id", "value": "5946d85e-f210-494e-8a4e-2b3017fc1e35"}, {"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": "2026-01-13T06:02:05.804611", "datastore_active": false, "datastore_contains_all_records_of_source_file": false, "format": "HTML", "hash": "", "id": "410ed6a3-4320-47a6-8852-16941645ab71", "last_modified": null, "metadata_modified": "2026-01-21T13:43:29.599644", "mimetype": null, "mimetype_inner": null, "name": "Williamtown Salt Ash - Flood Study Review", "package_id": "29802fa5-0b83-4b72-92d6-ebade9d083b2", "position": 0, "resource_type": null, "size": null, "state": "active", "url": "https://flooddata.ses.nsw.gov.au/dataset/93b8b6ed-fb30-4ae0-be91-a7631878d166/resource/69c5487f-527d-4cea-bf85-4e2a0bc02794", "url_type": null, "zip_extract": false}], "tags": [{"display_name": "Salt Ash", "id": "5c6dea82-38aa-4145-9e2e-16194d812d3f", "name": "Salt Ash", "state": "active", "vocabulary_id": null}, {"display_name": "Williamtown", "id": "a881333e-b3ba-4068-abde-f457f644d63d", "name": "Williamtown", "state": "active", "vocabulary_id": null}, {"display_name": "hydraulic model", "id": "5ea1bf91-c991-4e1b-808e-2528b9741aa5", "name": "hydraulic model", "state": "active", "vocabulary_id": null}, {"display_name": "hydrologic model", "id": "306ddc3f-3866-4055-8fd7-0e4cd32a2a1a", "name": "hydrologic model", "state": "active", "vocabulary_id": null}], "groups": [], "relationships_as_subject": [], "relationships_as_object": []}}