{"help": "https://data.gov.au/data/api/3/action/help_show?name=package_show", "success": true, "result": {"archived": false, "author": "Central Coast Council", "author_email": null, "contact_point": "ask@centralcoast.nsw.gov.au", "creator_user_id": "c2fbbe4a-4ba0-4945-808b-67454605a4cf", "duplicate_score": 2, "geospatial_topic": [], "id": "3f12e52a-7c12-4a8d-96d1-74a1267e7242", "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": "2026-01-21T14:54:41.552390", "metadata_modified": "2026-01-21T14:54:48.015757", "name": "nsw-fdp-middle-creek-pearl-beach-floodplain-risk-management-study-report", "notes": "Middle Creek is a small watercourse that drains through the village of Pearl Beach on the New South Wales Central Coast. The creek is an ephemeral stream that drains a 58.3 ha catchment that\nis mostly undeveloped and which extends back from the coast to the escarpment (refer Figure 1).\n\nAvailable anecdotal and recorded data indicates that flooding has occurred on many occasions,\nmost notably in January 1989, April 1989, February 1990 and January 1992. This flooding was\nparticularly severe in the vicinity of the Diamond Road crossing of the creek (refer Figure 1) and\nled to significant damage to properties that adjoin the lower reaches of the creek. This and the ongoing risk has led to the development of a Floodplain management plan.\n\nThe \u201cexisting flood problem\u201d relates to those areas of the existing floodplain where damages are\nlikely to arise as a consequence of flooding. It concerns existing dwellings and properties that\nwould be inundated during a flood, as well as all associated infrastructure within the floodplain,\nincluding roads and utility services.\n\nIn this context, the \u201cexisting flood problem\u201d is usually addressed by structural measures which\naim to modify flood behaviour and thereby reduce flood damages.\n\nFLOOD DAMAGES\n\nData defining the floor levels of residential dwellings located along Middle Creek was provided\nby Gosford City Council. This data was used with peak flood levels generated from flood\nmodelling to determine the depth of flooding in the vicinity of each building. This allowed the\ndepth of \u2018over floor\u2019 flooding to be determined (if any). The flood affected dwellings along\nMiddle Creek are identified in Figure 4.\nEstimates of the flood damages associated with each of the 200, 100, 50, 20, and 5 year\nrecurrence floods and the Probable Maximum Flood (PMF) are listed in Table 3. The number of\nproperties predicted to be inundated during each flood are also listed. All damage costs are\nexpressed in 2007 dollars.\n\nIMPLEMENTATION OF THE PLAN\n\nThe following floodplain management strategies are recommended for implementation under this\nFloodplain Risk Management Plan. Further details of the actions associated with each strategy are\nprovided in Table 6\n
    \n
  1. Construct two low level flood levees at the rear of properties between 10 and 16 Emerald\nAvenue, Pearl Beach.
    2. \n
  2. Encourage landowners to establish a Rivercare group and seek assistance from the Natural\nHeritage Trust and Hunter-Central Rivers Catchment Management Authority to undertake\ncreek corridor management activities. These activities would include vegetation\nmanagement, bed and bank stabilisation works and small-scale works to increase channel\nconveyance.
    3. \n
  3. Install a piped stormwater system along Pearl Beach Drive to reduce the magnitude of\nstormwater runoff carried by Middle Creek during large flood events.
    4. \n
  4. Update Development Control Plan No.162 (Residential Development at Pearl Beach) to\ninclude additional flood related development controls for the Middle Creek floodplain (refer\nSection 3.4.1), and incorporate changes into the new Citywide DCP. Strengthen all related\nexisting Council planning and development controls.
    5. \n
  5. Monitor the extent of landscaping and bed or bank stabilisation works within the Middle\nCreek floodplain in order to enforce the proposed requirements of the Gosford Citywide DCP.
    6. \n
  6. Develop a formal Flood Emergency Response Plan for Middle Creek as a sub-plan to the\nGosford City Displan (2005), which is to include details of the recommended flood\nevacuation route and flood refuge.
    7. \n
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