Narrabeen Lagoon Flood Study Report with Climate Change Scenarios

Northern Beaches Council's 2026 report updates flood behaviour for the Narrabeen Lagoon catchment, incorporating potential climate change impacts. The study defines flood levels, depths, velocities, and hazard categories for design events ranging from the Probable Maximum Flood to 50% Annual Exceedance Probability. It provides a holistic assessment by considering land use changes, lagoon entrance influence, and community consultation data.

Use Cases

• Calibrate hydrological and hydraulic models based on the study's design flood conditions for a range of AEP events.
• Assess flood risk and provisional hazard categories for properties within the Narrabeen Lagoon catchment.
• Evaluate the potential impact of future climate change on coastal and catchment-derived flooding behavior.
• Inform community consultation and floodplain management processes using historical flood behavior data collected in the study.

Strengths

• License is CC-BY-4.0, permitting broad reuse and adaptation.
• Report incorporates climate change assessment using latest guidelines and considers future catchment conditions.
• Analysis covers a full range of design flood events, including ocean-derived and catchment-derived flooding.

Limitations

• Data is presented in HTML report format; underlying tabular or geospatial data is not directly accessible.
• Column-level documentation and sample data are unavailable, requiring manual extraction from the report.
• Row count and file size are unknown, limiting suitability assessment for automated processing.

Provenance

Source

Northern Beaches Council

Collection Method

Compilation and review of existing information, community consultation, and development of hydrological/hydraulic models.

Time Range

Historical, existing, and future conditions (incorporating climate change).

Freshness

Last updated 2026-04-09 20:02:43.477420

Geography

Narrabeen Lagoon catchment, New South Wales, Australia.