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Flood study

Update of Narellan Creek Flood Study

The Update of Narellan Creek Flood Study has been prepared for Camden Council (Council) in order to update the definition of existing flood behaviour in the Narellan Creek catchment in light of various recent developments and the availability of additional datasets. Narellan Creek is situated in south-western Sydney approximately 35 km south-west of Parramatta. The local catchment covers an area of approximately 35 km2, and contains the suburbs of Narellan, Narellan Vale, Smeaton Grange, Harrington Park, Currans Hill, Mount Annan, Elderslie and Kirkham. Narellan Creek is a tributary of the Nepean River. The general approach and methodology employed to achieve the study objectives involved:

  • Compilation and review of available information, including previously completed flood investigations, streamflow gauge records, rainfall records, topographic mapping of the floodplain and details of bridge crossings and other structures;
  • Site inspections and interrogation of aerial photography and other geographical data in order to establish catchment roughness, slope and land-use attributes;
  • The collection of historical flood information, including records of peak flood levels for historical floods;
  • Review and adoption of the existing XP-RAFTS hydrologic model which simulates rainfall runoff processes across catchment and provides inflows for the hydraulic model;
  • Review of the existing TUFLOW hydraulic model which simulates the movement of floodwaters through the Narellan Creek catchment;
  • Update of the existing TUFLOW hydraulic model utilising additional datasets, and refinement of particular aspects of the model found to be unsuitably represented;
  • Additional calibration of the updated TUFLOW model to the February 2007 and June 2016 flood events; and
  • The determination of peak flood levels, depths and flow velocities across the Narellan Creek catchment for the estimated 50%, 20%, 5%, 1%, 0.5%, 0.2% Annual Exceedance Probability (AEP) design floods and the Probable Maximum Flood (PMF).

Additional Information

Field Value
Title Update of Narellan Creek Flood Study
Publication Date 29 September 2017
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Council/LGA Camden Council
Author/ Prepared by Public Works Advisory
Publish date 11 June 2020
Update date 12 June 2020
River Basin 212 - Hawkesbury
Approval State Approved
Submitted for approval 12 June 2020
Submitted by Akhil Sud
Approved 12 June 2020
Approved by dstazic
Identifier 46418ae3-888a-4dee-8e3d-8b978e814e3b