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NSW Flood Data Portal

Flood study

Horsley Creek Flood Study

Horsley Creek is located in the Shellharbour City Council local government area, on the New South Wales coastal plain approximately 100 km to the south of the city of Sydney. It drains an area of approximately 9 square kilometres of mostly urbanised land, discharging into the south-western corner of Lake Illawarra. Flooding in Horsley Creek and its tributaries is adversely affected at many locations by bridges, culverts and intrusions of development onto floodplains. Flooding in the lower reaches of Horsley Creek is in addition affected by the level of flooding in Lake Illawarra and sand build-up in the outfall reach into Lake Illawarra.

The primary objective of the Horsley Creek Flood Study is the development of a reliable, quantified understanding of existing flood behaviour within the catchment. This in turn leads to a number of secondary objectives including:

  • The collection and collation of a reliable body of data on the physical characteristics of the catchment and study area
  • The collection and collation of a reliable body of data on historic storms and flooding
  • The establishment of well calibrated and validated hydrologic and hydraulic models of the catchment and study area
  • The determination of flooding characteristics within the study area in terms of flood extents, flood levels, flow depths, velocities and hazard levels for a range of possible future flood events up to and including the Probable Maximum Flood
  • The identification of areas within the catchment subject to high hazard or high frequency flooding for specific consideration in the subsequent Floodplain Risk Management Study

Additional Information

Field Value
Title Horsley Creek Flood Study
Publication Date 27 September 2011
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Council/LGA Shellharbour City Council
Author/ Prepared by Rienco Consulting
Publish date 12 June 2019
Update date 1 July 2019
River Basin 214 - Wollongong
Approval State Approved
Submitted for approval 13 June 2019
Submitted by Akhil Sud
Approved 1 July 2019
Approved by dstazic
Identifier 5cca72fa-94b8-4ea4-ac02-3a9401cb7019