Skip to content
SES - NSW State Emergency Service NSW Government - Office of Environment and Heritage

NSW Flood Data Portal

Guidance, Tools and Resources

Freeway No 5 South Western Freeway: Flood Model of Georges River Crossing

The lower Georges River Valley is subject to widespread flooding from time to time. The Moorebank-Milperra area, which is centred around Milperra Bridge, has been identified as a major floodway hazard zone due to substantial residential development on floodprone land.

Any restriction to the passage of floodwaters placed downstream of Milperra Bridge is likely to create an afflux (i.e. an increase in flood levels) in the Moorebank-Milperra area. The Department of Main Roads was therefore concerned as to the effects of its proposed South-Western Freeway crossing of the Georges River 3 km downstream of Milperra Bridge.

The Public Works Department's Manly Hydraulics Laboratory was engaged to construct and test a physical hydraulic flood model of the area in order to determine the afflux caused by the bridge structure during a 1 in 100 year flood.

This report provides details of the investigation and gives model test results and conclusions.

Additional Information

Field Value
Title Freeway No 5 South Western Freeway: Flood Model of Georges River Crossing
Publication Date 1 March 1985
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Council/LGA Canterbury-Bankstown Council
Author/ Prepared by Manly Hydraulics Laboratory
Publish date 27 June 2020
Update date 29 June 2020
Approval State Approved
Submitted for approval 28 June 2020
Submitted by Akhil Sud
Approved 29 June 2020
Approved by dstazic
Identifier d72488cf-537b-4e68-ab0e-d383fb1821b8