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

NSW Flood Data Portal

Guidance, Tools and Resources

Hawkesbury Nepean River - Impacts of Flooding on Communities & Infrastructure

This report investigates the consequences of flooding for assets and communities in the Hawkesbury-Nepean Valley between Regentville and Spencer. There is particular emphasis on the more highly developed floodplain between Regentville and Sackville which includes Penrith, Richmond and Windsor and other urban centres.

It builds on previous work undertaken for Sydney Water into the effects of Warragamba Dam on flooding in the Hawkesbury Nepean Valley. Data on assets and infrastructure has been updated to reflect 1997 levels of development wherever possible.

The paper evaluates consequences for a range of floods up to the probable maximum flood and identifies the most significant consequences. Consequences are categorised as tangible or intangible and direct or indirect. It evaluates the potential for different strategies to reduce different types of damages in different sized floods. It was assumed for the analysis that Sydney Water would build an auxiliary spillway around Warragamba Dam and the spillway would have less than a 1 in 500 chance of operating in any year.

Additional Information

Field Value
Title Hawkesbury Nepean River - Impacts of Flooding on Communities & Infrastructure
Publication Date 24 September 1997
Themes Land and Resource Management
Spatial Extent
© OpenStreetMap contributors
Council/LGA Hawkesbury City Council
Author/ Prepared by Molino Stewart Pty Ltd
Publish date 23 June 2020
Update date 23 June 2020
Approval State Approved
Submitted for approval 24 June 2020
Submitted by Julia Muniz de Miranda Sa
Approved 24 June 2020
Approved by dstazic
Identifier 6ca45d4d-1c0a-4aa2-8c4a-45eb2218485f