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There are four maps being updated across part of the Moorabool Shire, which includes the towns of Bacchus Marsh and Ballan. These reflect the different sources of flooding, and provide information used to plan for infrastructure, housing and emergencies.

Underway Werribee River and tributaries (Lerderderg River and Parwan, Pykes and Pyrites creeks)
Underway Upper Little River
Underway Upper Balliang Creek
Underway Stormwater drains

This work is being supported by Moorabool Shire Council, as part of the Greater Melbourne Flood Information Program.

Council will inform you of any future consultation for other parts of the shire outside of Melbourne Water’s catchment area. This may be run by Moorabool Shire Council or Corangamite Catchment Managment Authority.

Thanks for your input

Thank you to everyone who shared their past experiences of flooding in Moorabool Shire. Your contributions have been passed on to our flood modelling specialists, who will contact you if they have questions about the information you supplied.

Consultation for this stage of engagement has now closed. To be notified by email when the updated flood maps are available for your feedback, select the 'follow’ button at the top of this webpage.
Consultation ran from 4 to 24 August 2025. During this period:

Flooding was reported at the locations indicated below.

Map of Bacchus Marsh and Ballan showing 4 locations where flooding was reported.

Next steps

Updating flood maps is a lengthy process that generally takes 12 to 18 months. Once this process is complete, we’ll share the updated maps for your review – so you can let us know if we’ve got them right before they’re finalised.

Diagram of steps involved in flood modelling program. Refer to table for a description.

Year Step Timeframe
1 Seek community experiences of past flooding and begin flood modelling Consultation: 1-2 months
1-2 Peer review of model and preparation of flood maps Planning: 12-18 months
2 Consult on updated flood maps and seek community feedback Consultation: 2 months
2-3 Review community submissions, validate and finalise flood maps Planning: 3-6 months
3 Publish final flood maps ready for use in decision making and request authorisation for Planning Scheme Amendment Publishing: 1 month
3 Publish updated flood emergency management plans Planning: 2 months

To learn more about what’s involved and how the information is used, visit our flood modelling webpage.

To receive email updates on our progress, select the ‘follow’ button in the banner at the top of this webpage.

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Melbourne Water respectfully acknowledges the Bunurong, Gunaikurnai, Taungurung, Wadawurrung and Wurundjeri Woi-wurrung peoples as the Traditional Owners and Custodians of the land and water on which we rely and operate.
We pay our deepest respects to their Elders - past, present and emerging.

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