A Warrnambool councillor has called for the city to investigate whether more can be done to prevent the 14 homes still at risk of being flooded from being inundated.
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After a study found that 146 homes were in danger of being flooded above floor level in the Russells Creek and North Warrnambool area, about $4 million was spent to rectify the problem.
Flood modelling carried out after the works found that number has been reduced to 14, and now the council plans to amend the planning scheme to reflect the changes.
Cr Sue Cassidy flagged the possibility of more flood mitigation works .
"A business case would be great, if we could do one, to look at those 14 houses to see where we could actually do more work to try and get it below the floor level," she said.
"It is good to see that the works that were done with the culverts have helped a lot," she said.
The flood mitigation works, which were carried out in 2016, also reduced the number of properties at risk of flooding below floor level had reduced from 234 to 205.
The works also reduced the annual cost of damages from about $500,000 to less than $70,000.
Cr Mike Neoh said the benefits of the previous studies could be seen with the number of houses no longer at flood risk.
"There's certainly more than we can do," Cr Neoh said.
"We have to make sure that our modelling is correct so that we can zone each particular flood area in accordance with what data is showing so that we make sure there's no inappropriate building in flood zones and people who are purchasing in potential flood zone areas are aware of that."
The council's chief executive officer Peter Schneider said the proposed amendment to the planning scheme was developed in consultation with the Glenelg Hopkins Catchment Management Authority.
"Currently planning controls in the North Warrnambool/Russells Creek area are based on an out of date flood investigation from 1997," he said.
In a report to the council, the authority has suggested that further flood investigations were needed to understand stormwater flooding and its interaction with flooding from Russells Creek.
It also raised concerns about the potential impact of a small basin at Aberline Estate which was constructed around the same time the 2017 modelling was completed.
The council will seek the go ahead from the Minister for Planning to prepare an amendment to the Warrnambool Planning Scheme.