UP to 3000 properties were partially inundated by water building up in Brisbane's stormwater drains before the January flood hit, an experienced water engineer told reporters this morning.
Max Winders said his firm's preliminary study into the possible use of backflow valves in Brisbane's stormwater drains showed thousands of properties, including many units were flooded because of stormwater rushing up stormwater drains.
''It was of the order of two or three thousand (properties), but it is not that they were all inundated at first floor level,'' Mr Winders said.
''A lot of them were unit properties and a lot had basements inundated,'' he said.
In a lengthy explanation Mr Winders said there were many properties in the Brisbane CBD and New Farm regions affected by backflow flooding.
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