Sorry meant to add http://www.Brisbane.qld.gov.au
And
http://Www.logan.gov.au

Check out the flood flag maps. Not just the flooded areas but look at the yellow shading which shows overland flow by street. parts of Logan are prone to flash flooding from creeks and runoff. The name “Waterford” is a bit of a clue

Check the excellent Ipswich flood website – I think it is

http://Www.ipswich.qld.gov.au/onlineservices/flood_effect

That Bremer river can get Nasty

Will message you some info

Interested to see who you went with.