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If you build outside the mapped overland flow area then you can pretty much ignore the overland flow. if you want to do other things in the overland flow like putting a shed, pool or retaining wall and fill then it can get messy, as the intent is to not redirect overland flow to affect your...

You can absolutely build within an overland flow area - not sure about subdividing but I imagine it's the same. Brisbane's planning scheme requires the habitable floor area of a building to be 500mm above the overland flow. The question is what is the actual overland flood height is, which...