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Drainage software helps flood plain homes

12d program helps with complex multi-faceted drainage system.

Complex drainage analysis from software 12d has played a vital role in a major new housing development in Queensland, Australia.

Ormeau Ridge is an 890 home residential development located adjacent to an existing flood plain and within the Gold Coast/Brisbane green belt.

Compensatory earthworks

Compensatory earthworks for flood mitigation and requirements to place bio-retention basins above major storm levels presented technical challenges for piped stormwater conveyance systems.

Contractor Mortons Urban Solutions was commissioned to carry out design, project management and construction supervision of the project to fulfil part of the region’s demand for residential lots in the fastest growth corridor in Australia.

Restrictive flood plain dynamics called on the full potential of 12d’s Dynamic Drainage Analysis (DDA).
Bio-filtration was being used to handle surface water run-off, but this presented additional problems with delivering large quantities of piped stormwater.

12d’s DDA created a highly inter-related system incorporating bio-filtration basins, piped drainage, multiple bi-directional pits and overland flow components, with each component affecting the functioning of the other.


A series of 16 bi-directional pits within the estate permitted low flows to be directed towards bio-filtration basins, whilst larger flows were discharged directly into the flood plain, thus allowing pipe and pit sizes to be minimised over many kilometres of pipe.

The result was a highly functional and cost efficient stormwater system.

“In the design phase of Ormeau Ridge, Mortons has used the latest software to deliver efficiencies in stormwater management that have maximised developable land and reduced infrastructure costs,” said Col Dutton, regional manager for developer Stockland Development.

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