Ormeau Ridge is an 890 lot residential sub division located adjacent to an
existing flood plain and within the Gold Coast / Brisbane "Green Belt".
Compensatory earthworks for flood mitigation and requirements to place
bio-retention basins above major storm levels presented technical challenges for
piped stormwater conveyance systems.
Mortons Urban Solutions was commissioned to undertake design, project management
and construction supervision of the project to fulfil part of the regions demand
for residential lots in the fastest growth corridor in Australia.
Restrictive floodplain dynamics presented opportunities to utilise the full
potential of 12d Dynamic Drainage Analysis (DDA), and permitted calculations,
iterations and interrelations that would be unthinkable in any other drainage
In order to fully utilise the site's
potential an end of line bio-filtration approach was adopted; however, this
presented additional problems with conveyance of large quantities of piped
stormwater. 12d's DDA facilitated a highly interrelated 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 (Q3
month) to be directed towards bio-filtration basins, whilst larger flows were
discharged directly into the floodplain, 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.
Liaison between Mortons Urban Solutions; Rob Graham and Geoff Thompson of 12d
Solutions led to further expanded capabilities of the DDA and Dynamic Network
Editor (DNE) to enable accurate and stable analysis that we continue to use on
various projects throughout Queensland and Northern New South Wales.
The development has obtained preliminary approval with the initial stages
granted subdivisional approval. Site works commenced in July 2010.
This project was a success due to the
perseverance of our design team and the willingness of 12d to advance their
The stability and ability of the DNE / DDA product is currently permitting rapid
and cost effective design solutions on many residential, commercial and
industrial developments up to 4,500 lots.
"Mortons Urban Solutions have consistently
delivered proactive and innovative solutions to challenging sites to achieve
sustainable outcomes for the Stockland product. In the design phase of
Ormeau Ridge they have use the latest software to deliver efficiencies in
stormwater management that have maximised developable land and reduced
Regional Manager (Stockland
Residential Development QLD
Gilbert and Sutherland - water quality
Cardno Lawson & Treloar - floodplain modelling
RPS - survey, town planning and urban design
Conix - Landscape architects
Excavations - Construction
Created by: Roger Brisbane
Position: Senior Civil Designer
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