Sustainable irrigation for ‘world’s best address’

A rainwater recycling system has boosted the sustainability of Twin Waters Coastal Community on the Queensland Sunshine Coast, which was voted best residential address in the world by the International Real Estate Federation in 2004.

The Lend Lease master-planned development at Mudjimba, at the mouth of the Maroochy River, is centred on a 41ha recreational lake and surrounded by the Twin Waters Novotel Resort, golf course, parks and shopping village.

With a total area of 314ha, the Twin Waters Coastal Community has been developed with residential land precincts and gated communities that take advantage of the prime location, lake and resort lagoon, 8km of landscaped walking and bicycle tracks and 16ha of community parkland.

Adjacent to the Twin Waters Novotel Resort, Lend Lease created the award-winning Northshore Coastal Village and has recently started construction on the adjoining Beachfront Apartments, Houses and Villas.

Comprising three apartment buildings, eight villas and nine architect-designed homes, the Beachfront precinct has been sensitively integrated with the neighbouring resort.

As part of an ecologically sustainable approach to design, reliance on potable water usage has been reduced by the inclusion of the Rocla rainwater utilisation system for landscape irrigation.

A total of 383,500 litres of storage has been provided in five separate clusters of underground concrete tanks, spread around the development to harvest roof water from throughout the site.

Each tank cluster consists of an ecoRain® header tank configured with additional storage cells constructed from 1800mm diameter Rocla® concrete pipes with cast-in end walls, to provide the required volumes.

The Rocla® system was selected by Lees Hydraulic Consultants because the constrained site needed a solution with a relatively small footprint to allow minimum clearance to other services. Engineering consultants Cardno designed the system in association with Rocla Water Quality. The civil contractors, Shadforth Civil Engineering, were able to use standard pipe installation techniques, minimising the dewatering required while working below the groundwater table. The rainwater utilisation system provides an automated subsoil and surface irrigation of all landscaped communal areas.


Development:  Twin Waters Coastal Community Mudjimba, Qld.

Project:  Multiple rainwater reuse systems for irrigation of residential development.

Developer:  Lend Lease Developments

Installer/Contractor:  Shadforth Civil

Authority:  Maroochy Shire Council

Rainwater Utilisation Systems:  Rocla Water Quality