Project Description
Contractor: Georgiou Group
Asset Owner: Water Corporation WA
Project Scope: Global Pipe HOBAS NC-GRP (Non-Circular GRP) including 625m of ovoid DN 750/ 500 and 600m of ovoid DN 600/400.
Project Background: Global Pipe, Australia’s sole distributor of HOBAS products successfully provided engineering solutions for this large-scale open trench drainage project in Perth, which was significant as it involved the delivery and installation of Non-Circular (NC) Profile Pipe also know as Ovoid. NC pipe is unique and is not often used in Australia and is typically used for rehabilitating and relining old brick sewers. Planning the urbanisation of the Calleya Residential Estate site presented many environmental challenges. The site was formerly a sand quarry and due to years of sand mining was significantly lower than the surrounding area – no overland flow path was available and the site was cut off from previous drains and a nearby lake. To overcome the site’s various environmental challenges, NC GRP was specified in conjunction with a stormwater treatment train to manage sediments entering the trunk drain.
Hydraulic testing found NC pipe has many benefits, such as improved low flow velocity, and it can be laid at flatter gradients than an equivalent circular pipe and still achieve the required minimum flow rate required for pipes to be self-cleansing. The use of NC GRP in this project was also the most cost-efficient solution as less filling and earth moving was required compared to an installation using circular pipe.
The Calleya Residential Estate is a145 Hectare Stockland housing development in the Western Perth suburb of Treeby – formerly known as Banjup. The Calleya Residential Estate will bring 1800 new homes to the area which is in a key growth corridor of the Perth suburbs.
