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Water Corporation Denham Tanks Project
BGC Contracting constructed a 200,000 litre elevated storage tank that holds drinking water and non-potable water, to supply Denham's dual reticulation scheme. The tank replaced the two existing 20,000 litre and 43,000 litre high-level tanks.
The $3 million tank was the final stage of a $7 million suite of works to secure Denham's local water supply and cater for future growth. This upgrade included the construction of an elevated tank approximately 18m high and 10m in diameter.
The project was competed 12 days ahead of schedule and achieved a 100% pass on the leak test on the first attempt.
The entire tank structure was manufactured at BGC precast facility in Kwinana, undercover to reduce risk of thermal cracking, and transported to site.
Due to the site remoteness and lack of local resources, the project used the strengths of the BGC Group by providing all the raw materials for the ready-mix concrete from its Perth quarries and cement plant. In addition the concrete pump and trucks were also sent from BGC’s Perth operations. This provided the project with the required quality assurance to meet the strict specifications. BGC provided innovation in constructing the elevated tanks by bolting four temporary beams to the top of the tower to support the tanks segments prior to post tensioning, thus eliminating scaffolding. The project was competed 12 days ahead of schedule and achieved a 100% pass on the leak test on the first attempt. The tank will feature a unique design, segmented to hold 100,000 litres of the town's drinking water supply and 100,000 litres of non-potable water supply used for toilet flushing and garden use. Until now, the town's supply was stored in two separate high-level tanks for each type of water.