Recent legislation in New South Wales has led to the requirement under BASIX for rainwater tanks to be installed on new houses built in the state. This project in Nelson Bay required individual tanks to be constructed with each house.

Given the site restrictions on each lot, it was necessary to create systems that were long and narrow and could fit into the tight spaces. Above ground tanks was not an option due to the lack of space and for aesthetic reasons.

Each system comprises of an EnviroSump Filtration Unit that pre-filters water before passing into a 2000 litre Rainwater Harvesting tank. The tank is surrounded in a pre-welded liner that acts as a bladder to store water.

A pipe from beneath the tank feeds into a pump well that contains a submersible pump. The water is then used for toilet flushing. Excess water from the rainwater tank overflows into an infiltration tank.

The size of the infiltration tank varies depending on the roof area of the house. A 150mm pipe with end cap has been installed as an inspection point at the end of each system.