A new Gross Pollutant Trap (GPT) needs to be installed at the cul-de-sac end of Hume Street, Mayfield, and Launceston. The primary focus of this project is to greatly reduce gross pollutants (debris greater than 5mm) from passing downstream without causing upstream flooding due to head loss.

The GPT will be required to treat stormwater flows of up to 350 litres per second and provide bypass for stormwater flows of up to 2500 litres per second. The GPT will be placed downstream of the adjacent railway line within Crown land located at the cul-de-sac end of Hume Street. The placement of the GPT should consider access for maintenance, GPT efficiency, hydraulic efficiency and total cost of installation. The site is not subject to tidal or backwater inundation and must be trafficable by heavy vehicles.

This contract involves the design and construction for the supply and installation of the GPT at the Hume Street site, as well as all necessary works upstream and downstream of the GPT.