Keeping harbours clean
GHD Limited and Auckland Transport are the winners of the 2012 Engineering Excellence Award for Excellence in Environmental Practice for their Tetra Trap design, which prevents the flow of road pollutants to Auckland’s waterways and harbour via the stormwater system. The Tetratrap is a kind of screen which improves the capture of litter and contaminants. It can be retrofitted to catchpits and reduces the discharge of pollutants, sediments and heavy metals into the environment. With no moving parts, the filter screens are easy to maintain, require no special cleaning regime, can be manufactured locally, and are fully recyclable. The project raises awareness for cities elsewhere on the benefits of a simple but effective solution to reduce the extent of stormwater contaminants and gross pollutants from entering receiving environments. There is already international interest with the possibility of the traps being used soon in Australia.