The Tunneling Slurry Method This method shall be used for sewer works exceeding 6 metres deep and in hard soil or rock.
The Tunneling Augering Method The construction method is similar to Slurry Method, the soil from the Tunnel Boring Machine (TBM) is removed by an auger train.
The Open Cut Method This method shall be used mainly for Tertiary Sewer and Property Connections which are laid less than 2.5 metres underground.
