One of the most important environmental programmes undertaken in Hong Kong to improve the water quality of Victoria Harbour, the notion of this project is loud and simple – “Our effort is made to achieve a cleaner harbour for the future of Hong Kong.”
The project works include construction of 21-kilometres of deep sewage tunnels covering the following areas in Hong Kong from:
- North Point to Wan Chai to Sai Ying Pun
- Ap Lei Chau to Aberdeen to Cyberport to Sandy Bay to Sai Ying Pun
- Sai Ying Pun to Stonecutters Island
The tunnels are at a maximum depth of 160 metres below sea level. Works also include associated production shafts, drop shafts, ancillary civil and Electrical and Mechanical (E&M) works. Control over groundwater ingress during tunnelling at such great depths and preventing building settlement are great challenges for this project. Extensive ground investigation had been carried out by land boreholes, marine boreholes and horizontal directional coring at tunnel horizon to retrieve the ground samples and to obtain the hydrogeological information to aid the design. Most of the tunnels were constructed by drill-and-blast method, except a short section which was constructed by horizontal directional drilling. AECOM is responsible for the detailed design, tender documents preparation, tender assessment and construction supervision.
Click here to discover more about Harbour Area Treatment Scheme.
