Hong Kong West Drainage Tunnel starts operation

23 Aug 2012

After more than six years of design and construction, Hong Kong West Drainage Tunnel (HKWDT), the city’s longest facility of its kind, goes into operation.

The commissioning ceremony was held yesterday with representatives from the government, consultant and contractor taking part.

As the lead consultant to the Drainage Services Department (DSD), Arup carried out the design, pre-qualification, tender and construction supervision for the HKWDT which will greatly alleviate flooding risks in Central and Western District and Wanchai District thus minimising traffic disruption and disturbance to the public caused by flooding.

HKWDT sets numerous records and firsts for the city. It is the first one to use raise boring method extensively for dropshaft excavation in Hong Kong. Furthermore, the two tunnel boring machines (TBM) used for excavation of the main tunnel, at 7.2m and 8.3m diameter, are the largest in Hong Kong.  To shorten the construction period, TBM excavation and adit blasting were carried out concurrently – yet another first for Hong Kong.  These innovative techniques not only helped keep the project on schedule, but also minimised the impact on residents, traffic and the environment during construction and created a safer working environment.

“Arup has been contributing to the development of Hong Kong’s infrastructure for more than 30 years. We are proud of the successful delivery of this challenging project, which pioneered a lot of technical innovations for Hong Kong’s construction industry.”

- LM Lui, Arup’s East Asia Chairman

The biggest flood prevention project ever implemented by the DSD, HKWDT comprises 11km long main tunnel from Tai Hang to Cyberport, with an internal diameter ranging from 6.25m to 7.25m.  It has 8km of adits and 34 intakes to intercept upland flows from existing streams and drainage system at Mid-Levels.  The collected runoff will be discharged directly into the sea.



Jenny Ho
Level 5, Festival Walk 80 Tat Chee Avenue Kowloon Tong Kowloon Hong Kong

T+852 2268 3488


  • Hong Kong West Drainage Tunnel - ceremonyOpen gallery

    L M Lui, Arup’s East Asia Chairman (third from left) and other guests officiated at the Hong Kong West Drainage Tunnel Commissioning Ceremony.