The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Hong Kong’s East Drainage Tunnel is designed to intercept stormwater in the upper parts of Hong Kong Island East and carry it to an outfall at Pak Sha Wan, easing pressure on downstream drains. The Hong Kong Government’s Drainage Services Department (DSD) awarded the project to the CRBC–Bouygues TP–VSL joint venture. Construction is planned to combine tunnel boring, blasting, drill-and-break and pipe jacking; the expected flood benefit has not yet been measured.
How the tunnel is intended to reduce flooding
The tunnel is an upstream-interception project: it is intended to collect runoff before it reaches downstream areas that could otherwise face greater pressure during heavy rain. Water will be diverted through the tunnel for direct discharge into the sea at Pak Sha Wan. The DSD describes this as part of its three-pronged flood-prevention approach under the Integrated Flood Management Strategy.
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At the contract-signing announcement on 18 August 2026, Director of Drainage Services Ringo Mok Wing-cheong said the project would intercept and divert upstream stormwater runoff for direct discharge into the sea, “thereby reducing the flood risks at downstream areas.” That is the project’s stated aim, not a measured result: the published sources provide no quantified flood-probability reduction or post-completion performance data.
Who is building it, and what is included?
The client is the Drainage Services Department of the Hong Kong Special Administrative Region Government. The contract was awarded to the CRBC–Bouygues TP–VSL (HKEDT) joint venture, comprising China Road and Bridge Corporation, Bouygues Travaux Publics (Hong Kong Branch) and VSL Hong Kong Limited.
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The DSD describes a roughly 3.6-kilometre tunnel, approximately 5 metres in diameter, running from Shau Kei Wan and Chai Wan to Pak Sha Wan. The wider works include seven intakes, six connection adits, one outfall and ancillary drainage improvements. These components connect local drainage catchments to the main tunnel and its coastal discharge point.
How construction is planned
The works are expected to use several methods suited to different sections and supporting works. Bouygues Construction lists tunnel boring machine (TBM) excavation, blasting, drill-and-break and pipe jacking. Dragages Hong Kong gives planned quantities for parts of the scope:
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- About 2.6 kilometres of tunnel excavation by TBM.
- The remaining tunnel length by drill-and-blast and drill-and-break.
- About 900 metres of pipe jacking.
- Approximately 1.4 kilometres of drainage improvements.
The project is listed as commencing on 5 August 2026 on the DSD project page; Dragages describes the start as August 2026. These are planned works and dates, rather than evidence of completed construction progress.
What the published cost figures mean
Different sources report figures with different bases. They should not be treated as interchangeable estimates of the same thing.
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| Figure | What it describes | Source and qualification |
|---|---|---|
| HK$2,156 million | Contract value | DSD contract announcement, 2026 |
| €173 million | Total contract value | Bouygues Construction announcement, 2026 |
| €94 million | Bouygues Construction share | Bouygues Construction announcement, 2026; converted using the reference HKD/EUR rate for August 2026 |
| About HK$2,718.2 million | Project estimate | DSD project page; publication date not stated |
Why completion dates differ by source
Published sources do not give one consistent completion date. Bouygues Construction’s announcement, the DSD contract-signing announcement and the Dragages project page state 2030. The DSD project page instead lists mid-2031. None of these sources explains whether the dates refer to different milestones, so the discrepancy remains unresolved.
Quick Recap
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