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Hong Kong Trenchless Pipe Rehab for Urban Flood Resilience
Dec.02,2025
Project Background
Hong Kong maintains world-class stormwater infrastructure as a global financial center. Since 1996, the HK$20 billion Drainage Master Plan has implemented critical upgrades:
• Over 3,000 km of drainage pipelines rehabilitated to enhance flood resistance
• Strategic diversion tunnels (e.g., Lai Chi Kok Tunnel) redirecting hillside runoff directly to sea
• Flood storage facilities like the 60,000m³ Happy Valley Tank, equivalent to 24 Olympic swimming pools
Operational Challenges
Three primary challenges confronted Hong Kong's drainage authority:
1. Maintaining 2,700+ km of aging pipelines without disrupting dense urban environments
2. Achieving 50-year storm resilience against increasing typhoon threats
3. Complying with stringent environmental regulations during repairs
Solution
Hong Kong's Drainage Services Department adopted trenchless UV-CIPP technology featuring EasySight's X120-UV Portable Curing System. Key technical advantages included:
• Non-excavation deployment avoiding road closures in commercial districts
• Eco-efficient operation with low VOC emissions and reduced energy consumption
Technical Workflow
The rehabilitation followed a four-stage process:
1. Condition Assessment: CCTV inspection identifying defects like joint failures
2. Liner Installation: Resin-saturated felt insertion through existing manholes
3. UV Curing: Uniform 360°curing via automated LED arrays
4. Quality Validation: Post-repair CCTV inspection and pressure testing
Key Outcomes
The project delivered measurable results across four dimensions:
• Infrastructure Integrity: Extended pipeline service life over 50 years
• Operational Continuity: Zero road closures or traffic disruptions
• Environmental Compliance: Met Drainage Services Department's low-carbon standards
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