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G&S: Technical visit to Po Shan Drainage Tunnel – Landslide Sci-Tech Chamber, HK

Event organised by ICE

20 August 2022
09:30 - 12:00 HKT (GMT+8)
Po Shan Drainage Tunnel, Mid-levels
Hong Kong
Add to Calendar 20-08-2022 09:30 20-08-2022 12:00 false HKT (GMT+8) G&S: Technical visit to Po Shan Drainage Tunnel – Landslide Sci-Tech Chamber, HK Po Shan Drainage Tunnel, Mid-levels,

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In 1972, the catastrophic landslide at Po Shan Road in the Mid-Levels shattered numerous homes and took away 67 lives. Post-disaster investigation revealed that the Po Shan hillside was affected by high groundwater levels and was susceptible to landslides.

In the 1980s, the Geotechnical Engineering Office (GEO) of the Civil Engineering and Development Department (CEDD) installed horizontal drains in the Po Shan area to lower the groundwater table, thereby improving the stability of the hillside against large-scale slope failure. However, monitoring data in the early 2000s revealed that some of the horizontal drains exhibited a decreasing trend of water outflow and the groundwater levels could be rather high locally during periods of heavy rainfall. Subsequently, GEO designed an innovative and sustainable groundwater regulation system to control the groundwater level in the Po Shan hillside, entitled the “Po Shan Drainage Tunnel”.

The system comprises a pair of drainage tunnels (3.5m diameter and a total length of 500m) and a network of 172 sub-vertical drains. It is equipped with an automatic real-time groundwater monitoring system to facilitate the GEO to control the groundwater levels; so as to reduce the risk of major landslides and enhance public safety.

Participants will visit the drainage tunnel and a landslide sci-tech chamber to learn about the importance of slope safety in Hong Kong. There will be four galleries to be covered in the chamber, including Po Shan Memorial Gallery, Climate Change Impression Gallery, Landslide Wisdom Gallery and Drainage Tunnel Expression Gallery.


Po Shan Drainage Tunnel, Mid-levels
Hong Kong


Time: 09:30 – 12:00 (Hong Kong Time)
Capacity: 20

  • Registration will be confirmed on a first-come-first-served basis and priority will be given to Graduate and Student Members.
  • Only successful applicants will receive a confirmation e-mail.
  • Applicants with no-show records will be given lower priority in future G&S events.


Participants will be required to scan the "LeaveHomeSafe" QR code and to comply with the requirement of the Vaccine Pass before they are allowed to enter the venues.

  • All participants are required to prepare and wear masks and have their body temperature taken at the registration desk.
  • The event will be conducted in English.
  • Attendance certificates will be provided for this event only if attendees attend the whole event.
  • Applicants with no-show records will be given lower priority in future G&S events.
  • The above is subject to change without prior notice.

Adverse weather arrangement

The event will be cancelled or rescheduled to another date in case of a Thunderstorm; Amber or Red or Black Rainstorm Alert; or Typhoon Signal No. 3 or No. 8 or above is in force by Hong Kong Observatory at or after 7am. It may also be cancelled because of safety or other reasons.


The Institution of Civil Engineers (Hong Kong Association) shall not under any circumstances be liable or otherwise for death or any injury or for any damage to or loss or destruction of property or otherwise, in any such case arising from any accident or mishap, and whether during or after this event, in preparation for it, travelling to or from it or otherwise.

For more information please contact:

Crystal Fung