About
Visit Fee
Free
Highlights
The project involves the construction of a cavern complex within the mountain south of Lion Rock, covering a total area of approximately 1.1 hectares and a volume of 156,000 cubic metres. This facility will accommodate the relocated Diamond Hill Fresh Water and Salt Water Service Reservoirs (DHSRs) and their associated infrastructure.
Key components include the construction of the relocated DHSRs and two pumping stations within the caverns, along with the installation of approximately 13 kilometres of fresh and salt water pumping and distribution mains (ranging from 250mm to 800mm in diameter).
As the site is classified as a confined space, personnel entering the tunnel must have completed the Safety Training Course for Certified Workers of Confined Space. All other participants are restricted to the introductory session and a visit to the facilities located outside the tunnel.
Safety Requirements
Participants should prepare their own safety gears (including safety shoe, reflective jacket and safety helmet) and hold a valid safety Green Card.
Registration
The number of participants is strictly limited. Priority will be given to members of the AGS (HK). The number of attendees will be limited to 25 and the applications will be accepted on a first-come, first-served basis.
Successful applicants will be informed about 1 week before the event. CPD certificates will be provided. If you have any queries, please call Martin Yip at 6012 0019.
Book Prize
Professionals under 35 years of age are encouraged to submit a Book Prize Report (max. 500 words) on webinars and site visits arranged by AGS (HK).
Contributors to successful Book Prize Reports will be awarded a Book Prize that comprises of a book "Geology of Site Investigation Boreholes in Hong Kong" written by Chris Fletcher, and a coupon of HK$500 for Eslite Spectrum (誠品生活). The successful Book Prize Report will also be published on the AGS (HK) website to showcase your accomplishment.
Prior to report submission, please refer to the “The AGS Book Prize Reports – Assessment Framework”* on the AGS (HK) website. You may submit your Book Prize Report to our assessors by uploading the report file through the AGS (HK) website at https://www.ags-hk.org/book-prize. Should you have any questions, please contact us at agshk@meinhardt.com.hk.
*Link to the AGS Book Prize Reports – Assessment Framework:
https://www.ags-hk.org/_files/ugd/521a4c_b94496034732484687441cf4ed4d0bf9.pdf
Please note that neither the Association nor the parties concerned accept any liability in connection with the above event
Event Flyer
Keywords: Cavern
RECAP OF THE DAY
On Saturday, 06 June 2026, the AGS organized a successful technical visit to the Diamond Hill Caverns project. Focused on the relocation of the Diamond Hill Fresh Water and Salt Water Service Reservoirs into a cavern complex south of Lion Rock, the event was hosted by Binnies Hong Kong Limited and the Chun Wo–Sinohydro Joint Venture. This major infrastructure project features the excavation of a 1.1 hectare cavern complex to house the reservoirs and two pumping stations, alongside the installation of approximately 13km of water mains.
The visit commenced with an insightful project overview delivered by Binnies’ Resident Site Staff, including Mr. Wilson Lam (CRE), Mr. Alan Kwong (SRE), and their team. Their presentation comprehensively covered the project background, the scope of works—including the portal ELS and caverns works—as well as site constraints and construction challenges. Participants gained valuable insights into critical technical aspects, such as cut-and-cover, drained, and undrained tunneling techniques. The team also highlighted methods for overcoming limited working area, managing sensitive adjacent utilities, controlling vibration near the operating MTR lines, navigating underground geology, implementing ELS at the portal shaft, and executing typical drill-and-blast excavation cycles.
Following the technical briefing, the Joint Venture’s safety personnel introduced the site's safety protocols and the practical application of the Smart Site Safety System (4S) inside the tunnels. An engaging Q&A session followed, allowing attendees to explore the design approaches and construction difficulties encountered on-site. The event concluded with a guided site tour, offering participants firsthand exposure to ongoing construction processes inside the tunnel. Despite heavy rain during the visit, the event was a resounding success, significantly deepening the participants' understanding of complex tunneling practices and enhancing their professional expertise.
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Reference materials
Download the presentation slides and other reference materials below.
