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Events / Activities
 

 
Technical visit to Happy Valley Underground Stormwater Storage Site
 


Date, time & venue

2017-12-16;9:30am - noon;Happy Valley Racecourse and Recreation Ground


Jointly organized with IGEM (Far East District) 

Quota and Charge

Successful applicants will be notified the assembly point and time for the visit through e-mail.

Limited No of participant: 30 (First-come-first-served and priority will be given to members of Gas & Energy Division and IGEM)

Charge: Free

Remark: Participants should bring along a valid green card or HKIE membership card (corporate member) for the site tour.

 

Programme HighlightHappy Valley Underground Stormwater Storage Scheme

 

The Happy Valley Underground Stormwater Storage Scheme (HVUSSS) is a key flood prevention project of the Drainage Services Department (DSD). Since project commencement in 2012, 2 phases of works had been completed in 2015 and 2017 respectively. The scope of the project comprises the construction of an underground stormwater storage tank with a capacity of 60,000 cubic meters, which is equivalent to 24 standard swimming pools, a pump house and the associated drains.


This scheme aims at alleviating the flooding problems in Happy Valley and Wan Chai areas. In such busy and densely populated areas as Wan Chai, conventional drainage improvement schemes would require extensive upsizing of existing drains or laying of new drains, which will involve extensive road opening works, leading to disruption to the public and commercial activities. Congested underground utilities will also jeopardize the viability of the schemes. An underground flood storage tank will serve to temporarily store part of the stormwater entering the upstream drainage system, thereby attenuating the peak flow and keeping the flow to downstream within the drainage capacity and greatly reducing the risk of flooding to low-lying areas like Happy Valley. After heavy rain, the temporarily stored stormwater will be discharged back into the downstream drainage system.

Participants can explore more on the first-ever innovative design of a movable weir to control inflow and outflow of water to the storage tank during heavy rain and the water harvesting system to be developed to foster sustainable water supply. With such big scale of project, sustainable design concept is also certainly one of the big issues to cover.

 

The visit comprises 1-hour project background presentation and 1.5-hour tour to the underground stormwater storage tank. The visit provides a platform for participants to gain insights on the driving force of developing the stormwater storage area underground; innovative design features and engineering implications; project management and planning skills; constraints and challenges faced throughout the 5 year project scope.

 


 

Registration & Enquiries

 

Please register through the link of https://docs.google.com/forms/d/e/1FAIpQLSee5k_I4a86mvl5yEvs_BPmLeGovrOYgNhRY0RKknnnaTbpew/viewform

 

by 8 December 2017

 

Ms Mandy Lai (T) 2963 2305 (E) mandy.lai@towngas.com


REPORT                                                             by Ms Mandy Lai

Technical Visit to Happy Valley Underground Stormwater Storage Scheme

By Ms Mandy Lai

Jointly organized by the Gas & Energy Division and Institution of Gas Engineers and Managers Far East District Section, the captioned technical visit was held successfully on 16 December 2017. A total of 27 participants took part in the visit.

This scheme aims at alleviating the flooding problems in low-lying area of Happy Valley and Wan Chai areas. The scope of the 5-year project (fully completed in 2017), carried out by the Drainage Services Department (DSD), comprises the construction of an underground stormwater storage tank with a capacity of 60,000 cubic meters, a pump house and the associated drains. The underground storage tank temporarily stores part of the stormwater collected from the upstream catchment for attenuating the peak flow through the downstream stormwater drainage systems during heavy rainstorms. The stormwater would then be discharged through pumps and gravity drains to the outfall.

An in-depth presentation by the Project Team on the innovative and intelligent design of the system was conducted during the visit, followed by a site tour at the storage facility. The participants appreciated the sustainable design of the project, which has already won several awards in the engineering industry and worldwide competitions. The incredible shallow tank design and the adoption of movable overflow side weir system greatly reduce the design capacity of storage tank and the electricity demand for pumping stored water. What’s more, the exposed area has fully immersed into the landscape of Happy Valley, achieving a fashionable and green design. More importantly, our participants were impressed by this inspiring project, not only from the engineering point of view, but also from social point of view.

We would like to express our sincere gratitude to DSD for their marvelous arrangement in this fruitful visit.




Report

 
 

 
 

 

 
 
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