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.