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Self-Guided tours on rivers and embankments

Looking for alternative adventures on holiday? The Drainage Services Department (DSD) takes you on an adventure to explore the city in a convenient way. DSD's facilities are located all over Hong Kong Island, Kowloon and the New Territories. Whether you are a tourist or a local resident, you can easily discover the wonderful features of Hong Kong's flood control and sewage treatment just by taking a walk! Let’s go!Kai Tak River TrailGreening and ecological elements were included in the Kai Tak River Improvement Works to revitalise this water body into an urban green river corridor that links the river closely with the local neighbourhood. DSD set up a trail along Kai Tak River in Wong Tai Sin district. It starts at Shatin Pass Road and ends at Prince Edward Road East with 10 panels in different locations along the 1 kilometre riverbank of Kai Tak River. History of Kai Tak River and information of the drainage improvement works are introduced to the public. Highlights:Preserve Old Masonry WallRoadside PlanterArtificial Rock PlanterSubmerged PlantingFish Shelters and Flow DeflectorsPrince Edward Road East Box CulvertTransportationStarting Point: Lung Yat House - Bus 9, 10, 11, 82X, 85M                      Choi Hung Road (Wong Tai Sin Police Station) - Minibus 70, 70A, 805S, 79MEnding Point: Yuk Kwan Street (near Ng Wah Catholic Secondary School) - Bus 3B, 3X, 5, 5C, 9, 111, 116, 203E / Minibus 70, 70AMore information of “Kai Tak River Trail”, please visit the website of DSD. Nam Sang Wai River Education TrailThe Nam Sang Wai River Education Trail starts at Castle Peak Road in Yuen Long, goes around Nam Sang Wai via the Yuen Long Bypass Floodway, new channel of Kam Tin River and Shan Pui River. The Trail is about 5.5 kilometres long and takes 2 hours to complete. There are 10 Exhibition Panels along the trail to provide information on river training works and ecological aspects of the rivers. Highlights:Engineered WetlandOld Channel of Kam Tin RiverShan Pui River FishpondMangroves on RiverbanksRamsar Site Water BirdsShort-leaved Malacca GalingaleTransportationStarting Point: Pok Oi Hospital - Bus 768, 68F, 76K                      Castle Peak Road – Yuen Long (near Pok Oi Hosptial) - Minibus 36, 37, 38, 75, 76, 78, 603Ending Point: Nam Sang Wai Road near Lamp Post No. AD0554 - Walk along Nam Sang Wai Road for about 12 minutes to reach the Pier by cable ferry, then walking for about 16-22 minutes to reach the Long Ping Station / Yuen Long Station More information of  “Nam Sang Wai River Education Trail”, please visit the website of DSD. San Tin Flood Protection SchemeSan Tin Flood Protection Scheme constructs the embankment surrounding the villages to keep floodwater away from the village. A stormwater drainage system is also provided within the village area to collect and convey stormwater to a stormwater storage pond. Area of the storage pond is about 16,400 square metres. When the water level in the pond reaches pre-set levels, the pump in the stormwater pumping station will start automatically, water in the pond will be pumped to the adjacent channel outside the embankment. Highlights:San Tin Stormwater Pumping StationFloating Photovoltaic System and Ecological Floating IslandSan Tin Polder Viewing PointTransportationStarting Point: Lok Ma Chau (San Tin) Public Transport Interchange - Bus 76K, 276B, 976 / Minibus 78Ending Point: Lok Ma Chau (San Tin) Public Transport Interchange - Walk about 40 minutes to reach the Lok Ma Chau (San Tin) Public Transport InterchangeMore information of “San Tin Flood Protection Scheme”, please visit the website of DSD.

Sustainable river channel project — Yuen Long Bypass Floodway

In order to mitigate flood risks in Yuen Long town centre, the Drainage Services Department (DSD) constructed a “canal”, Yuen Long Bypass Floodway. Constructed with quite a number of improvement designs and engineering technologies, this man-made channel has beautified the environment and provided a new habitat for numerous plant and animal species while minimising flood risks at the town centre.Intercepting 40% of the runoff in the Yuen Long CatchmentYuen Long Plain is a low-lying area with significant flood risks in the past. In 2006, the DSD completed the construction of Yuen Long Bypass Floodway at the south of Yuen Long Town. This 3.8 kilometres long and over 20 metres wide man-made channel can intercept 40 percent of the runoff in the Yuen Long catchment, which is diverted straight to Kam Tin River and then discharged to the sea without passing the nullah at the town centre. To control the water level of the Bypass Floodway and to prevent water downstream from flowing back into the channel, a system of dry weather flow pumping station and inflatable dam was built at the downstream end of the Bypass Floodway and ahead of its intersection with Kam Tin River. At times of heavy rainfall, the dam will automatically deflate and lower to allow flood water upstream to flow into Kam Tin River to reduce flood risks. Adopting a series of eco-friendly designsAccording to Engineer of the DSD, Mr Ng Yat-fei, while proactively enhancing the level of flood protection, the DSD has also strived to introduce the concept of river revitalisation. Various eco-friendly elements have been specifically incorporated into the design of Yuen Long Bypass Floodway to beautify the channel and promote eco-conservation. For example, its flow is directed to pass through different regimes to slow down the speed for providing a natural habitat for plants and animals. Besides, the DSD has also created spaces to artificially encourage plant growth at the bottom and slope of the Bypass Floodway. “Grasscrete” paving adopted downstream is an example. Cavities throughout the concrete surface at the bottom of this man-made channel are filled with soil for plants to grow, enhancing the channel’s aesthetic value with thriving greenery. Engineered wetland as large as 10 full-size football pitchesThe DSD has also engineered a piece of wetland in the downstream area of Yuen Long Bypass Floodway. With its 7 hectares area, the wetland is as large as 10 full-size football pitches. Various plant species are grown in this wetland, forming a favourable wetland habitat for birds, amphibians (such as frogs), bats, dragonflies, etc., which in turn enhances biodiversity. In addition, the dry weather flow of the Bypass Floodway will first pass through the oyster shell pond, crushed bricks and reed bed in the wetland for natural filtration and purification, reducing nutrients in the water to prevent red tides.According to results of continuous monitoring, over 130 plant species grow in the wetland and 115 species of birds were once recorded to have settled there. Since its completion, Yuen Long Bypass Floodway has not only been an upgrade of drainage capacity but also a great improvement to the overall habitat of the area. Disseminating information on river conservationConservation of river channels forms part of the work of the DSD, which has been disseminating relevant information through different means. One of the examples, says Mr Ng Yat-fei, is the guided tours of Yuen Long Bypass Floodway and the engineered wetland, which have been rather popular. Schools or organisations may enrol on the tours through the DSD’s website. With guidance and explanation from the docents, participants are able to get on-site knowledge about flood prevention works and biodiversity conservation. The DSD has set up the Nam Sang Wai River Education Trail that begins at Castle Peak Road in Yuen Long and winds around Nam Sang Wai. It takes about 2 hours to complete the entire trail of 5.5 kilometres long. Along the trail, there are information panels explaining the river training works and ecological aspects. You can also check out the “DSD Facilities Online Tour” on the DSD’s website to explore the DSD’s work on flood prevention and environmental protection through the 360-degree panoramic photos and albums of high-definition photos. (The video is in Cantonese) (The video is provided by Development Bureau)

Relocation of Sha Tin Sewage Treatment Works to caverns

Rock cavern development is one of the Government’s multi-pronged strategies to increase land supply and is of great importance to Hong Kong’s long-term development. The Drainage Services Department (DSD) has commenced relocating the Sha Tin Sewage Treatment Works (STW), which is currently located at the mouth of Shing Mun River, to the cavern site at Nui Po Shan of A Kung Kok at the opposite bank. The relocation will release the existing site for uses beneficial to people’s livelihood and improve the local living environment. It is currently the largest cavern development project in progress in Hong Kong. Staff members from the DSD are here to introduce the details of the works and explain how to enhance works efficiency by adopting new technologies.Releasing 28 hectares of land after relocationOccupying 28 hectares of land and handling about 250 000 cubic metres of sewage per day, the existing Sha Tin STW is the largest secondary sewage treatment works in the territory. The relocation can release the existing plant site for other development uses. The new Sha Tin Cavern STW will occupy 14 hectares of land, which is 15 times the size of the Stanley STW housed in caverns, and will be the largest of its kind in Hong Kong. Even with a smaller footprint, the new plant will have the same treatment capacity as the existing one, with the adoption of advanced sewage treatment technologies to meet the demands of the local population and to improve services for residents. Three stages of the relocation projectGeotechnical Engineer of the DSD, Mr Ko Ming-yuen, Elton, said the relocation project will be taken forward in three stages. Stage 1 works mainly include site formation works at the cavern portal area and main access tunnel construction; Stage 2 works cover the main caverns construction and upstream sewerage works; the remaining works comprise mainly the construction of sewage treatment facilities in the new caverns, and demolition of the existing Sha Tin STW. Stage 1 works commenced in February 2019 and the construction of the main access tunnel by drill and blast method is underway. The works are progressing on schedule and are expected to be completed by 2022 as planned. Construction of a temporary flyover to minimise traffic burdenRegarding the design, the caverns serve as natural barriers fully enclosing the sewage treatment facilities while maintaining the natural scenery of the hilly landscape. The DSD will also adopt odour control measures to further reduce the impact of the odour on the community to improve its environment. Besides, as explained by Engineer of the DSD, Mr Poon Sze-lim, Kenneth, the construction and demolition (C&D) materials generated from the tunnel blasting works needs to be removed by construction vehicles. To minimise the impact on the nearby traffic, particularly given that A Kung Kok Street is one of the traffic arteries in Ma On Shan, the project team has purposely built a temporary flyover across A Kung Kok Street. Using the flyover, construction vehicles can travel in and out of the construction site without using A Kung Kok Street and the pressure imposed by the works on the nearby traffic can be reduced. New technologies to enhance construction efficiencyThe project team has also adopted various new technologies, such as Building Information Modelling (BIM) and Design for Manufacture and Assembly (DfMA), to enhance the efficiency of the construction of the temporary flyover.BIM technology can present the works design and site environment in a three-dimensional (3-D) format, enabling the project team to grasp the details accurately and to identify and handle all sorts of potential problems more easily so as to facilitate amendments. Simulated exercises can also be conducted to improve the construction programme and the temporary road closure arrangement. With DfMA, the team is able to build the viaduct piers and foundation of the flyover at the site while components of the flyover are being prefabricated at the factory, thereby significantly shortening the construction time. With both technologies at play, night-time lifting and installation works were completed in two nights instead of six nights as originally planned, reducing the impact on traffic caused by late-night road closures. Close liaison with the communityBesides, to enable the public to gain a better understanding of the relocation project, the project team has always maintained close liaison with members of the community and took the initiative to share the work progress with them. A community liaison centre is set up by the roadside of Mui Tsz Lam Road near the construction site so that residents can enquire about details of the works project.The hilly terrain with strong rocks in Hong Kong is highly suitable for developing rock caverns, particularly on the urban fringe. We can use such “hidden” land resources as caverns to support the relocation of suitable public facilities so that surface sites can be released to provide more land for Hong Kong’s sustainable development. The above-mentioned relocation of the STW to caverns can bring multiple benefits. Other than improving the environment of the current STW site and the surrounding area, it will also release land for other uses beneficial to people’s livelihood at the same time. (The video is in Cantonese) (The video is provided by Development Bureau)

[Distinguished Public Officers] Michael, Engineer of Drainage Services Department

Winner of The Ombudsman’s Awards 2020 for Officers of Public OrganisationsCheng Chun Wai, Michael, Engineer/Kowloon of Drainage Services Department““Provide quality service to the public with a customer-oriented mindset and proactive communication.” (The video is broadcasted in Cantonese) "In January 2019, a defective sewer laid six metres underground on Bulkeley Street caused an incident of sewage backflow. Before and during the repair works, my team and I approached several members of the Kowloon City District Council and reported the work progress to the residents and shop owners affected by the incident. We were grateful for the understanding shown by all parties concerned, even though half of the Bulkeley Street had to be enclosed for the repair works, which were sometimes carried out in the small hours. The repair works were completed smoothly, and the effort of my team was commended by local District Council members." For more details of The Ombudsman’s Awards 2020, please visit the Office of The Ombudsman website.  

Drainage Services Department's BiM@D Technology and Training Centre

The Government has been encouraging the works departments to better utilise innovation and technology to boost productivity, improve built quality and enhance site safety. As early as 2015, the Drainage Services Department (DSD) started applying Building Information Modelling (BIM) technology to works projects to enhance the design and construction process. In 2018, the DSD set up the BiM@D Technology and Training Centre to further promote digital technology. In the paragraphs below an engineer of the DSD will introduce how the centre facilities can help review and improve project planning and design so as to deliver higher-quality wastewater treatment and stormwater drainage services to the public.Introducing BIM technologyIn recent years, the DSD has proactively promoted and employed BIM technology and related information technology for the planning, design and implementation of works projects. Electrical and Mechanical Engineer of the DSD, Mr Ian Leung, says that when compared with hand-drawn or computer-aided two-dimensional (2-D) plans, the BIM technology can present the design of the whole project in a three-dimensional (3-D) format, which is particularly important to drainage facilities that generally involve the design of more complex building structures and mechanical and electrical installations, BIM enables the project team to grasp every project detail more accurately.Overcoming graphical limitations and time-space constraintsBesides, BIM technology can accurately present the construction methods and workflows in sequential order, giving project staff a better understanding of the construction plans. Currently, several sewage treatment plants of the DSD are undergoing in-situ renovation. Staff members are adopting BIM technology to examine various structures of the buildings to check if there are any incompatibilities in the construction processes, monitor if the projects are implemented as scheduled and change the construction sequence if needed. Various professionals – architects, engineers and construction workers can overcome graphical limitations and time-space constraints by coming together in the same virtual space to discuss project design and construction details in a coordinated manner, so as to achieve an early resolution of all types of issues and raise the construction quality and efficiency. Advanced Virtual Reality CAVELocated in the Revenue Tower in Wan Chai, the DSD’s BiM@D is equipped with a Cave Automatic Virtual Environment (CAVE) system. The system, together with BIM technology, can present project design and construction site environment in a 3-D format, providing a highly realistic and vivid 3-D visual space that takes users virtually to the site. More importantly, the system allows the project team to grasp all sorts of information of the works project and surrounding environment more easily and accurately. Furthermore, as multiple users are allowed to “enter” the virtual environment at the same time, communication with the stakeholders can be enhanced.Point Cloud Technology for 3-D Scanning and SurveyingMr Ian Leung also introduces to us the use of the innovative Point Cloud technology to help with the planning and design of drainage projects. As he explains, the Point Cloud data acquired by colleagues of the Survey Section with 3-D laser equipment for scanning and photogrammetric surveying seem like a group of white dots at first glance when presented in CAVE. However, with specially made eyeglasses and the use of the BIM model, the site and its surroundings can be reproduced in detail accurately, which can help the project team plan the locations and alignment of the drainage pipes. This technology is vital to the planning of the village sewerage system since some areas in villages are rather narrow and the construction sites are very close to the residential areas. The application of Point Cloud technology can reduce the need for surveying and speed up construction progress.Application of the Internet of ThingsIn recent years, the DSD has also adopted the technology of the Internet of Things (IoT). In 2019, the Flood Control Section of the DSD and the Electrical and Mechanical Services Department (EMSD) jointly launched a trial scheme to develop a Smart Drainage – Flood Monitoring System in Sha Tin and Tai Po with the application of the Government-wide Internet of Things (IOT) Network (GWIN). The result has been very good. The department has decided to further extend the system to 10 locations that are susceptible to storm surges and overtopping waves.Innovation and technology will continue to develop and make progress in the future. The works departments will continue to proactively explore the application of innovation and technology at different levels and works stages, so as to help different experts grasp real-time data of the construction sites and related facilities more accurately to enhance construction quality and manage works projects more effectively, thereby benefiting members of the public. (The video is in Cantonese) (The video is provided by Development Bureau)

Community Building with a Harmonised “Hui” (Drainage Services Department)

To tie in with the new development in North-East New Territories, the Drainage Services Department will kick in to turn the existing Shek Wu Hui Sewage Treatment Works in Sheung Shui into the “Shek Wu Hui Effluent Polishing Plant”, with enhanced handling capacity and environmental friendliness.CO-DESIGN WITH THE COMMUNITY In the wake of an increasing demand for sewage treatment due to rapid community development and the public’s concern for ecological conservation and the use of public space, the project team, working with the spirit of "putting people first", has adopted a breakthrough "design thinking" approach and engaged in in-depth communication with the community in planning the upgrade of this strategic sewage infrastructure. It has turned the community into a project designer to address community issues together.In 2018, the project team launched a community-based co-creation project, "Community Design for Sustainable Development @ Shek Wu Hui Effluent Polishing Plant Public Space", to co-develop the scheme with the public. The project team also kept abreast of public needs through a series of “self-experiencing” and “multi-platform” public engagement activities, including street booths, interviews, as well as workshops and visits for members and representatives of the community. ACHIEVE "CO-USE" AND "COMMUNITY CONNECTION" With the change of time, the community has high expectations for public space. In this light, the project team co-designed the “Shek Wu Hui Effluent Polishing Plant” with the community with the idea of “co-use space”. Even though the additional land available for the facility measures only 2.5 hectares, the project team has been able to identify about 2 hectares of "co-use space” for the public. A lot of greening elements, a riverside walkway, a bird watching zone, an ecological garden and planting sites will be provided for public leisure, visits and educational facilities relating to water resources management. Extending the concept of "co-use space" to the peripheral areas, the project team also worked with the nearby residents and green groups in drawing two educational routes on the themes of "Sustainable Living in Sheung Shui" and "Impact of Water in District History", thereby immersing the facility into the community and achieving the goal of “social connection”.The project team and the community have joined hands to exemplify the benefits of Community Building with a Harmonised “Hui”. It not only meets the sewage treatment demand arising from population growth in the next 20 years, but also enhances the quality of living of the community as a whole. (The video is broadcasted in Cantonese) (For more details, please visit Sevice Excellence Website)

Promoting the Development and Application of Renewable Energy (Drainage Services Department)

"As an experienced propellant of renewable energy projects in the Drainage Services Department, I constantly ponder ways to introduce breakthrough improvements in this area for the department and our community." Drainage Services Department Senior Project Manager, Li Chung-leung, Ricky said."I often encourage my colleagues to proactively voice out effective and innovative methods and ideas, enabling the department to continuously enhance the renewable energy focused quality service culture. Inculcating the mindset of “You Can Do It”, we strive to overcome the challenges encountered during the application of new technologies and the operation of renewable energy facilities."Ricky said, "I encourage them to try boldly and verify carefully, inspire and lead colleagues to pay extra effort and exert team spirit to resolve problems." Today, the harbour in Hong Kong is so beautiful that citizens can enjoy swimming and experience the excellent water quality. This is the result of Drainage Services Department’s (DSD) years of hard work.In addition to sewage treatment and flood prevention, DSD has been actively developing and promoting the application of renewable energy in recent years, contributing to the sustainable development in Hong Kong.Rapid population growth coupled with the dramatic increase in economic activities have inevitably generated a large amount of sewage. DSD collects up to 2.8 million m3 of sewage every day, enough to fill up 1,120 standard size swimming pools. The collected sewage is then conveyed to sewage treatment works for treatment. The conveyance and treatment processes consume substantial amount of energy.The four major secondary sewage treatment works in DSD have been employing the latest technology to utilise the biogas produced during the sludge treatment process to generate electricity and heat for use within the sewage treatment works. To maximise the use of renewable energy, DSD sent staff on study visits to the United States, Germany, and other regions to learn from their experience and to explore effective ways of developing renewable energy in Hong Kong.Ricky said, "Apart from getting our job done, we are constantly exploring ways to bring greater benefits to the environment. Taking the Tai Po Sewage Treatment Works as an example, we need to pay over a million dollars for electricity every month. Could it be self-sustainable in energy?" Riding on the production of biogas during the sludge treatment process, DSD, in the spirit of “Daring to Try, Practising with Care”, actively explores ways to increase the production of biogas. Finally, in 2016, DSD and the Environmental Protection Department (EPD) jointly developed the “Food Waste and Sewage Sludge Anaerobic Co-digestion” Trial Scheme. As the Scheme was new to Hong Kong, the departments encountered many challenges during implementation. Electrical & Mechanical Engineer, Drainage Services Department, Cheung Kin-kuen said, "Westerners’ diets are mostly meat-based, therefore, protein is the main component of their food waste, whereas in Hong Kong, the composition of food waste is mainly carbohydrates. To ensure the viability of this technology in Hong Kong, we commissioned a local university to conduct DNA test for micro-organisms to confirm that the technology is feasible to be applied in Hong Kong. It is estimated that EPD will provide the Tai Po Sewage Treatment Works of DSD with a maximum of 50 tonnes food waste per day. The pre-treated food waste will undergo anaerobic co-digestion with the sewage sludge in the sewage treatment works. The Scheme utilises existing facilities of DSD, to harness the synergy effect in generating 30% more biogas and at the same time reducing the amount of digestate by 30%. The Scheme not only helps alleviate the burden on landfills, but also supplies a million kilowatt-hours of electricity to the sewage treatment works annually, which helps save around a million dollars in electricity cost annually. In addition, DSD capitalises on its own advantages by installing photovoltaic panels at different sewage treatment works and pumping stations. Siu Ho Wan Sewage Treatment Works is equipped with over 4,200 photovoltaic panels with an installed generation capacity of 1.1 megawatt. When it came into operation in late 2016, it was the largest of its kind in Hong Kong. DSD also set up a Renewable Energy Information Centre there. Guided tours are provided with the aim of enhancing public awareness of the government’s effort in the development and application of renewable energy. To promote wider use of solar energy, DSD is exploring the feasibility of installing hotovoltaic panels on the covers of the sedimentation tanks at the Stonecutters Island Sewage Treatment Works, which is the largest of its type in Hong Kong. However, the curvy surface of the sedimentation tank covers makes it difficult to install traditional photovoltaic panels.The then Senior Electrical & Mechanical Engineer, Drainage Services Department, Wong Ying-ying, Regina added, "There are thin film photovoltaic panels available in the market. We installed them on the sedimentation tank Number 9 as a trial. Although we encountered different technical problems in the process, we are confident that by enhancing the design, more photovoltaic panels could be installed on the covers of sedimentation tanks." The then Deputy Director of Drainage Services, Drainage Services Department, Mak Ka-wai, JP said, "The mission of DSD is to provide the public with world-class sewage treatment and drainage services. With a “Do it from the Heart” attitude, we strive to develop renewable energy. On average, we produce around 27 million kilowatt-hours of electricity a year, which is equivalent to 9% of our overall electricity consumption. According to statistics, Hong Kong’s potential in developing renewable energy is about 3 to 4% of the total electricity consumed. Although we have already far exceeded this figure, DSD will keep the momentum going. We hope that by around 2030, we could successfully turn the Tai Po Sewage Treatment Works into a “zero emission” facility, achieving the goal of “waste-to-energy”. I believe that with the concerted efforts of our staff, we will be able to achieve it." (For more details, please visit Sevice Excellence Website)

Staff are reporting for duty to the new short-term positions

Under the Job Creation Scheme with its purview in connection with the Government’s Anti-epidemic Fund (AEF), a young beneficiary under the Scheme, currently working as an assistant engineer for a contractor engaged by the Drainage Services Department (DSD), will share with us her experience in job hunting and her involvement in the public works project.The Government continuing to create jobs and recruit staffTo relieve the worsening unemployment situation due to the COVID-19 pandemic, the Government has set aside $6 billion under the AEF to create about 30 000 time-limited jobs in the public and private sectors in the coming two years. According to the SCS, Mr Patrick NIP, the Government has planned to provide 21 700 jobs, of which 13 700 will be created in different government departments. So far, 2 500 new colleagues have reported for duty. He says that in view of the pandemic, the Government will continue to create jobs and recruit staff. In order to stabilise the economy and create time-limited jobs, it is most important that we stand united, make concerted efforts and do our parts to win the fight against the pandemic as soon as possible.Promoting the creation of new short-term positions in private sectorThe DEVB and departments under its purview have created a total of more than 6 500 time-limited jobs, including government positions and those created through procurement of services from consultants or contractors under existing or new contractual arrangements. Miss LEUNG Wing-yiu, Yoyo, started to work as an assistant engineer for a works contractor in the end of May. Hers is a short-term position created in the non-government sector. She last worked for an airport development project but had to find a new job as the project was about to complete. She could not help worrying because many enterprises were laying off employees or cutting back on recruitment amid the pandemic. She feels very lucky and happy now that she can continue to work as an engineer, a job that she likes. Accumulating experience to enhance competitivenessMiss Yoyo LEUNG says that the contractor that has hired her is participating in the DSD’s expansion of Sha Tau Kok Sewage Treatment Works project, giving her an opportunity to learn about the operation and construction procedures of sewage works, such as how the Building Information Modelling technology can be used to enhance the accuracy of project planning, and the DSD’s work in flood prevention which comprises the innovative adoption of the Blue-Green Infrastructure (a modern stormwater management concept) to uplift Hong Kong’s flood resilience. These can help increase her knowledge in drainage infrastructure, which can in turn strengthen her competitiveness in the job market.Encouraging new colleagues to accept new challengesProject Manager of the contractor, Mr FAN Chun-wai, Raymond, welcomes Miss Yoyo LEUNG to their work team as she not only shares various tasks, but is also careful and meticulous especially in reading documents. Mr Raymond FAN hopes that she will embrace this job opportunity to take up new challenges and learn the process from design to construction. He believes the work experience thus gained will benefit her career development. Besides, the contractor has hired several frontline colleagues and workers under the Job Creation Scheme of the AEF, thereby providing job opportunities amid the current difficult economic conditions. Facilitating expansion of sewage treatment worksDSD’s Engineer, Mr LEUNG Ka-kay says the Department is pleased to have employed several young engineers through the contractor under the AEF to take part in the challenging project of expansion of sewage treatment works. The Expansion of Sha Tau Kok Sewage Treatment Works Phase 1 includes the construction of a temporary sewage treatment plant within 18 months followed by the in-situ reconstruction of a new sewage treatment plant to increase the treatment capacity by three times to 5 000 cubic metres per day.(The video is broadcasted in Cantonese) (The video is provided by Development Bureau)

Advanced technologies to rehabilitate pipes

There are more than 4500 kilometres of underground stormwater drains and sewers across Hong Kong. Many of those in the old districts have been in use for over 30 years. The sewers, in particular, are more prone to ageing and deterioration due to prolonged exposure to corrosive gases brought by sewage. Drainage Services Department (DSD) has gradually rehabilitated the high-risk underground pipes by adopting a pipe repair method that requires no excavation of pipe trenches or road surfaces in order to alleviate inconvenience caused to the public during the works. Gradual rehabilitation of old pipesSerious wear and tear will cause pipe collapse and road subsidence, bringing adverse impact on traffic, environment and public safety. Since 2017, the DSD has initiated comprehensive planning for the phased investigation and rehabilitation of pipes that have been assessed to be of high risk and formulated a territory-wide replacement and rehabilitation programme. However, we have to face a number of challenges in carrying out drainage improvement works in urban areas. Hong Kong is congested not only with people and vehicles, but also with various underground utilities such as gas pipes, communication facilities and water pipes. The traditional “open trench” rehabilitation technology may inevitably affect traffic and residents. The benefit of the new trenchless technology introduced by the DSD in recent years is that pipes can be replaced and rehabilitated without the need to open up an entire road section. Only a temporary shaft is neededAccording to Engineer of the Project Management Division of the DSD, Mr CHEN Ka-yin, the trenchless pipe rehabilitation works only need to excavate a temporary shaft at an individual location to facilitate the insertion of new pipe material into an old pipe to form a new pipe. Under this method, the excavation requires less open space and a shorter duration of works, allowing traffic to resume quickly after the completion of works to minimise impacts to the public. Currently, subject to the damage of the pipes and on-site situations, the DSD mainly employs three trenchless technologies, namely cured-in-place-pipe (CIPP) lining, spirally-wound lining and slip-lining. CIPP lining technologyAccording to Mr CHEN Ka-yin, under the CIPP lining technology (that is commonly referred to as the “insertion into pig intestines” in Chinese), a soft polyester liner with a thickness of 10 to 40 millimetres is pulled into the host pipe through a “launch shaft”. The liner is then expanded and cured by steam or hot water until it hardens and forms a new pipe. This technology can be used on pipes under dry condition. In rehabilitating trunk sewers that still has water flow, we have to employ the spirally-wound lining technology instead. In this technique, a special winding machine is placed inside the pipeline to helically wind steel-reinforced polyethylene strips into circular shape to form a new pipe in the original pipe. Alternatively, the slip-lining method can also be used. As both methods are designed for the rehabilitation of running pipes, no interception is required. Slip-lining methodStanding at the construction site on Bailey Street in To Kwa Wan, Mr CHEN Ka-yin introduces the use of the slip-lining method at the site. First, a temporary shaft will be set up at an appropriate location. Part of the old pipeline will then be cut and exposed. After cleaning and inspection of the pipe, a 1.5-metre long fibreglass plastic liner will be pushed into the old or damaged pipe section by section. Then, with cement slurry filling the gap between the new and the old pipelines, a new pipe is formed. He points out that although a fibreglass plastic liner looks relatively thin, its structural strength is equal to that of a concrete pipe and its lifespan is up to 40 to 50 years. Planning for stage 2 worksAs the rehabilitation works of all stormwater drains and sewers in Hong Kong involves 18 districts, over the course of four months, colleagues of the DSD visited each of the districts to consult the relevant District Council committees and explain project details to stakeholders, so as to give an early start to the projects. Stage 1 works had begun and are scheduled for completion in 2022. Stage 2 works are scheduled to start in 2020 to conduct condition survey and rehabilitation of stormwater drains and sewers in six districts, including Tsuen Wan, Sham Shui Po and Yau Tsim Mong. (The video is broadcasted in Cantonese) (The video is provided by Development Bureau)

Father’s Day Series: Drain Chargeman Mr KOO Wai-ming of the Drainage Services Department

As Father’s Day is approaching, we would like to share with you a frontline worker and his little story as a father, so as to show our support for all good dads. Mr KOO Wai-ming has worked in the DSD for over three decades.  Starting out as a Workman II, he was promoted to Drain Chargeman 10 years ago.  He is not only a senior staff member in our department with total dedication, but also a guardian angel for his child. Currently, the DSD has 11 teams under the Direct Labour Force for clearing blocked drains, each with four to five Leading Sewermen or Workmen II led by a Drain Chargeman to discharge their duties.  More than clearing blocked drains Sharing his job experience, Mr KOO said that when an Amber/Red/Black rainstorm warning or a typhoon signal is hoisted, the DSD colleagues have to remain on standby on a rotational basis, 24 hours a day, at the Emergency Co-ordination Centre (ECC) to receive and handle public requests for assistance.  The frontline staff, once alerted by the ECC, will rush to the scene across the territory.  Upon arriving at the scene, the DSD workers will first use devices to test for any poisonous or explosive gas before opening manholes.  After that, they will desilt the blocked drains with rattan strips or high-pressure water jets. Handling emergency cases with a clear head Talking about his most memorable experience, Mr KOO recalled that he had once received an urgent request from a member of the public.  Arriving at the scene, he found the female caller emotionally unstable.  He did his best to comfort the lady, while at the same time he had to take prompt action with his colleagues to solve the blockage problem.  He later realised that the lady, being a new mother, had made incessant phone calls simply because she was worried that the foul water would affect her baby.  The incident tells him that there are always reasons behind the requests for assistance or complaints from the public or those in need, and therefore they should help them solve their problems as fast as possible with a positive attitude. A tough man’s tender love for his son Besides his work, our tough man Mr KOO also shared with us his family life.  When he talked about his family and his love for his son, his sentimental side shone through.  He has a 12-year-old son.  As he works shifts, he sometimes has to work on Saturdays and Sundays.  Whenever there is an emergency, he is required to go on duty at all hours and even has to work overnight.  At times, his son complains that he is often not at home.  As a father, he can only explain to his son with patience that his work is to serve the community and there is a public need for his service.  He hopes that his son will understand better as he grows up.  In the past, he read his son stories.  In the blink of an eye, his son will soon become a Secondary One student and the way they get along has changed a lot.  One thing is certain, however, he just cannot be too strict with his son and they need to communicate as friends to maintain their bonds. The name of Mr KOO’s son, KOO Chung-hang, carries a special meaning.  Mr KOO believes that all parents have expectations of their children.  He said the name he picked for his son comes from Confucius, whose second name is Zhongni (Chung-nei in Cantonese), with “Chung” meaning integrity.  Although he does not expect his son to have great achievements, he hopes his son will be a good, virtuous and righteous man.  Regarding his son’s future occupation, he said it will be up to his son. (The video is broadcasted in Cantonese) (The video is provided by Development Bureau)

Drainage Services Department's remote-controlled desilting robot

In Hong Kong, the rainy season generally starts in April. In order to further reduce flood risks during rainstorms, the Drainage Services Department (DSD) has introduced the “just-in-time clearance” arrangement this year. It has also adopted new technologies in using a new remote-controlled desilting robot for silt clearing works at box culverts to enhance the efficiency of desilting works. Preventing silt accumulation from affecting the drainage capacityHong Kong faces an average rainfall of about 2 400 millimetres a year, one of the highest among cities in the Pacific Rim. According to Mr POON Tin-yau, an engineer of the DSD, when stormwater is discharged into the sea through box culverts, the washed-off sand, stones and dust will accumulate gradually at the drains to form silt, which will in turn affect the drainage capacity and may lead to flooding in the most serious cases. To avoid the above situation, the department inspects the box culverts on a regular basis and arranges the desilting works if necessary to ensure that the drains are functioning properly. Operating as a vacuum cleanerEarly this year, a new remote-controlled desilting robot was introduced into the DSD. The DSD conducted a pilot test on the use of the robot for desilting works at the box culverts in Sham Shui Po and Tsuen Wan with its functions monitored. The robot will be lifted up with a crane and sent into the box culvert concerned through its opening. With the help of closed-circuit television and sonic survey, the operator can then observe the conditions inside the box culvert and remotely operate the robot for desilting from his workstation. Mr POON Tin-yau says that the robot, measuring approximately 3 metres in length, and 1.5 metres in both width and height, works similarly to a vacuum cleaner. Once the silt is sucked by the robot, it will be pumped to a temporary silt container on the ground through a tube connected to the robot. The silt will be transported to a landfill only after dewatering. Enhancing work safetyAccording to the traditional desilting method, workers need to go into the box culverts for installation and operation of desilting devices. Given that box culverts are confined spaces, workers working inside will face certain safety risks. The traditional method also requires interception of water flow in the culverts to allow workers to work in an environment without water flowing through, which means the work is limited mostly to dry seasons. On the contrary, the remote-controlled desilting robot can take over diving tasks to spare workers from going into confined and submerged space of the box culverts. Apart from enhancing work safety, the use of the robot allows desilting works in rainy seasons, which in turn will expedite the progress of such works, lower the costs and significantly improve the desilting efficiency. Implementation of the “just-in-time clearance” arrangementFurthermore, the DSD had analysed more than 200 flooding cases between 2017 and 2019, finding that more than 60 percent of them were due to blockage of drains by litter, fallen leaves or other washouts carried by surface runoff. This year, the department will implement the “just-in-time clearance” arrangement. Before the onset of a rainstorm, staff will be deployed to inspect about 200 drain locations in the territory which are susceptible to blockage by litter, fallen leaves or the like, and will immediately arrange for clearance if necessary. The department will also send staff to inspect and clear all major drainage intakes and river channels to prevent blockage after a rainstorm or when a typhoon signal is about to be lowered so as to prepare for the challenges of further rainstorms. Constructing more underground stormwater storage tanksApart from strengthening the responsive management measures before and after rainstorms, the DSD will continue to press ahead with its flood prevention strategy, which includes constructing more underground stormwater storage tanks to collect and temporarily store excessive rainwater during rainstorms, thus reducing the loading at downstream drains and the consequential flood risks. At present, six locations are under planning, including Shek Kip Mei Park, Tai Hang Tung Recreation Ground (extension), the Urban Council Centenary Garden in Tsim Sha Tsui, as well as Sau Nga Road Playground, Kwun Tong Ferry Pier Square and Hoi Bun Road Park in Kwun Tong District. (The video is broadcasted in Cantonese) (The video is provided by Development Bureau)

Drops · Livability (Drainage Services Department)

Happy Valley and its neighbourhood are low-lying areas flanked by hills. In the past, heavy rains triggered frequent flooding, which had a significant impact on the public. To protect people from the risk of floods, the Drainage Services Department (DSD) developed an innovative scheme to enhance flood protection in the district. The project team installed a stormwater storage tank underneath the Happy Valley Recreation Ground. During heavy rains, the tank temporarily stores excessive stormwater. Conventional drainage improvement schemes in urban areas are normally upgraded in-situ and in a large scale. In comparison, building a storage tank and storing flood water below ground greatly reduces disruptions to traffic flows and the general public. Movable weir The stormwater storage tank features a movable weir, which is a mechanism deployed by DSD for the first time. The weir’s opening, closing and overall positioning are automatically adjusted according to the real-time information on tidal levels as well as the water levels in the drainage culvert upstream and downstream. This mechanism allows stormwater overflow into the storage tank at the optimal time. Harvesting system collects groundwater and rainwater The tank’s design also incorporates a sizeable water harvesting system that collects groundwater and rainwater. After undergoing some simple treatment, the water can be used for irrigating the Happy Valley Recreation Ground and for toilet flushing, thereby conserving water resources. These features ensure that the project is sustainable and in line with the concept of “Sponge City”. Fan Room and Lawn A stormwater storage scheme requires the construction of support facilities above ground such as a fan room and a pump house. The project team customised the design to make optimal use of the site in the interest of the public. With an environment-friendly design, the ground floor of the fan room is opened up as a public amenity. The pump house is covered by a lawn, providing a comfortable outside area for fun and game watching. Going the extra mile, drop by drop, the project team consolidates stakeholders’ support and the fruit of joint efforts, bringing the project smoothly towards the goal of “Smart Drainage•Green Living”: flood protection and a more livable environment in tandem.     Partnering for innovationCHENG Nga-see - Senior Engineer, Drainage Services Department (For more details, please visit Sevice Excellence Website)