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[Overview of Flood Prevention] [Overview of Sewage Treatment]
“Summer always brings rain. To carry away rainwater, we must keep our drains clear…” Both sewage treatment and rainwater drainage are closely tied to the daily lives of citizens. While endeavouring to provide world-class sewage and rainwater drainage services, we boost our resilience to increasing extreme weather. It is our goal to create a more livable environment for the public.
Affected by extreme weather, Hong Kong faced frequent severe rainstorms that posed challenges to flood prevention in 2016. The annual total rainfall of that year was 3,027 millimetres, about 26% higher than the mean annual total rainfall of approximately 2,400 millimetres between 1981 and 2010. During the year, the Hong Kong Observatory issued one Black, five Red and 21 Amber Rainstorm Warnings. The Black Rainstorm Warning on 19 October 2016 was the first Black Rainstorm Warning ever issued in October since the inception of the Rainstorm Warning System in 1992. Over 100 millimetres of rainfall were recorded in most areas in Hong Kong that afternoon. The rainfall of 78.7 millimetres recorded between 3 and 4 p.m. on that day was also the highest hourly rainfall in October since records began in 1884.
To prevent flooding and safeguard the public, we have designed and constructed stormwater drainage systems with reference to international standards, and carried out regular inspections and maintenance works. In 2016-17, DSD implemented various flood prevention projects to upgrade the flood protection level and reduce the flood risks in relevant hazard areas. While ensuring that our facilities are operated properly, we are reviewing the Drainage Master Plans (DMPs) of various districts in stages, so as to formulate corresponding strategies for Hong Kong’s future development.
In early 2017, after evaluating the effectiveness of each completed drainage improvement works, we removed the flooding blackspot at the junction of Wong Chuk Hang Road and Nam Long Shan Road, thus reducing the total number of flooding blackspots in the territory from eight to seven.
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Among the seven remaining flooding blackspots, drainage improvement works for three have been commissioned. We are monitoring the effectiveness of these works as well as planning and designing improvement works for the remaining four. We will closely monitor their respective drainage conditions during the rainy season and endeavour to eliminate all flooding blackspots as soon as possible.
DSD manages about 2,400 kilometres of underground stormwater drains, 360 kilometres of engineered channels, 21 kilometres of drainage tunnels, and 36 stormwater pumping stations. In 2016-17, we continued with our regular inspections and preventive maintenance works of all stormwater drainage facilities to ensure smooth operation of the drainage systems. We also conduct functional and structural checks regularly and clear blockages before the wet season and after heavy rainstorms. Over 2,200 kilometres of drains and rivers were inspected over the past year.
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DSD has completed eight DMP studies and three drainage studies covering all flood-prone areas in Hong Kong. To tie in with Hong Kong's future development and adapt to climate change, we review and update DMPs in a timely manner to assess the effectiveness of completed drainage improvement works. Where necessary, further improvement measures will be recommended.
The review studies of DMPs for Yuen Long district, Northern New Territories and Happy Valley were completed in 2011 whereas, the improvement works proposed in the studies are under construction or design. The DMP Reviews for West Kowloon and East Kowloon were also completed in 2015. We are currently reviewing the DMPs for Lantau and Outlying Islands, Shatin and Sai Kung, Tai Po and Northern Hong Kong Island. Planning for the remaining review studies is underway.
This project aims to improve the flood protection level for the river section between the Ping Yuen River estuary and Liantang/Heung Yuen Wai Boundary Control Point by improving a 4.5-kilometre section of the Shenzhen River (between Ping Yuen River and Pak Fu Shan), and constructing a flood retention lake of 80,000 cubic metres. We hope to create wetland habitats in the lake to enhance the ecological environment.
The Shenzhen River Regulation Project Stage IV is scheduled for completion in July 2017 at an estimated construction cost of approximately $1 billion.
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Aerial view of Shenzhen River Regulation Project Stage IV flood retention lake (Construction of retention lake in progress)
The project aims to improve flood protection levels of East Kowloon by reconstructing and rehabilitating a 1.1-kilometre section of the Kai Tak River from Po Kong Village Road to Prince Edward Road East. A box culvert of about 400 metres long will also be constructed alongside the river upstream. We hope to ride on the opportunity to upgrade the river’s drainage capacity and revitalise into an urban green river corridor for public enjoyment.
Upstream and midstream improvement works of the Kai Tak River commenced in October 2011 and December 2013 respectively and are scheduled for completion in 2018. The estimated project cost is about $2.8 billion.
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Kai Tak River improvement works in progress
We are conducting revitalisation works in Kowloon East, transforming a 1-kilometre nullah along King Yip Street, King Yip Lane and Tsui Ping Road into Tsui Ping River through environmental, ecological and scenic enhancement. The project also beautifies adjoining pavements as well as improves connectivity and walkability by providing riverside walkways and landscaped decks.
Investigation study began in July 2015 and is scheduled for completion in 2017. The phase one public engagement exercise was completed in March 2017.
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Photomontage of Tsui Ping River
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