We provide first hand insight into Hong Kong's integrated flood management strategy, including visits to various technical facilities that showcase the most effective solutions for protecting the public from flooding during extreme weather events.

Tour 1

Theme: River Revitalisation  
Kai Tak River 


The Kai Tak River, formerly known as Kai Tak Nullah, is the first revitalized river in Hong Kong's densely populated urban area and serves as a major drainage channel in East Kowloon. Due to urbanization and extreme weather events, the drainage capacity of Kai Tak Nullah was insufficient to meet necessary flood protection standards. This inadequacy led to serious flooding along Choi Hung Road, impacting the Wong Tai Sin and San Po Kong areas during rainstorms in the past.

To address these challenges, the DSD took the opportunity to upgrade the drainage systems by constructing a box culvert alongside the nullah. In conjunction with this project, the DSD revitalized the Kai Tak Nullah, transforming it into a vibrant urban green river corridor now known as the Kai Tak River. This initiative not only enhances flood protection but also enriches the urban landscape.

Drainage upgrading works in the areas and river revitalised works were completed in 2018 and flood risk has been greatly reduced since its operation.

Jordan Valley nullah mainly conveys the rainwater collected from the catchment areas in the vicinity of Fei Ngo Shan and Ngau Tau Kok for eventual discharge into the Victoria Harbour.  Upon completion of the revitalisation works for the Jordan Valley nullah by converting it into the Jordan Valley channel, it embodies various design elements of "Rivers in the City", including enhancing biodiversity and greening the existing concrete channel, and also blends in with the community by providing a public open space and promoting a water-friendly culture through connectivity with the bank of the channel.  Members of the public can now admire the view of the landscaped channel in the additional open space provided at the “River Garden” built over the Jordan Valley.

Tour 2

Theme: Smart Drainage
Happy Valley Underground Stormwater Storage Scheme

The Happy Valley Underground Stormater Storage Scheme (HVUSSS) is an important flood prevention project in Hong Kong.  HVUSSS innovatively enhances the flood protection level of the city and successfully resolves the flooding problems in Happy Valley and Wan Chai districts.  The HVUSSS comprises a 60,000 cubic metres (which is equivalent to the total volume of 24 standard swimming pools) underground stormwater storage tank underneath the Happy Valley Recreation Ground, a box culvert of about 650 metres long and a stormwater pump house with a peak flow rate of 1.5 cubic metres per second.  The adoption of smart and automatic movable weirs, water harvesting system and green building designs has created a resilient and adaptable drainage system that blends harmoniously with the environment.

Tour 3

Theme: Stormwater Management
Yuen Long Barrage and Nullah Improvement Schemes

Yuen Long Barrage include the construction of an automatic flood barrier, a stormwater pumping station with a pumping capacity of 300 cubic meters per second, a master control centre and the associated electrical and mechanical facilities in the Yuen Long Nullah.  Other than providing the flood protect facility, the DSD also takes the opportunity to revitalise a section of about 1 km of the Yuen Long Nullah between the Long Ping Station and the location of the proposed barrage.

Yuen Long Bypass Floodway is to mitigate flooding in Yuen Long Town and its adjacent village areas.  It is a manmade engineered drainage channel built at the south of Yuen Long Town applying the flood prevention strategy of interception.  Upon its completion, 40% of the runoff during extreme rainstorm in the Yuen Long catchment will be intercepted by the bypass floodway and directly discharged to the downstream Kam Tin River.  The Bypass Floodway has incorporated a series of environmental designs, such as construction of a 7-hectares engineered wetland.  Sustainable ecological habitat with great biodiversity within the engineered wetland with over 130 plant species and various species of birds, frogs, insects and bats.