Airports
Works

Airport
Projects

Drainage for
landmark
terminals

Airport terminals present some of the most demanding drainage engineering challenges — vast roof areas, complex structural systems, strict regulatory requirements and zero tolerance for drainage failure. Fast Flow has completed siphonic drainage systems for major airports across Asia Pacific and beyond, from Singapore's Changi to Beijing Capital, Guangzhou Baiyun, and airports throughout Southeast Asia and Australia.

Featured Project · Beijing, China

Beijing Capital
International Airport

2-Tier
20yr primary · 100yr secondary
Hydraulic
Jump
Special containment design
Arch.
Seamless integration into architecture
Beijing Capital International Airport — organic 3D curved roof structure
Beijing Capital International Airport · Organic 3D curved roof structure · Multiple north-south gutter segments
Challenges
  • Beijing Capital Airport's organic 3D curved roof is divided by multiple north-south gutters into segments. These gutters, positioned above the space frame structure, are limited to just 250mm depth with slopes varying both along and across the gutter — creating extreme hydraulic complexity.
  • The roof required a 2-tier drainage design: primary drainage sized for a 20-year return period, with controlled overflow to a lower gutter for 100-year events. Managing two concurrent flow regimes within a single shallow gutter system presented a formidable design challenge.
  • High-velocity gutter flow, bi-directional slopes, hydraulic jump formation at flat drainage sumps, and strict containment of overflow — all had to be solved simultaneously within the 250mm gutter depth constraint.
Solutions
  • Through meticulous 3D analysis of water flow at every gutter location, Fast Flow designed off-centred sumps that exploit the roof profile to create a controlled drop, breaking flow momentum before it reaches the siphonic outlet.
  • The extent of hydraulic jumps was calculated precisely at each location, and bespoke cover plates were designed to contain the jumps within the gutter depth — preventing overflow at the primary drainage stage.
  • Additional strategically placed cover plates manage the controlled overflow, channelling excess water safely to the lower tier. All these specialised features work in concert within the 250mm gutter envelope.
Achievement
  • The Beijing Capital Airport siphonic drainage design stands as a benchmark of specialised hydraulic engineering: combining high-efficiency siphonic systems with precision 3D water flow analysis and creative open-channel solutions. It exemplifies Fast Flow's ability to develop entirely customised solutions tailored to problems that are unique to each project — solving what others cannot.
2-tier drainage design
2-tier drainage design
Design to contain hydraulic jump while allowing overflow
Contain hydraulic jump while allowing overflow
Special collector and containment sump
Special collector and containment sump
3D design integration with building structure
3D design integration with building structure
Construction detailing analysis
Construction detailing analysis
Water flow analysis into containment sump
Water flow analysis into containment sump
Project References
Ahmedabad International Airport Phase 1
Ahmedabad International Airport Phase 1
India
Bandaranaike International Airport
Bandaranaike International Airport
Sri Lanka
Beijing Capital Airport T3B
Beijing Capital Airport T3B
China
Benazir Bhutto International Airport
Benazir Bhutto International Airport
Pakistan
Bintulu Airport
Bintulu Airport
Malaysia
Blimbingsari Airport
Blimbingsari Airport
Indonesia
Brisbane Airport Domestic Arrival
Brisbane Airport Domestic Arrival
Australia
Brunei International Airport
Brunei International Airport
Brunei Darussalam
Changi Airport T2
Changi Airport T2
Singapore
Changi Airport T3
Changi Airport T3
Singapore
Changi Airport T4
Changi Airport T4
Singapore
Changzhou Benniu Airport
Changzhou Benniu Airport
China
Chengdu Shuangliu International Airport T2
Chengdu Shuangliu International Airport T2
China
Chongqing Jiangbei Airport 1
Chongqing Jiangbei Airport 1
China
Chongqing Jiangbei Airport 2
Chongqing Jiangbei Airport 2
China
Chongqing Jiangbei International Airport T3
Chongqing Jiangbei International Airport T3
China
Guangzhou Bai Yun Airport
Guangzhou Bai Yun Airport
China
Hainan Sanya Fenghuang Airport
Hainan Sanya Fenghuang Airport
China
Hangzhou Xiaoshan Airport
Hangzhou Xiaoshan Airport
China
Hanoi International Airport
Hanoi International Airport
Vietnam
Hazrat Shahjalal International Airport
Hazrat Shahjalal International Airport
Bangladesh
Hefei Xinqiao Airport
Hefei Xinqiao Airport
China
HKIA Midfield Concourse P533
HKIA Midfield Concourse P533
China
Hong Kong International Airport Contract 3508 T2 Expansion
Hong Kong International Airport Contract 3508 T2 Expansion
China
Huang Shan Airport
Huang Shan Airport
China
Jinggangshan Airport
Jinggangshan Airport
China
Kertajati Airport
Kertajati Airport
Indonesia
Khon Kaen Airport
Khon Kaen Airport
Thailand
KLIA2
KLIA2
Malaysia
Komodo Labuan Bajo
Komodo Labuan Bajo
Indonesia
Kota Kinabalu International Airport T2
Kota Kinabalu International Airport T2
Malaysia
Krabi Airport
Krabi Airport
Thailand
Kualanamu International Airport
Kualanamu International Airport
Indonesia
Kuching Airport
Kuching Airport
Malaysia
Labuan Airport
Labuan Airport
Malaysia
Lhasa Gonggar International Airport
Lhasa Gonggar International Airport
China
Liuting Airport
Liuting Airport
China
Lombok International Airport
Lombok International Airport
Indonesia
Low Cost Carrier Terminal (LCCT)
Low Cost Carrier Terminal (LCCT)
Malaysia
Miri Airport
Miri Airport
Malaysia
Mozes Kilangin International Airport
Mozes Kilangin International Airport
Indonesia
Mutiara Airport
Mutiara Airport
Indonesia
Mutiara SIS Al Jufri Airport
Mutiara SIS Al Jufri Airport
Indonesia
Nanning Wuxu International Airport
Nanning Wuxu International Airport
China
New Delhi Airport
New Delhi Airport
India
New Yogyakarta International Airport
New Yogyakarta International Airport
Indonesia
Ngurah Rai International Airport
Ngurah Rai International Airport
Indonesia
Ning Bo Airport
Ning Bo Airport
China
Ningxia Yinchuan Hedong
Ningxia Yinchuan Hedong
China
Oecusse Airport
Oecusse Airport
East Timor
Ranai Airport
Ranai Airport
Indonesia
Sam Ratulangi International Airport
Sam Ratulangi International Airport
Indonesia
Samarinda Baru Airport
Samarinda Baru Airport
Indonesia
Sandakan Airport
Sandakan Airport
Malaysia
Senai Airport Cargo Building
Senai Airport Cargo Building
Malaysia
Shanghai Pudong Airport
Shanghai Pudong Airport
China
Shanghai Pudong International Airport T1
Shanghai Pudong International Airport T1
China
Sibu Airport
Sibu Airport
Malaysia
Soekarno Hatta International Airport T3
Soekarno Hatta International Airport T3
Indonesia
Sultan Hasanuddin Airport
Sultan Hasanuddin Airport
Indonesia
Sultan Hasanuddin International Airport Expansion
Sultan Hasanuddin International Airport Expansion
Indonesia
Supadio International Airport
Supadio International Airport
Indonesia
Syamsudin Noor Airport
Syamsudin Noor Airport
Indonesia
Sydney Airport T1
Sydney Airport T1
Australia
Tjilik Riwut Airport
Tjilik Riwut Airport
Indonesia
Trunojoyo Airport
Trunojoyo Airport
Indonesia
Upgrading Of Changi Airport T1
Upgrading Of Changi Airport T1
Singapore
Urumqi Airport
Urumqi Airport
China
Wuxi Shuofang Airport
Wuxi Shuofang Airport
China
Xiamen Airport T4
Xiamen Airport T4
China
Xichang Qingshan Airport
Xichang Qingshan Airport
China
Yangzhou Taizhou Airport Formerly Suzhong Jiangdu Airport
Yangzhou Taizhou Airport Formerly Suzhong Jiangdu Airport
China
Yantai Chaoshui Airport
Yantai Chaoshui Airport
China
Ahmedabad International Airport Phase 1
Ahmedabad International Airport Phase 1
India
Bandaranaike International Airport
Bandaranaike International Airport
Sri Lanka
Beijing Capital Airport T3B
Beijing Capital Airport T3B
China
Benazir Bhutto International Airport
Benazir Bhutto International Airport
Pakistan
Bintulu Airport
Bintulu Airport
Malaysia
Blimbingsari Airport
Blimbingsari Airport
Indonesia
Brisbane Airport Domestic Arrival
Brisbane Airport Domestic Arrival
Australia
Brunei International Airport
Brunei International Airport
Brunei Darussalam
Changi Airport T2
Changi Airport T2
Singapore
Changi Airport T3
Changi Airport T3
Singapore
Changi Airport T4
Changi Airport T4
Singapore
Changzhou Benniu Airport
Changzhou Benniu Airport
China
Chengdu Shuangliu International Airport T2
Chengdu Shuangliu International Airport T2
China
Chongqing Jiangbei Airport 1
Chongqing Jiangbei Airport 1
China
Chongqing Jiangbei Airport 2
Chongqing Jiangbei Airport 2
China
Chongqing Jiangbei International Airport T3
Chongqing Jiangbei International Airport T3
China
Guangzhou Bai Yun Airport
Guangzhou Bai Yun Airport
China
Hainan Sanya Fenghuang Airport
Hainan Sanya Fenghuang Airport
China
Hangzhou Xiaoshan Airport
Hangzhou Xiaoshan Airport
China
Hanoi International Airport
Hanoi International Airport
Vietnam
Hazrat Shahjalal International Airport
Hazrat Shahjalal International Airport
Bangladesh
Hefei Xinqiao Airport
Hefei Xinqiao Airport
China
HKIA Midfield Concourse P533
HKIA Midfield Concourse P533
China
Hong Kong International Airport Contract 3508 T2 Expansion
Hong Kong International Airport Contract 3508 T2 Expansion
China
Huang Shan Airport
Huang Shan Airport
China
Jinggangshan Airport
Jinggangshan Airport
China
Kertajati Airport
Kertajati Airport
Indonesia
Khon Kaen Airport
Khon Kaen Airport
Thailand
KLIA2
KLIA2
Malaysia
Komodo Labuan Bajo
Komodo Labuan Bajo
Indonesia
Kota Kinabalu International Airport T2
Kota Kinabalu International Airport T2
Malaysia
Krabi Airport
Krabi Airport
Thailand
Kualanamu International Airport
Kualanamu International Airport
Indonesia
Kuching Airport
Kuching Airport
Malaysia
Labuan Airport
Labuan Airport
Malaysia
Lhasa Gonggar International Airport
Lhasa Gonggar International Airport
China
Liuting Airport
Liuting Airport
China
Lombok International Airport
Lombok International Airport
Indonesia
Low Cost Carrier Terminal (LCCT)
Low Cost Carrier Terminal (LCCT)
Malaysia
Miri Airport
Miri Airport
Malaysia
Mozes Kilangin International Airport
Mozes Kilangin International Airport
Indonesia
Mutiara Airport
Mutiara Airport
Indonesia
Mutiara SIS Al Jufri Airport
Mutiara SIS Al Jufri Airport
Indonesia
Nanning Wuxu International Airport
Nanning Wuxu International Airport
China
New Delhi Airport
New Delhi Airport
India
New Yogyakarta International Airport
New Yogyakarta International Airport
Indonesia
Ngurah Rai International Airport
Ngurah Rai International Airport
Indonesia
Ning Bo Airport
Ning Bo Airport
China
Ningxia Yinchuan Hedong
Ningxia Yinchuan Hedong
China
Oecusse Airport
Oecusse Airport
East Timor
Ranai Airport
Ranai Airport
Indonesia
Sam Ratulangi International Airport
Sam Ratulangi International Airport
Indonesia
Samarinda Baru Airport
Samarinda Baru Airport
Indonesia
Sandakan Airport
Sandakan Airport
Malaysia
Senai Airport Cargo Building
Senai Airport Cargo Building
Malaysia
Shanghai Pudong Airport
Shanghai Pudong Airport
China
Shanghai Pudong International Airport T1
Shanghai Pudong International Airport T1
China
Sibu Airport
Sibu Airport
Malaysia
Soekarno Hatta International Airport T3
Soekarno Hatta International Airport T3
Indonesia
Sultan Hasanuddin Airport
Sultan Hasanuddin Airport
Indonesia
Sultan Hasanuddin International Airport Expansion
Sultan Hasanuddin International Airport Expansion
Indonesia
Supadio International Airport
Supadio International Airport
Indonesia
Syamsudin Noor Airport
Syamsudin Noor Airport
Indonesia
Sydney Airport T1
Sydney Airport T1
Australia
Tjilik Riwut Airport
Tjilik Riwut Airport
Indonesia
Trunojoyo Airport
Trunojoyo Airport
Indonesia
Upgrading Of Changi Airport T1
Upgrading Of Changi Airport T1
Singapore
Urumqi Airport
Urumqi Airport
China
Wuxi Shuofang Airport
Wuxi Shuofang Airport
China
Xiamen Airport T4
Xiamen Airport T4
China
Xichang Qingshan Airport
Xichang Qingshan Airport
China
Yangzhou Taizhou Airport Formerly Suzhong Jiangdu Airport
Yangzhou Taizhou Airport Formerly Suzhong Jiangdu Airport
China
Yantai Chaoshui Airport
Yantai Chaoshui Airport
China
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