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Drainage for
landmark
residential towers

High-rise residential developments present unique drainage challenges — exposed balconies, large podium areas, green roof terraces and the unacceptable risk of water ingress into habitable spaces. Fast Flow's psBalcony™ pressurised system and siphonic solutions have been specified at iconic residential developments across Asia Pacific, including The Interlace and Reflections Keppel Bay in Singapore, Southbank Melbourne, and major residential towers in Malaysia, China and Indonesia.

Featured Project · Singapore

The
Interlace

1,040
Residential units
31
Six-storey apartment blocks
psBalcony®
Patented system deployed
The Interlace, Singapore
The Interlace · Singapore · 31 interlocking six-storey blocks · 1,040 residential units
Challenges
  • The interlocking block configuration eliminates conventional vertical continuity, preventing rainwater drainage stacks from running directly from the roof to the ground.
  • Rainwater downpipes from each six-storey block must be consolidated and routed horizontally through extremely congested M&E transfer spaces before reaching the shared service cores located at the block interlocking points.
  • This presents a particularly critical challenge for balcony drainage. Long horizontal collector pipes without gradient can generate transient pressure fluctuations, creating a significant risk of water backflow into connected balconies during heavy rainfall.
Solutions
  • Fast Flow's siphonic drainage system enables large-capacity horizontal rainwater transfer without pipe gradients, allowing roof drainage from each block to be efficiently conveyed through the constrained M&E transfer spaces to the central service cores.
  • Fast Flow's patented psBalcony® pressurised balcony drainage system was developed specifically for this application. By incorporating the patented psVent® anti-backflow technology, the system safely conveys balcony discharge through horizontal collector pipes without slope while preventing transient pressure from causing backflow into balcony outlets.
Achievements
  • Successfully integrated both the siphonic roof drainage system and the psBalcony® pressurised drainage system within highly congested M&E transfer spaces, maximising usable building space while maintaining exceptional drainage performance.
  • Eliminated the risk of balcony backflow through the application of Fast Flow's patented psVent® anti-backflow technology, ensuring reliable operation even under peak storm conditions.
  • Delivered a highly customised drainage solution that overcame one of the most complex drainage challenges created by the building's iconic interlocking architecture, while fully preserving the architect's design vision.
The Interlace — drainage detail The Interlace — block configuration The Interlace — M&E transfer
Project References
Reflections at Keppel Bay
Reflections at Keppel Bay
Singapore
The Interlace
The Interlace
Singapore
Pinnacle @ Duxton
Pinnacle @ Duxton
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Australia
Residential Project
Australia
Residential Project — Australia
Residential Project
Australia
Residential Project — Australia
Residential Project
Australia
Residential Project — Australia
Residential Project
Australia
Residential Project — Australia
Residential Project
Australia
Reflections at Keppel Bay
Reflections at Keppel Bay
Singapore
The Interlace
The Interlace
Singapore
Pinnacle @ Duxton
Pinnacle @ Duxton
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Singapore
Residential Project
Singapore
Residential Project — Australia
Residential Project
Australia
Residential Project — Australia
Residential Project
Australia
Residential Project — Australia
Residential Project
Australia
Residential Project — Australia
Residential Project
Australia
Residential Project — Australia
Residential Project
Australia
Key Challenges
Challenge 01
Balcony Flooding
Exposed high-rise balconies are subject to extreme rainfall intensities — particularly in tropical climates. Conventional drainage cannot always drain water fast enough to prevent flooding and potential ingress into the unit. The psBalcony™ system is specifically designed to address this challenge.
Challenge 02
Podium Deck Drainage
Large podium decks in mixed residential developments require drainage systems that can handle high flow rates while minimising structural penetrations through the podium slab and maintaining a waterproof deck surface.
Challenge 03
Landscape Integration
Green roofs and landscape terraces require drainage systems that are invisible, low-maintenance and compatible with planted substrates — while still performing at peak capacity during extreme rainfall events.
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