Siphonic System
Rainwater Drainage

Siphonic
System

What is Siphonics?

Physics put
to work for
architecture

In 1993, Fast Flow brought the siphonic system to Asia. The first siphonic project by Fast Flow was completed in Singapore. Since then, Fast Flow has completed numerous iconic projects around the Asia Pacific region.

Formation of siphonic action is a natural process that happens automatically in relation to rainfall — with no mechanical parts. When rainfall intensity reaches a high level, siphonic drainage system operates on the concept of full bore flow of incompressible fluid.

The fundamental of siphonic engineering is the Bernoulli Energy Equation. The natural hydraulic head due to the height of the building provides the energy necessary for the transportation of water from one point to another.

Siphonic System 3D Diagram
Advantages of Siphonics
◆
Space Saving
Leveraging small diameter pipework, Fast Flow solutions provide flexibility in pipe locations and free up crucial space of a building, easing tight space shared by all services.
◆
Elegance
Fast Flow siphonic solutions make use of minimal pipework and flexible use of materials, allowing freedom in creative design of drainage — preserving elegance even in harsh environments.
◆
No Gradient
All horizontal pipework in the system does not require a gradient. Siphonic systems maximise efficient use of multiple materials and achieve full lateral pipe lengths without slope.
◆
Design Freedom
By easing tight space shared by all services, Fast Flow siphonic systems bring forth flexible pipework configurations for complete design freedom across any structure.
◆
Multiple Materials
Fast Flow solutions maximise efficient use of multiple materials — UPVC, HDPE, cast iron, stainless steel — enabling a single siphonic system across any structure.
◆
Rainwater Harvesting
Fast Flow siphonic systems allow various outlets to combine into a single system and transport water through long distances without slope — ideal for rainwater harvesting.
◆
Rainwater Management
Exhibits flexibility in managing rainwater design for all types of roofs and buildings through creative design and engineering.
◆
Landscape Drainage
Enhances efficiency and aesthetic of the network drainage connection, creating elegant landscape and effective green roof drainage solutions.
Complete Total Solution

The right outlet
for every
application

Fast Flow offers a complete range of siphonic roof drainage outlets, each precision-engineered for specific scenarios and applications — from flat membrane roofs and green roofs to structural metal decks and parapet walls.

Whether the challenge demands concealed drainage, high-flow capacity, or seamless integration with waterproofing systems, there is a Fast Flow outlet designed to perform. Our range covers every drainage load and installation condition encountered across Asia Pacific's diverse building typologies.

Fast Flow Complete Siphonic Outlet Range
Explore the
siphonic advantage
for your project
Contact Our Engineers →