Siphonic systems are engineered on the concept of full bore flow (a fill rate of 100%) of uncompressible fluid. That is rainwater is transferred at high velocity through pipe networks that are small, flexible, and generally of zero gradient by harnessing the energy derived from the hydraulic head which is created due to natural difference in elevations of roof outlet and the discharge points in a building.

The engineering principle of siphonic roof drainage design is based on the Bernoulli energy equation.

Analysis of pipe networks takes into consideration the available hydraulic head and head losses due the different pipe materials and pipe configurations used in the system. Iterative calculations are done to ensure a properly balanced system free from cavitations and where the pressures and flow velocities are controlled to ensure the proper function of siphonic.

Siphonic roof drainage system is a revolutionary technology that occurs in the field of roof drainage design which has not seen many innovations for hundreds of years. Its flexibility gives architects and engineers unparalleled freedom in achieving innovative solutions for rainwater problems for buildings. Its accuracy allows for major innovation in creative usage of our natural rainwater resources in rainwater harvesting, and in flood control and its efficiency gives building owners better risk management at a higher economic value.