Training is based on learning to design for full compliance with British Standard BS 8490 Siphonic Drainage Standard or ASPE/ANSI 45 Plumbing and Engineering Standard for Siphonic Roof Drainage which is the reference standard within both International Plumbing Code (IPC) and Uniform Plumbing Code (UPC).

There are three parts to learning how to properly design Siphonic Roof Drainage.

Firstly we cover the basics of roof drainage design including roof area calculations, applicable design rainfall rates, and the following Introduction to siphonic drainage:-

  • History of Siphonic Drainage
  • Understanding the Hydraulic principles of Gravity Drainage
  • Understanding the Hydraulic principles of Siphonic Drainage
  • Introduction to published standards (tailored to your particular market)
  • Explanation to the how a siphonic drainage system works
  • Hydraulic Parameters to be met within the HydroTechnic analytical design program
    (to comply with local standards)
  • Piping Details – Do’s and Don’ts
  • System Termination and Venting Requirements 

Secondly there is the understanding of hydraulic requirements and parameters to be met within the referenced standards and codes. 

  • Hydraulic Calculations (Bernoulli, Darcy-Weisbach, Colebrook-White)
  • Positive Pressure
  • Negative Pressure
  • Minimum Velocity (outside of main downpipe)
  • Minimum Velocity (main downpipe)
  • System Fill (prime) Time
  • Roofs from different ElevationsRoofs with different surface types

Lastly, the training on design calculation software HydroTechnic web-based program and/or our advanced Hydrotechnic Revit API plug-in.


Advanced and extremely accurate analytical design calculation program

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