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RMS is creating systems and solutions that will be beneficial for generations to come
RMS is creating systems and solutions that will be beneficial for generations to come
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Siphonic Roof Drain


Rainwater Management Solutions is working with Jay R. Smith to offer you high-quality rainwater harvesting systems.


Siphonic roof drains, installed on flat roof buildings, looks like a traditional roof drain with the addition of an air baffle, which prevents air entering the piping system at peak flows.
In a siphonic drainage system, the roof drain baffle allows and sustains negative atmospheric pressure in the connected piping and inhibits the admission of air into the piping system, hence sustaining full-bore flow and higher flow volumes and velocities.

To learn more about the benefits of siphonic roof drains, download a brochure.


Siphonic Roof Drains and Rainwater Harvesting

  • Siphonic roof drains and rainwater harvesting systems work well together for a large commercial building. Siphonic drain systems ensure rooftop rainwater is diverted effectively and efficiently to a rainwater collection tank.
  • Siphonic drain systems drain to a single discharge point. A rainwater harvesting system installed at this discharge point will collect the rooftop runoff and supply water in and around the larger commercial building.
  • Siphonic drains systems utilize minimum materials as piping diameters are smaller than traditional drain systems. Utilizing less materials and recycling rainwater both address sustainable building design principles.
  • The materials cost savings associated with a siphonic drain system can offset the cost of a rainwater harvesting systems, which will pay for itself over the years




  • Learn more about siphonic roof drain systems through a webinar.

    Contact your local Jay R. Smith representative directly for all your roof drain and rainwater harvesting needs.

    To access and download the SiphoniTec® siphonic roof drain sizing software for free, visit Jay R. Smith's SiphoniTec® page