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Openchannelflow fiberglass Diversion Manholes help operators control, direct, and distribute below grade non-full pipe flows.

Openchannelflow - fiberglass manhole sloganDiversion Manholes are available multiple configurations including:

  • Interior drops
  • Y-channels
  • J-bends

Diversion Manholes allow for drop-in-place installation and can be provided with gated channels to direct flow to different downstream locations.

Like our other fiberglass manholes, Openchannelflow Diversion Manholes are single-piece, watertight, and corrosion resistant.  

When Y-channels or J-bends are provided, fiberglass benching is included around them.  The benching eliminates the need to pour concrete benching in the manhole and has a molded-in non-slip diamond plate pattern.  The diamond plate doesn't wear or blind like gritted surfaces and is easy to maintain.


A variety of top styles are available with Openchannelflow Diversion Manholes, including:

Openchannelflow Diversion Manholes are available in sizes from 48 to 96-inches [1.22 to 2.44 m] in diameter and in depths up to 35-feet [10.7 m].  

As the size / complexity of the diversion system increases, larger diameter Diversion Manholes are necessary.

More About Diversion Manholes

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