For contractors, fiberglass Flume Manholes provide:

• Single source responsibility (no finger-pointing between subcontractors)
• Confidence that the flume is installed correctly and with the necessary transitions to ensure accurate flow measurement (happy customers)
• Virtually no warranty repairs when installed according to Openchannelflow’s instructions. Dig a hole, drop it in, and you are done.
• Industry-leading FiberLock equipment warranty – up to 5 years!
• Minimal installation downtime (minimizing pump around on active lines – better utilization of site equipment)

For consultants, fiberglass Flume Manholes provide:

• Single source responsibility (no finger-pointing between subcontractors)
• The ability to integrate a much wider selection of flumes than can readily be accommodated in concrete structures (integrate the flume the best fits the flow)
• Confidence that the flume is installed correctly and with the necessary transitions to ensure accurate flow measurement (happy customers)
• Industry-leading FiberLock equipment warranty – up to 5 years!
• High levels of user satisfaction – users who have experience with fiberglass flow metering manholes almost exclusively specify their use on future projects – they are just that happy!

Flumes available for integration:

• Parshall 
  • 1 to 36-inches
• Palmer Bowlus 
  • 4 to 36-inches
• Trapezoidal 
  • Small to 2-inch 45º SRCRC
• H Flume 
  • 0.4-foot HS to 2.5-foot H
• Montana 
  • 1 to 6-inches
• Cutthroat 
  • 18-inch to 108-inch L

At the core of each Openchannelflow Packaged Metering Manhole is our fiberglass manhole tube.  While manhole configurations may differ, all Openchannelflow manhole tubes meet or exceed both ASTM D3753 and AASHTO H-20 standards.  The interior of these tubes is smooth and corrosion-resistant.  The light tan coloration of the tube helps to maximize visibility inside the manhole.

To the barrel, we add a cover, base, mounting flange, and, most importantly, a flume sized to measure the flow accurately!

Flume Metering Manholes provide:

• Single source responsibility
• Confidence the flume in installed correctly
• Properly formed inlet / outlet transitions
• An ability to integrate a wide range of flume styles and sizes
• Virtually no maintenance
• Minimal downtime (perfect for installation during plant shutdowns)
• A safe environment in which an operator can measure and sample flow

Unlike competing Flume Metering Manholes, which claim to meet ASTM D3753, the interior of Openchannelflow Packaged Metering Manholes are pigment / gel coat free – allowing for visual inspection and quality control of the tube during and after production and meeting D3753.

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

• Domed Fiberglass (for non-vehicle / traffic areas)
• Aluminum Covers (for pedestrian traffic areas)
• H-20 Traffic Reducers (for use with standard grade rings, frames, and covers)
• Open Top (for custom applications where the manhole top needs to be open or provided with a fiberglass grating)

Openchannelflow Flume Metering Manholes are available in diameters from 48 to 96-inches [1.22 to 2.44 m] and depths up to 35-feet [10.7 m].

Flume metering manhole components

• Cover
• OSHA-complaint fiberglass ladder
• Thru-wall coupling
• Integral base / mounting flange
• Flume
• Inlet / outlet piping

Many of the accessories Openchannelflow has developed for our flumes and Packaged Metering Manholes can be integrated into our Flume Meter Manholes:

• Integral flow benches
• Grating platforms
• Ventilation
• Equipment mounting
• Two-piece construction (for oversized manholes)
• Level / flow measurement mounts
• Parameter mounts
• Nested (dual range) flumes

As with any flume application, the flow must be sub-critical and non-full pipe.