Weir Manholes
While the range of flumes offered by Openchanneflow is extensive, there are times when a weir is a better fit for a buried pipe flow application. Until now the question was how best accurately install a weir in a below grade application. Openchanneflow has introduced a line of packaged fiberglass Weir Manholes to solve this problem.
Openchannelflow’s Weir Manholes integrate the same v-notch weir plates used in our portable weir and weir box applications with fiberglass manhole barrels to provide a single-piece, factory-integrated, packaged, watertight, and corrosion resistant solution that requires requiring minimal installation time and virtually no maintenance. Dig It! Drop It! Done!
For owners fiberglass Weir Manholes provide:
- Confidence that the weir is sized, fabricated, and installed correctly to ensure accurate flow measurement (no questions from your monitoring agencies)
- Single source responsibility (no finger pointing between subcontractors)
- Low maintenance and repair costs due to the corrosion resistance of fiberglass to even the most aggressive of environments
- Minimal installation downtime
For contractors fiberglass Weir Manholes provide:
- Single source responsibility (no finger pointing between subcontractors)
- Confidence that the weir is sized, fabricated, and installed correctly to ensure accurate flow measurement (happy customers)
- Virtually no warranty repairs when installed according to Openchannelflow.com’s instructions. Dig a hole, drop it in, and your 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 Weir Manholes provide:
- Single source responsibility (no finger pointing between subcontractors)
- Confidence that the weir is sized, fabricated, and installed correctly to ensure accurate flow measurement (happy customers)
- Industry leading equipment warranty – up to 5 years!
- High levels of user satisfaction – users who have experience with fiberglass flow measurement manholes (flume or weir) almost exclusively specify their use on future projects – they are just that happy!
Openchannelflow.com offers a variety of manhole cover styles, diameters, and options to tailor our Weir Manholes to your specific needs.
Top styles include:
- Full opening domed top for maximum access
- Flat cover aluminum hatches for pedestrian areas / low profile installations
- Large diameter opening highway loading reducers tops (using customer supplied grade rings, cover, and frame)
5’ [152 cm], 6’ [183 cm], 7’-8” [234 cm]1
The 4’ [122 cm] manhole diameter available with our flume based flow measurement manholes, although available upon request, is typically too small to allow the formation of a correct weir pool for any but the smallest of flows. As such it is not typically used in Weir Manhole applications.
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Weir carrier with one (1) standard weir plate mounted
- Weir plates available include: 22-1/2° V , 30° V, 60° V, 90° V, 120° V, and 12” Cipolletti
- Corrosion resistant interior barrel surface
- OHSA-compliant fiberglass ladder with non-slip ladder rungs
- Integrated cover (see above)
- Closed base
- External base mounting / anti-flotation flange with cushioning pad
- Inlet / outlet piping with flexible couplings for quick pipeline connection (flanges and caulking collars optional)
- Exterior corrosion resistant gel coat barrier with U.V. inhibitors
In addition, Openchannelflow offers a wide array of optional accessories to help you customize your flow monitoring manhole to fit your specific needs, including:
- Integral fiberglass benches
- Additional manhole thru-wall couplings (for power / controls / etc.)
- Full and half diameter fiberglass grating platforms
- General purpose and hazardous location lighting
- Powered and unpowered ventilation
- Equipment shelves and mounting panels
- Two-piece construction for ease of handling
1Aluminum hatch and highway loading top styles only.