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Many of the mounting and end connections developed for the Parshall flumes we manufacture can also be used for our Trapezoidal flumes.


Trapezoidal Flume Mounting

Concrete Channels

Trapezoidal flume grouted into a concrete manholeConcrete encapsulation is the most common method of installing a Trapezoidal flume when it's not used to measure watershed or irrigation flows.  The flume is set in an oversized, roughed in channel and then grouted into place.  To help secure the flume during installation and make sure that it does not float out of place, wire is run through the anchor clips on the outside of the flume back to rebar before the grout pour begins.

In both concrete and earthen channel installations, the inside of flume may need to be cribbed and will need to be weighted (so that it doesn’t shift out of position). Once the installation has been completed, the cribbing is removed.

Earthen Channels

stainless steel Trapezoidal flume measuring pond dischargeFor earthen channel installations an oversized area is excavated, typically bedded on a compactable base, and then backfilled.  To help secure the flume in place, earth anchors or threaded rod is typically run through the anchor clips on the outside of the flume.

Flow bypass can be a concern upstream of the flume and both here and downstream (where scour is a concern) geotextiles may be used.

In both concrete and earthen channel installations, the inside of flume may need to be cribbed and will need to be weighted (so that it doesn’t shift out of position). Once the installation has been completed, the cribbing is removed.

Integrated Enclosures

Trapezoidal flume mounted in a Redstone fiberglass enclosureAbove grade industrial flows may require that a small monitoring flume be secured.  For those applications, Openchannelflow offers factory integration of a Small, Large, and Extra Large 60º Trapezoidal flumes into one of our Redstone Fiberglass Equipment Enclosures.  

The result is a secure, integrated solution that allows for the accurate measurement of flows while maintaining data integrity.

Flow Metering Manholes

For applications where below grade flow monitoring is required, Openchannelflow offers Trapezoidal flumes integrated into our fiberglass Packaged Metering Manholes.


Trapezoidal Flume End Connections

End Adapter

fiberglass Trapezoidal flume end adapterEnd connections for Trapezoidal flumes revolve around the end adapter.  Trapezoidal flume end adapters are specially shaped structures that attach to the end of the flume that allow flow to be transitioned into / out of the flume in a controlled manner.  

End adapters can be provides with pipe stubs, flanges, or caulking collars to connect to piping.  Additionally, end adapters can be left with the ends open if necessary.  

End adapters are also convenient locations to mount other accessories that otherwise would not fit in the flume itself.

Staged Manhole Transitions

Trapezoidal flume staged manhole end adapterTaking our standard Trapezoidal end adapter, a curved is molded into the piece so that the flume can now be directly connected to a manhole wall – eliminating the need to either form a transition or have a pipe connection to the flume.  Staged transitions are available for Large and Extra Large 60º Trapezoidal flumes and manhole diameters.  Contact Openchannelflow for additional details.