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fiberglass 54-inch L Cutthroat flume manufactured by OpenchannelflowFiberglass (FRP / GRP) Cutthroat Flumes are the most common Cutthroat flumes for a number of different applications - from stream gauging to wastewater treatment plants.  

Fiberglass Advantages

Typically constructed of polyester resins, fiberglass Cutthroat flumes are light weight, corrosion resistant, economical, can have tight dimensional tolerances, and have considerable configuration flexibility.    

Light Weight

Fiberglass Cutthroat flumes are about 1/2 the weight of comparable steel construction flumes and are about the same weight as aluminum construction flumes. Their light weight makes fiberglass Cutthroat particularly suitable for use in remote watershed / catchment monitoring applications where flume weight is an issue.

Corrosion Resistance

Polyester resins are suitable for most surface water, industrial discharge, and wastewater applications where the flow stream may be mildly acid or basic and at atmospheric temperatures.  For more aggressive / higher temperature applications, alternative resin systems (usually vinyl esters or epoxies) can be used, although it is usually more cost effective to use stainless steel construction.


With standard polyester construction, fiberglass Cutthroat flumes are an economical choice - priced between galvanized / painted steel and aluminum / stainless steel construction.

Dimensional Tolerances

The dimensional tolerances for fiberglass Cutthroat flumes are greatly dependent upon the dimensional accuracy of the molds from which they are produced.  For Openchannelflow fiberglass Cutthroat flumes, the following dimensional tolerances are typical:


  • 1/16-inch [1.59 mm] (12-inches or smaller Cutthroat flumes)

  • 3/32-inch [2.38 mm] (18-24-inch Cutthroat flumes)

  • 1/4-inch [6.3518 mm] (36-72-inch Cutthroat flumes)

Other Flume Dimensions

  • 1/8-inch [3.18 mm] (18, 36, and 54-inch L Cutthroat flumes)
  • 1/2-inch [12.7 mm] (108-inch L Cutthroat flumes)

Configuration Flexibility

Openchannelflow fiberglass Cutthroat flumes are available with a wide selection of accessories and mounting / end configuration options.

More About Fiberglass (FRP) Cutthroat Flumes