Industry Leader in Durable and Self Cleaning Flumes

Originally developed by the U.S. Soil Conservation Service to measure flows in irrigation channels, the Trapezoidal flume is now used in growing number of sanitary and industrial sewer applications with very low rates.

Conforms to natural channels
Conveys large flows; accurate for low flows
Several styles available
   Operates at deeper levels than Parshall   

Available in Multiple Sizes with Many Options

Trapezoidal flumes are generally sized by throat width and geometry. A number of styles are commercially available. The most commonly used types are listed in the chart below. While not as common, several other types of Trapezoidal flumes that may be encountered including those defined by Robinson and Chamberlain.

Primary Advantages

  • The straight through bottom (for silt and debris passage)
  • Ability to operate under higher degrees of submergence than Parshall flumes
  • Trapezoidal cross-section (conforms to natural channels and conveys large flows while providing accuracy for low flows)

Options and Accessories

  • Ultrasonic mounting brackets
  • Bubble tubes
  • Sample tubes
  • Submerged probe cavities
  • Stilling wells (detached)
  • Staff gauges
  • Removable probe holders
  • Inlet and outlet end adapters
  • Pipe stubs
  • Flanged end connections
  • Fiberglass grating
  • Riser boxes
  • Multi-piece construction
  • Chemically resistant gel coat
  • trapezoidal flume
  • Trapezoidal Flume
  • fiberglass trapezoidal flume

Technical Details

Flume Sizes and Recommended Flow Ranges

Size & Style Recommended Flow Rates
Small 60 Degree V 1 – 43 GPM
Large 60 Degree V 1 – 156 GPM
Extra Large 60 Degree V 1 – 663 GPM
8” 60 Degree 101 – 7955 GPM
12″ X 45 – degree 74 – 2681 GPM

Additional Examples

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