12” 45 Degree (#1) Trapezoidal Flume with Staff Gauge

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.

Primary advantages include:

• 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)

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.

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

Listed below are standard Trapezoidal flumes and their recommended flow ranges.

Specifications - Installation Instructions - Typical Drawing

If you would like additional information, pricing, or assistance in sizing and specifying a flume, please fill out and submit our
flume application form.