Affordable Choice for RBC Flumes and Weir Boxes

Five portable flumes were developed in the mid-1980’s  for use in measuring very low flows in furrows and small earthen channels. More accurately defined as broad-crested weirs; RBC flumes are in some ways a cross between Trapezoidal and Palmer-Bowlus flumes.

RBC Flume Characteristics

RBC flumes are sized by throat width and range in size from 50mm to 200mm. The flumes are scale models of each other (as with Palmer-Bowlus flumes) and follow standardized dimensions. For flumes provided without the inlet and outlet wingwalls, grout should be used to create a smooth transition from the channel into and out of the flume. RBC flumes should only be used in those applications where little or no solids are expected due to the physical size of the flume. Channel slope should not exceed 1%.

Primary Advantages

  • The ability to accurately measure (+/-2%) very low flows
  • Simple construction
  • Trapezoidal cross-section (conforms to natural channels)
  • Portability

Options and Accessories

  • Ultrasonic mounting brackets (only suggest for use with stilling wells or the 200mm size flume)
  • Bubble tubes
  • Stilling wells (detached)
  • Staff gauges
  • Inlet and outlet wingwalls
  • Chemically resistant gel coat
wastewater flumes

From left to right: 150mm (with bubble tube),
75 mm, and 100mm RBC flumes

Technical Details

Flume Sizes and Recommended Flow Ranges

Size & Style Recommended Flow Rates
50mm 0.5 – 23 GPM
75mm 2 – 68 GPM
100mm 3 – 139 GPM
150mm 8 – 391 GPM
200mm 17 – 790 GPM

Additional Examples

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