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Weir Box

For those instances where low flows require highly accurate measurement, TRACOM offers customized weir boxes for precision flow measurement and sampling. Taking your specific flow rates and flow stream composition into consideration, one of our technical experts sizes each weir box to provide you with a product with the smallest footprint possible while covering the full range of your flows. To make the installation process as easy as possible, our weir boxes are equipped with other necessary components. With your weir box, you will receive a fixed weir plate, fixed inlet baffle (adjustable baffles also available), inlet and discharge areas, and end connections (where required).

Weir Box Sizes

TRACOM weir boxes are high-quality engineered and designed to last for years to come. Additionally, each of our weir boxes are sized in accordance with ISO 1438/1-1990. As a fiberglass product company noted specifically for our customized weir boxes, we offer various product sizes to meet your needs. Our weir boxes can measure flows from 3.990-493.5gpm.

To accurately measure flow levels, choose between small, medium, and large weir boxes with the following types of V-notches:

  • 22 ½ °
  • 30°
  • 45°
  • 60°
  • 90°
  • 120°

In addition to our standard sized weir boxes, TRACOM can create custom sized weir boxes as well. Aren’t sure what size weir box your operation needs? Contact our team today and have one of our representatives point you in the right direction!

Weir Box Applications

Fiberglass weir boxes are used to measure treated industrial flows. They are popular for generating a highly accurate measurement in low flow systems. Weir boxes should not be used in operations that may have floating debris, such as trash or solid contents, as this can raise the weir pool depth and create inaccurate flow readings. Additionally, research has suggested that weirs and weir boxes should only be used with normal flow temperatures (39-86°F). TRACOM will be happy to work with you to design a customized product that meets your operation’s needs!

Weir Box Options and Accessories

To make the most of your weir box TRACOM offers a list of options and accessories. Choose from the following items when making your purchase:

  • Multiple or adjustable baffle plates
  • Ultrasonic mounting brackets
  • Bubble tubes
  • Sample tubes
  • Submerged probe cavities
  • Stilling wells (detached)
  • Staff gauges
  • Removable Probe holders
  • Pipe stubs
  • Flanged end connections
  • FRP grating
  • Solid panel FRP covers (removable or fixed)
  • Chemically resistant gel coat

Learn more about our weir boxes or purchase one today. Call 877-435-8637.

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Weir Box FAQ's

Flumes are good for many situations and are mostly resistant to blockage and backup, but certain flumes may not be as accurate as others. On the other hand, weirs are good for measures very accurately, but due to the plate used to measure, sediment and other materials in the flow may become backed up in under the v-notch.

Primarily, sediment and sewage can effect weir accuracy. Sewage can block up the bottom of the weir plate, which can in turn alter how well the weir measures.

Technical Details