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Weir Boxes
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Weir Boxes are pre-engineered structures that are often used to measure dam seepage and industrial discharges. Each unit includes a box, weir plate, baffle plate, and end connections. Unlike most other primary devices, Weir Boxes can have multiple inlet and outlets, either combining in a single cell or splitting into separate flow cells.
Weir Boxes follow ISO 1438 standards and are versatile enough to be used:
- Above ground or underground.
- With non-full piped and free spilling flows.
- To accommodate and measure multiple flow streams.
Openchannelflow Weir Boxes come in (3) sizes: small, medium, and large. Each is crafted to ensure the proper flow rate before water runs over the weir plate.
If you need a custom size or need to configure a Weir Box to your specific site needs, Openchannelflow can create those, too.
Just like Fixed or Portable Weir Plates, Weir Boxes:
Shouldn’t be used on pressurized conduits, or flows with floating trash, debris, or lots of solids.
Are often a good fit for applications like dam seepage as they collect sediments / debris upstream of the weir plate.
Although they are designed to measure flows at ordinary temperatures (39 to 86ºF) [3.9 to 30º C], they can be used in colder flows if a power source is available to add an immersion heater to keep ice from forming.
Weir Boxes are available in:
- Aluminum, a lightweight choice that’s easy to move and inexpensive to transport.
- Fiberglass box with a stainless steel weir plate for measuring treated industrial flows.
- Stainless steel, the most common for dam seepage and demanding industrial discharge monitoring.
Make the most of Weir Boxes with accessories including:
- End Connections like pipe stubs, flanges, caulking collars, free-spill configurations, and splash guards to help control and transition flow into and out of the Weir Box.
- Flow Conditioning options like energy absorbers to help slow a flow or baffles to ensure consistent flow speeds.
- Flow Meter Mounts and Parameter Mounts ensure sensors are in the right point of measurement within the Weir Box, plus are easy for operators to use and adjust.
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