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Fixed Weir Plates
Fixed Weir Plates are an inexpensive way to measure clean water flows in open channels. A Fixed Weir Plate is like a dam with a notch for water to flow over.
Fixed Weir Plates are a simple solution and popular choice for measuring water flows at ordinary temperatures.
Openchannelflow Fixed Weir Plates can be used on surface waters (like creeks and streams), open channels, canals, and even non-full pipes. They’re great for applications like dam seepage where flow needs to be measured but where solids also need to be captured.
They are called “fixed” because they are installed perpendicular to flow and stay in place, either across entire channel or attached to another structure that spans a channel.
Flows with stringy or heavy solids can drop out upstream or collect on the weir’s crest (flow edge). If your flow includes these solids, a flume might be a better choice.
Reading a weir is easiest when flow has been stopped, but stopped flow isn’t a requirement. For Fixed Weir Plates to provide accurate measurements, it’s essential they are appropriately maintained and not used on:
- Pressurized conduits.
- Flows with temperatures low enough for ice to form.
- Flows with floating trash, debris, or lots of solids.
Fixed Weir Plates are available in:
- Stainless steel and more specifically, T-304 stainless steel is the standard material because it is strong enough to resist swelling and damage. While strong, stainless steel Fixed Weir Plates can be heavy.
- Aluminum, a lightweight choice that makes plates easy to move and inexpensive to transport.
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