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Galvanized steel is commonly used for flumes and (somewhat less so) weirs in irrigation and water rights applications. Galvanized steel is economical and can provide a good useful lifespan.

At its simplest, a weir box is a fabricated channel into which a weir plate has been installed.

A Packaged Metering Manhole (PMM) is a factory-integrated fiberglass manhole that mounts a flume, weir, mag meter, or other primary device to allow a user to measure or sample flows from full or non-full pipes. The manhole tube can also be supplied with a range of accessories,…

A flow measuring weir is simply a structure over which water flows in such a way that volumetric flow rate can be calculated….it lets you know how much water is flowing. Many times a flow measuring weir is simply a thin plate across a flow stream, but weirs can also be broad,…

Weirs are often described as “simple” and “low cost” ways of measuring open channel flows and, made of some materials they really are low cost. But this low cost comes at a price. Steel plate is frequently used to keep costs down and, when it is new, it’s a perfectly…

Weirs, like flumes, work by accelerating slow, sub-critical flow (Fr1). The acceleration develops a know relationship between level and flow upstream of the weir itself. But what happens when the flow approaching the weir isn’t sub-critical, but instead is critical or…

Measuring open channel (non-full pipe) flows in round pipes can be difficult when measurement costs need to be low or where power is not available at the site. There are proprietary weir inserts available, but they can be inconveniently sizes or insensitive or unrated for the…

YouTube user Pener Pã has posted an interesting video showing the installation of a Rectangular Weir Plate with End Contractions into a natural channel.

With the adoption of SB 88 by the California State Water Board all smaller water users are now required to monitor and report the usage. This can be daunting. But take hope…all is not lost! At the center of any compliance program is the flow meter. For non-pumped sources, a…

The traditional use for a staff gauge is to provide a visual way of determining the water level in some body of water (lake, river, flume, weir, etc.). Depending on the type of gauge, the level gradations can be anything desired - feet, meters, inches, yards, etc.

There are several components to measurement errors when using Staff (Level) Gauges to determine flow depth in a flume or weir. In general, staff gauge reading errors can be attributed to:

For those unused to measuring seepage from embankment dams knowing when to measure can sometimes be challenging. In its Embankment Dam Instrumentation Manual, the Bureau of Reclamation lays out how frequently inspections should be made. Note that the table below indicates only…