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The primary purpose of a stilling well is to provide a area were level measurements can be taken free of wave action or water surges. The surges and wind waves present in the main body of flow can be dampened by restricting the opening area of the inlet port.

Since its introduction in the 1930’s, the Palmer Bowlus Flume has grown to be the second most common flume for measuring sanitary flows. There are, however, several distinct disadvantages in using Palmer Bowlus flumes. Unlike other styles of flumes that have strictly defined…

The Palmer Bowlus flume was designed for installation in existing manholes and in line with sewer piping / channels. These sorts of installations normally see nice average to upper range flows.

Like H flumes, on free-spilling discharges from pipe where more accuracy (+/- 3-5%) is needed that the California Pipe Method can supply (+/-10%), Montana flumes can be used to for accurate flow measurement.

On free-spilling discharges from pipe where more accuracy (+/- 3-5%) is needed that the California Pipe Method can supply (+/-10%), it is common to see H flumes used.

Automatic Samplers (also called autosamplers or simply samplers) collect and store water samples for laboratory analysis without the need for operator intervention. When used in conjunction with a flume or weir, automatic samplers can collect samples that are truly representative…

As winter approaches, the problem of how to continue accurate flow measurement raises its ugly head. The flumes most affected by cold weather are those that are measuring runoff flows. These are typically H Flumes mounted at or above grade and usually don’t see continuous…

The buildup of solids can wreak havoc on otherwise good flume applications if the style of flume isn’t well chosen.

The Parshall flume is the most widely used flume for measuring the flow of water in open channels and non-full pipes. The flumes have a number of distinct operational advantages, including:

The accuracy of the depth-discharge relations for Palmer Bowlus flumes in not considered to be constant over the full range of flows. The decrease in accuracy reflects the increased importance (and uncertainty) of the Coefficient of Discharge (Cd) at low flows.

For a flume to operate correctly the flow approaching it must be sub-critical and under open channel (non-full pipe) flow conditions. Sometimes, however, the space available at a site means that where the flume has to be situated clashes with the ability to properly condition the…

The Parshall flume is widely used to measure open channel flows both above and below grade. Above grade the flume is typically cast into a long, straight concrete channel or is free-standing with inlet / outlet end adapters and pipe stubs to connect the flume to piping. Below…