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Traditionally flumes are used to measure at or below grade flows.  These flow are commonly natural channels (gullies, swales, creeks, streams, and rivers) or manmade channels (treatment plants or storm drains) / piping.  But what happens when the flow to be measured in…

The Iowa Institute of Hydraulic Research has posted an excerpt of one of their older videos, Fluid Motion in a Gravitation Field:  Flow Over Weirs.  The video, developed with the support of the National Science Foundation, covers, among other things, the need for…

In developing our line of Fiberglass Equipment Shelters, we took a lot of time to look at the most commonly used, but frequently overlooked part:  the door. Now we realized that shelter doors aren’t sexy or glamorous, and you’re right…a properly built door…

The Department of Civil Engineering and Geomatics' Hydraulics Laboratory at Universidad Nacional Autónoma de México has an interesting video posted showing the hydraulic profile of a Parshall flume under both free and submerged flow conditions.

Packaged Metering Manholes from Openchannelflow are available with a wide range of options to help customize them to your particular application needs.  A key element of this customization is the variety of top access options available, with each top specially engineer for a…

More common on Parshall flumes, end adapters are also available on Cutthroat flumes from Openchannelflow.  End adapters are specially formed transitions to allow water to flow into / out of a flume in a controlled manner.  On the inlet, end adapters are designed to…

Flow Sampling Manholes are specialized manholes designed for:  Measuring wastewater / pre-treatment flows Water quality sampling Parameter monitoring  Flow Sampling Manholes are most commonly used by industrial dischargers as part of a city's / county's permit…

While the Parshall flume addresses many water measurement applications well, there are times when it just isn’t quite for the application.  At those times a modification of the Parshall may be a better fit.  Usually these modifications are driven by cost,…

In its simplest form a Packaged Metering Manhole (PMM) consists of a primary device (typically a flume or weir) molded into a fiberglass (FRP) manhole.  By directly factory integrating the primary device, a single-piece, drop in-place flow monitoring solution is…

There are three general types of staff gauges used to measure flow in primary devices:  molded-in, adhesive, and rigid.  Of the three, the adhesive gauge is the least durable.  This is not to say, however, that adhesive gauges do not serve a purpose, only that…

Traditionally end adapters for flume are specially shaped transitions attached to the inlet or outlet of a flume for inline connection with piping.  But did you know that end adapters can also be used to transition and condition flows in open channels?   Well, they…

Openchannelflow is please to introduce our new line of One-Piece Fiberglass Shelters.  These shelters are built for rugged, year round use in the most demanding of conditions.  Molded from high strength, corrosion resistant fiberglass, Openchannelflow fiberglass…

Openchannelflow is pleased to announce the release of our new line of Redstone Series Fiberglass Enclosures to house monitoring equipment and provided secure storage of chemicals and equipment. Redstone Series enclosures are designed to be aesthetically pleasing and blend into…

In cases where the flow stream is clean and clear of fibrous / sanitary / large solids, Tranquilizer Racks can be used to slow the flow stream prior to it entering the flume.  Typically used in rows of two or more, Tranquilizer Racks serve to break up the flow stream –…

For applications where the depth of a Packaged Fiberglass Manhole has been undersized, Openchannelflow offers Manhole Extensions.  These Extensions are designed to provide standardized solution integrating the height modification, top, and ladder into a single drop-in-place…

Customer - SJ Louis Construction of Texas Designed by Black & Veatch of Kansas City, MO, the Mill Creek Regional - Effluent Tunnel project in Shawnee, Kansas is designed to eliminate the risk of sewage spills into the Kansas river during heavy rains. A key element of the…

One of the problems contractors often face when installing a flume in a concrete manhole is forming the transitions into / out of the flume.  Done poorly and the result is a flume that either experiences turbulence or submergence – both which will seriously compromise…

Customer - USAF Vandenberg AFB / Pillar Point AFS Tetra Tech of San Luis Obispo, CA approached Openchannelflow with a unique application:  the US Air Force was about to install a composite sampler necessary to comply with federal environmental regulations and the nature…