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Packaged Metering Manholes (PMMs) factory integrate a flow measurement flume / weir into a fiberglass manhole to provide a complete, turn-key solution to monitor industrial and municipal flows.  Openchannelflow Packaged Metering Manholes come complete and ready for…

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 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…

Portable weir plates have always been a great way to stretch your research dollars.  The modular design allow you to tailor your flow measurement set-up with the need for costly custom construction.  Building upon what was already a successful product, we've…

Bubbler flow meters can be an excellent flow meter choice when measuring flows in flumes or weir boxes.  Bubbler flow meters are unaffected by wind, foam, steam, and floating solids and provide a high level of measurement accuracy.  Adapting bubbler meters for use with…

As we’ve seen before in our comparison of H-flume and Parshall flume manufacturers, not all “equal” products are just that…equal. Here we compare the construction details of Packaged Metering Manholes.  Packaged Metering Manholes take proven open…

Customer - Lonza Mapleton AMEC in Peoria, IL approached Openchannelflow with a unique application:  an industrial customer of theirs needed to measure storm water flows in an existing earthen channel.   Find out how Openchannelflow helped AMEC solve their customers…

The key to an accurate weir installation is the correctly sizing the upstream weir pool.  You can guarantee a successful weir installation every time if you follow these nine easy steps! The approach channel should be straight and of uniform cross-section for a distance of…

Sometimes measuring discharge from lakes and ponds can be challenging…particularly when there isn’t a convenient spot to put a discharge weir or flume. One arrangement that has been used successfully is a vertical standpipe with a weir box mounted to the top. 

Weir boxes are the preferred method of monitoring seeps from concrete and earthern dams.   Their ability to meaure low flows and retain sediment for future investigation make them a natural choice for the application.  The small foot print and ability to have differnt…

One problem application we see time and time again is measuring the flow out of a UV disinfection system.  UV disinfection systems usually have V-shaped overflow weirs just downstream of the lamp banks.   Parshall flumes are then placed immediately downstream to measure…

Rectangular weirs can be a good fit for Water Rights applications where the soil at the installation site is stony / has large rocks (making the installation of a flume difficult or expensive) or where a realtively large volume of water must be metered in a realtively narrow…