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Flat fiberglass tops on Packaged Metering Manholes provide a low visual profile without the need for a grade ring / frame / cover system. All fiberglass construction means the tops are corrosion-resistant and extremely strong – capable of withstanding pedestrian foot traffic…

At Openchannelflow we understand that not everyone who uses flow products does so on a regular basis. To help out the uninitiated or those needing a refresher, Openchannelflow has put together a series of blog articles covering the anatomy / nomenclature of our various flow…

Fiberglass Flow Metering Manholes from Openchannelflow are a great solution to the problem of needing to measuring below ground flows. The manholes are light weight, corrosion resistant, watertight, and come with flume, weir, or mag meter already factory integrated.

It's a common for a treatment system operator need to measure the flow of sewage in a wastewater collection system. These flows are below grade and are usually under open channel (non-full pipe) conditions. In some cases, existing manholes or vaults can be used. Into these a…

For a flume to operate correctly, the approaching flows must be subcritical and well developed. Sometimes, however, the approaching flow has high velocity or is turbulent due to steep pipe slopes or pumped flow. To control and condition these flows, Openchannelflow offers Energy…

Publically owned wastewater treatment plants (POTWs) collect wastewater from homes, commercial and industrial facilities and remove harmful organisms and other pollutants so that the treated water can be returned to the environment without impact the receiving waters. As part of…

The domed top style is the most popular style of top for fiberglass metering manholes - outselling both H-20 traffic reducer and aluminum top styles 2:1. The dome top is specifically formed to provide rigidity and strength while still being light enough for operators to open. A…

For a flume to operate properly the flow entering it must be: In below grade applications, one device can help a user do all three: The Energy Absorbing Manhole.

Flow Metering Manholes can be grouped into two types: open pipe and closed pipe. Closed pipe flow metering manholes use mag meters, clamp on meters, and insertion meters. Open channel manholes incorporate flumes, weirs, or direct sensing (radar, laser, or area velocity) meters.

Sewer Surcharging is overloading the carrying capacity of a sewer system due to inflow and/or infiltration. As part of any inspection of a flow manhole site, the operator should look for signs of surcharging in order to ensure that their collection system is operating correctly.

Monitoring the flow of sewage is dirty and smelly, but that doesn’t mean it has to be hard! Many of the problems encountered in measuring surface and / or irrigation waters – high solids content, debris, the need to minimize head loss – are also present in sanitary…

Parshall flumes should not be placed at an elevation lower than that of the channel being measured for fear of inadvertently inducing supercritical flow in the flume (and a hydraulic jump) in the flume. Field observations have shown that supercritical flows can result in the…