Blog

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…

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…

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…

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…

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,…

Parshall Flume Flow Monitoring Manholes from Openchannelflow take the tried and true Parshall flume and factory integrate it into a fiberglass manhole. The resultant structure is perfect for monitoring industrial discharges, municipal sewers, and dam seepage on below grade…

For installations where a Packaged Metering Manhole will be located away from vehicle and pedestrian traffic, Openchannelflow offers domed fiberglass tops. These tops are lightweight, structurally strong, and provide excellent operator access.