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At flow monitoring stations where a Packaged Metering Manhole is used to measure / sample a flow stream, the flow monitoring and sampling equipment is usually housed either in a dedicated equipment shelter or in a nearby building.  There are times, however, when neither…

Industrial Flow Monitoring / Sampling Stations provide pre-engineered, factory integrated solutions to the need for industrial dischargers to monitor, sample, and report their NPDES discharges.   A typical station consists of two parts: fiberglass Packaged Metering Manhole…

To help the growing list of operators of our fiberglass Packaged Metering Manholes maintain their investments, Openchannelflow has put together an inspection form to standardize the collection and reporting of data useful in establishing maintenance cycles for Packaged…

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…

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…

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…

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…

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…

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…

The old adage of taking  measuring twice and cutting once has never been so appropriate as it is when determining the depth of a fiberglass manhole.  Although fiberglass (FRP) manholes posses a wealth of benefits; modularity is not one of them.  Because all of the…

Fiberglass Diversion Manholes are way of controlling open channel flows in a factory integrated design.  Utilizing the core design of standard Flow Metering Manholes, Diversion Manholes provide corrosion resistance, speed of installation, and ease of use.  Dig It!…