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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 styles available, with each top specially engineer for a site’s…

Flow Sampling Manholes are specialized manholes designed 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 created.

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 piece.

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…

Can a new flume be installed in an existing Packaged Metering Manhole? Maybe. There are a number of factors to consider: manhole barrel diameter, manhole top style, existing flume style / size, and desired flume style / size.

wastewater can be a pain to accurately measure. The environment is corrosive and humid; while the flow itself can experience wide swings due inflow and infiltration. Wastewater is usually carried in non-full open channel pipes. Measuring in these pipes is considerably more…

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 manholes (FRP) posses a wealth of benefits; modularity is not one of them. Because all of the elements are…

Fiberglass Diversion Manholes are way of controlling open channel flows in a factory integrated design. Utilizing the core design of our standard fiberglass manholes, Diversion Manholes provide corrosion resistance, speed of installation, and ease of use. A variety of flow…

One of the oft-mentioned benefits Packaged Metering Manholes is the ability to integrate flumes and other structures that are larger than the manhole barrel diameter, but what exactly does this mean? For below grade applications – typically sanitary sewer mains or…

As we’ve seen before in our comparison of H-flume and Parshall flume manufacturers, not all “equal” products are just that…equal.

Let’s be honest: metering manholes (from an upfront, material cost standpoint) aren’t cheap. While no one would argue that metering manholes don't provide substantial benefit to their users, part of what you are paying for is a unit that is ready for immediate installation…