Blog

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.

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…

With Free Flow, Inc. (formerly of Gretna, NE) closing at the end of 2012, Openchannelflow would like to extend a welcome to its former customers who are in need of assistance with their flow monitoring needs. Openchannelflow offers these as well as many other products for the…

Fiberglass Packaged Metering Manholes are a great solution to the problem of measuring piped flows below grade and provide a unique set of benefits to consulting engineers who specify them. Accuracy, in this context means, installation accuracy by the contractor and the flow…

Every year at Openchannelflow we talk with several hundred consultants, researchers, contractors and end-users about their flow monitoring needs. Because we work extremely hard at answering all questions "flow” on this web site – and this blog in particular - we are often…

Parshall Flume Metering Manholes are an excellent solution to the problem of how to monitor below-grade piped flows. Integrating the popular Parshall flume into a fiberglass manhole, Parshall Flume Metering Manholes are complete, factory-integrated structures capable of direct…

Trapezoidal flumes are popular choice when industrial users need to measure pretreatment discharges. The trapezoidal shape of the flumes provides sensitivity to the low flow rates (like during a plant shut down), while retaining the ability to handle large, peaking flows (from…