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About: Packaged metering manhole     Goto   Sponge   NotDistinct   Permalink

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Packaged metering manholes (PMMs) are an outgrowth of the fiberglass manholes developed in the 1960s. Packaged metering manhole factories integrate a primary device (typically a flume or weir) into a fiberglass manhole. The result is a lightweight, single-piece (generally), corrosion resistant structure from which an operator can measure piped flows, take composite samples, and perform water quality parameter monitoring.