This document provides an overview of flow measurement devices categorized by general classification and operating principle. It describes venturi meters, orifice plates, and weirs which function by measuring the reduction in pressure between two points, with the pressure differential being directly proportional to flow rate. Parshall flumes are also summarized, which operate based on the relationship between flow rate, width of the throat, and upstream head. Finally, equations are presented for calculating flow using various metering structures.

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