What is the flow rate measuring device located upstream of the converging wall?

The flume meter, specifically the Parshall flume, is commonly used to measure flow rates in open channel systems, and it works particularly well in applications where the flow characteristics are influenced by various factors such as changes in depth and channel shape. When water flows through a Parshall flume, it speeds up as it passes through a narrow throat, which creates a measurable change in height (head).

The design of the Parshall flume allows for accurate flow measurement even under varying flow conditions, making it an ideal choice for locations upstream of converging walls, where flow profiles can change. This device measures the flow by analyzing the height of the liquid above the flume at a specific point. The calibrated relationship between the height of the water and the flow rate allows operators to determine the volume of water flowing through the channel.

This capability to handle different flows effectively is crucial in wastewater management, where maintaining accurate records of influent and effluent volumes is essential for regulatory compliance and operational efficiency. Other devices like the Venturi meter and weir plates can be used for flow measurement as well, but their applications differ from that of the Parshall flume, especially in terms of design suitability for certain types of channels and flow conditions.