The Parshall flume is a specially designed hydraulic structure used to measure water flow in open channels such as streambeds. Typically made of concrete, metal, or plastic, it features a converging–throat–diverging shape, allowing for accurate flow measurement based on water depth at specific points within the structure, using pre-calibrated formulas. It helps regulate flow for more precise readings and is preferred for its resistance to clogging, low energy loss, and ease of maintenance. Parshall flumes are commonly used in streambeds for flood control, irrigation systems, and wastewater monitoring.