According to Wikipedia, an orifice plate is a thin plate with a precisely sized opening used to measure or control the flow of liquids and gases in a pipeline. By creating a pressure difference across the plate, engineers can calculate flow rates and regulate system performance.

Orifice plates are commonly used in water distribution, stormwater infrastructure, wastewater systems, and industrial utilities where accurate flow measurement and pressure control are important for reliable operations. Their simple design, affordability, and effectiveness make them a widely used component in modern civil and mechanical engineering systems.