Open channel flow meters, according to different measurement principles, are further divided intoUltrasonic open channel flowmeterDoppler open channel flowmeter and multi-channel open channel flowmeter are system monitoring devices used to measure fluid flow in open channels or channels. Open channel flowmeter monitoring system, suitable for reservoirs, rivers, water conservancy projects, urban water supplysewageRectangular and trapezoidal open channels for processing, farmland irrigation, water management, water resources, etcculvertTraffic measurement. In recent years, it has been widely used.