Open Channel Water Flow Measurement Devices

Contracting the flow cross section narrowing the channel.

Open channel water flow measurement devices. Our open channel flow measurement section includes our microflow products which deliver accurate and efficient velocity flow measurement presented either as a stand alone device or as part of a complete area velocity flow meter system. Lowering the bottom of the channel. For flow measurement purposed a hydraulic structure is a fixed geometry device that is placed into the flow so that all of the flow is directed through or over the device. Each has advantages and disadvantages and understanding these can hel p you decide which one to choose.

Rivers streams canals and irrigation ditches provide examples of open channel flow. Flumes are specially shaped engineered structures that are used to measure the flow of water in open channels. Flow measurement devices strive to achieve this critical flow for various conditions thus providing an accurate means of measurement. Standard metergates w eirs and flumes are common devices installed in open channels and irrigation ditches to measure water flow.

Open channel flow occurs when liquid flows in a conduit or channel with a free surface. Using ultrasonic level technology open channel flow meters include a non contacting sensor mounted above the flume or weir. Unlike some flow measurement applications such as magflo meters and drinking water open channel flow measurement can be a complex application. The common method of measuring flow through an open channel is to measure the height or head of the liquid as it passes over an obstruction a flume or weir in the channel.

If the discharger s flow measurement system is accurate within 10 percent of the actual flow the investigator can use the existing system. The choice of which device to use will depend on channel size range of flow rates and flow gradient. In general a hydraulic structure is anything that can be used to divert dam restrict or otherwise manage the flow of open channel waters. Even regularly maintained level based ultrasonic or radar flow meters properly installed in an ideal location will give inaccurate discharge flow measurements if the operator uses poor measuring.

Measuring flow into a reservoir is a common application where open channel flow measurement comes into play. Measurement of flow whether it s liquid or solid. Accuracy of flow sensors and recorders for open channel flow devices can be checked by making an instantaneous measurement utilizing the primary flow device and comparing this against the recorder reading. Raising the bottom of the channel.