Open Channel Flow Meter Types

Some of the more common methods currently in use to measure open channel flows are.

Open channel flow meter types.

The flow meters use a non contact level sensor to detect the water level and then calculates the flow rate and volume using the manning equation and characteristics of the channel. Partially filled pipes flow is also an example of open channel flow. These dam like structures or overflows allow for a limited or concentrated free flow of liquids based on the unique shape and size of the structure. Rivers natural and artificial canals streams channels etc.

The parshall flume is an economical and accurate way of measuring the flow of water in open channels and non full pipes. What is slightly confusing about this terminology is that the flow of liquids in partially filled pipes when not under pressure is also considered open channel flow. Types of open channel flow. Open channel flow occurs when liquid flows in a conduit or channel with a free surface.

Rivers streams canals and irrigation ditches provide examples of open channel flow. Open chanel flow is that type of flow which is neither completely enclosed by the boundaries nor is under any external pressure but gravity. Open channel flow meters measurement of liquid in open channels include v notch weirs and flumes. Open channel flow meters measure level flow rate and total volume of water flowing through weirs flumes channels and partially filled pipes.

Hs h hl flumes. This type of flow meter allows for a reading of the flowrate to be calculated. All manner of primary structures have been used the world over including v notches rectangular weirs parshall flumes h flumes crump weirs flat v and many other hybrid versions. Open channel flow the flow of liquid through the open channel can be of several types like steady and unsteady flow laminar or turbulent flow or uniform or non uniform flow and finally sub critical critical and supercritical flow.

Open channel flowmeters most techniques used to meter flow in pipes are not applicable to flow in open channels. 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. Special devices such as the parshall flume are required. 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. Open channels are those natural and man made structures through which water flows with a free surface. Parshall flumes are one of the most widely used flumes for permanent flow monitoring.