Common Flow Metering Methods in Open Channels Flow = 10 feet per second * 10 square feet = 100 cubic feet per second. The velocity is measured as 10 feet per second and the cross sectional area of the flow is measured as 10 square feet. Here is an example of a computation of flow using the continuity equation. This is a useful principle for making flow measurements, as will be demonstrated below. The notion of continuity under steady state conditions results in the product of the velocity * area being equal to a constant at any location along the pipe. The continuity equation can be represented as: This also means that the flow rate in the pipe is the same at any location along the length of the pipe. Continuity Equation for Flowįor water flowing in a pipe under steady-state conditions (i.e., not changing over time), continuity means the water that flows into one end of a pipe must flow out of the other end. This article outlines a few of the more common flow metering methods and provides some background information on flow measurement. There are several methods to measure flows in water resources systems. Measurement of flow in water resources is important for applications such as system control, billing, design, and many other applications. In water resources, flow is often measured in units of cubic feet per second (cfs), cubic meters per second (cms), gallons per minute (gpm), or other various units. Flow is the volume of fluid that passes in a unit of time.
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