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Most renters will use a surface water flow meter that uses velocity and area to calculate the flow. A probe with the propeller is inserted into the moving water. A display unit shows the velocity of the water in cubic meters or liters.
How surface water flow meters work
In order to determine the surface water flow you must calculate the velocity and cross-sectional area. The area can be measured by calculating the depth and width of the water. Velocity is measured with a current meter, which uses a propeller that is turned by the current to calculate the speed of the water. Another option for calculating surface water flow is to use a weir. The weir is used to control the flow of water. A v-shaped cut in the weir allows the water through. The height of the water flow at the deepest part of the v-shaped cutout is used to calculate the flow of the surface water.
About surface water flow meters
The water on the surface of the earth in rivers, lakes, streams, and oceans is called surface water. The movement of this water is referred to as surface water flow. Flow is measured for water quality monitoring, in determining the supply available for use, or to check the amount of water moving through a specific area.