What profile method do you use for different types of flows?

Document ID

Document ID TE8258

Published Date

Published Date 03/12/2018
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Question
What profile method do you use for different types of flows?
Summary
Selecting the proper velocity profile method.
Answer

There are four methods for profiling a flow monitoring site. The method chosen depends on the conditions at the site. Please choose the option below that best fits your application for the proper procedure:

Low flows
Flows of less than two inches’ depth. Use the 0.9 x VMax Profile Method.
Or
Low flows
Sites free of obstructions, etc., but without sufficient depth to measure the velocity at three points. Use the 0.4 Profile Method.

Rapidly changing flows  — 
Flows that change more than 10% in three minutes or less can be classified as rapidly changing. Use the 0.9 x VMax Profile Method .

Typical flows
Any site which does not have any disturbances, obstructions, turbulence, etc. Use the 0.2, 0.4, 0.8 Profile Method

Asymmetrical flows
Sites that have velocities that differ by more than 30% on either side of the pipe (for example, near a bend). Use the 2D Profile Method.

Vertical drops
Sites that are near an outfall or other change in depth. 2D Profile Method

Irregular flows
Any site thought to have an irregular or non-typical profile. 2D Profile Method

 

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