Stormwater Outfall Design - Permanent Energy Dissipation

Discussion in 'Hydraulic Engineering' started by engr82, Apr 20, 2016.

  1. engr82

    engr82 Novice

    Hi everyone,

    I have been going through some different criteria manuals for the design of permanent energy dissipation and one thing that I'm finding a bit surprising is the lack of clarity on what flow should be used for the design of the energy dissipation feature.

    Obviously, the velocity could vary (somewhat significantly) depending on if the pipe is flowing full or partially full and that will certainly affect the design of the energy dissipation since that is dependent on velocity...yet I am not seeing anything definitive on what flow/velocity should be used. Most manuals just say to figure out "your flow" or "your velocity" but how should I decide what that is? Is there a generally accepted standard for what design flow/velocity to use? Is it to assume the pipe is flowing full or should it be worst case scenario which would be partially full?

    Thanks in advance for your help!

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