Critical Depth of Open-Channel Flow

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For a given value of specific energy, the critical depth gives the greatest discharge, or conversely, for a given discharge, the specific energy is a minimum for the critical depth.


For rectangular channels, the critical depth, dc ft (m), is given by

dc =[Q2/b2g]1/3

where
dc =critical depth, ft (m)

Q= quantity of flow or discharge, ft3/s (m3/s)

B= width of channel, ft (m)

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Comments
  • Ravi January 6, 2009 at 11:41 am

    Hi,
    It is good………

  • Peppernspice March 20, 2009 at 7:27 pm

    this is what i’ve been looking for..
    simple and straightforward!
    thanks

  • mazetas October 5, 2010 at 11:57 am

    that was short and sharp

  • Flash January 6, 2011 at 7:54 am

    What does q equal if its a wide channel ?

    • Conor March 23, 2011 at 3:00 pm

      q = Q/b ; (m³s-1/m)
      b = the channel width ; (m)
      Q = flow rate ; (m3/s)

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