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Best hydraulic section

  1. Mar 4, 2017 #1
    1. The problem statement, all variables and given/known data
    Determine the depth of the flow of channel if the best hydraulic channel is needd for composite channel in figure to convey flow rate of 6.5(m^3/s) , Manning coefficient n on bed slope are 0.015 and 0.0015 respectively .
    2. Relevant equations


    3. The attempt at a solution
    I assume the total flow rate of composite channel is 6.5(m^3/s) .. so From the table , i gt z = 1 / sqrt(3) , A = (sqrt(3) + 2 ) (y^2) = 3.73(y^2)
    P = 4y +2sqrt(2) = 6.83 y
    So , From manning equation , Q = (1/n)(A)(R^(2/3))(sqrt bed slope) ,

    so , n = 0.015 , bed slope = 0.0015 , i found that y = 2.4 , is my ans and concept correct ?
     

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  2. jcsd
  3. Mar 4, 2017 #2
    Anyone can try to help ?
     
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