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Thread: minor losses in storm sewer junctions

  1. #1
    Associate Engineer
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    minor losses in storm sewer junctions

    A standard equation for determining minor headloss at a 45 degree wye junction "hj=(v out squared - 0.75 x velocity in squared) / 64.4" results in a negative headloss if the upstream velocity is high. Example: inflow velocity = 20.3 fps and outflow velocity = 10.2 fps results in a -3.17 ft loss. How should this result be used in determining headloss?

  2. #2
    Administrator Kelly Bramble's Avatar
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    The general equation for fluid flow loss due to elbows, tees, valves and so on is:

    Losses-joints.gif

    Where:

    K = Coefficient of minor loss
    V = Fluid velocity
    g = gravity as given
    A = Area of pipe or channel
    hm = Minor Loss (Unit of energy/ fluid weight) or Head Loss

  3. #3
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    Thanks, but my question relates to junctions.

  4. #4
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by lazlo View Post
    Thanks, but my question relates to junctions.
    See:

    http://www.engineersedge.com/civil_e...tion_10161.htm

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