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    Hyd 13

    Uploaded by

    Luna Ronquillo
    The document discusses key concepts in hydraulics including: 1. There are two stages of flow - upper tranquil flow and lower rapid flow - that give the same discharge in an open channel. 2. Equations are provided to calculate critical depth, Froude number, discharge, and other parameters for different channel shapes including rectangular and trapezoidal channels. 3. Sample problems are given involving calculating critical depth, flow type, discharge, and other values for flows in various channel geometries.

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    © All Rights Reserved
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    Hyd 13

    Uploaded by

    Luna Ronquillo
    350 views2 pages
    The document discusses key concepts in hydraulics including: 1. There are two stages of flow - upper tranquil flow and lower rapid flow - that give the same discharge in an open channel. 2. Equations are provided to calculate critical depth, Froude number, discharge, and other parameters for different channel shapes including rectangular and trapezoidal channels. 3. Sample problems are given involving calculating critical depth, flow type, discharge, and other values for flows in various channel geometries.

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    Hydraulics

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    The document discusses key concepts in hydraulics including: 1. There are two stages of flow - upper tranquil flow and lower rapid flow - that give the same discharge in an open channel. 2. Equations are provided to calculate critical depth, Froude number, discharge, and other parameters for different channel shapes including rectangular and trapezoidal channels. 3. Sample problems are given involving calculating critical depth, flow type, discharge, and other values for flows in various channel geometries.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    350 views2 pages

    Hyd 13

    Uploaded by

    Luna Ronquillo
    The document discusses key concepts in hydraulics including: 1. There are two stages of flow - upper tranquil flow and lower rapid flow - that give the same discharge in an open channel. 2. Equations are provided to calculate critical depth, Froude number, discharge, and other parameters for different channel shapes including rectangular and trapezoidal channels. 3. Sample problems are given involving calculating critical depth, flow type, discharge, and other values for flows in various channel geometries.

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    © All Rights Reserved
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    Download as pdf or txt
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    Civil Engineering April 2023 Review Innovations Hydraulics 13

    Alternate Stages of Flow Generally (all sections),

    Bc
    - In a channel for a given total head or
    specific energy E, there are two stages of Q2 A 3c

    flow that give the same discharge Q: g Bc
    Ac dc
    1. The upper stage/ tranquil flow
    NF < 1 subcritical

    2. The lower stage/ rapid or shooting flow For rectangular sections:


    NF > 1 supercritical q2 3. Find the critical depth in the trapezoidal
    dc  3 channel shown conveying water at 19 m3/s.
    g
    NF = Froude number Side slope 1V:3H, n= 0.012.

    q = discharge per meter width


    Generally (all sections),
    1. Water flows in a rectangular channel at a
    v
    NF  depth of 1.0 m and a velocity of flow of 4
    gdm m/s.
    a. What is the discharge?
    dm = mean/ average depth (m) b. What is the critical depth? 4. A rectangular planed timber flume (n =
    A c. What is the Froude number? 0.012) 3 m wide is laid on a slope of 0.0011.
    dm 
    B d. Is the flow sub or super-critical? For a depth of flow of 0.90 m:
    B = width of the l.s. (m) e. What is the alternate depth? a. What is the Manning’s C?
    b. What is the uniform flow?
    For rectangular sections: 2. A riveted-steel triangular duct, n=0.015,
    c. What smallest amount of energy can
    flows partly full as shown. If the critical
    give the same amount of flow?
    depth is 60 cm, compute:
    v
    NF  a. Critical flow rate.
    gd b. Critical velocity.
    c. Critical slope.
    Critical depth (dc) = depth of flow where the
    discharge Q is maximum for a given specific
    energy E, or depth of flow where E is minimum
    for a given Q.

    Manila: https://www.facebook.com/ReviewInnovationsOfficial Davao: https://www.facebook.com/reviewinnovations.davaobranch


    Civil Engineering April 2023 Review Innovations Hydraulics 13
    5. Water is flowing in a 12 – m wide
    rectangular channel at 10.5 m3/s and a
    depth of 1.1 m.
    a. What is the specific energy?
    b. What is the critical depth?

    6. The flow rate per unit width in a wide


    channel is q = 2.3 m3/s per m width. Is the
    flow subcritical or supercritical if the depth
    is:
    a. 0.2 m
    b. 0.8 m
    c. 2.5 m

    7. A rectangular channel 3 m wide carries 10


    m3/s at a depth of 2 m.
    a. Is the flow subcritical or supercritical?
    b. For the same flow rate, what depth
    will give critical flow?

    8. Water flows in a 10 – m wide open channel


    with a flow rate of 5 m3/s. Determine the
    two possible depths if the specific energy of
    the flow is E = 0.6 m.

    9. A discharge of 4.5 m3/s occurs in a


    rectangular channel 1.83 m wide with s = 5) 1.132
    0.002 and n = 0.012. 0.427
    a. Find the normal depth for uniform 6) supercritical
    Supercritical
    flow
    subcritical
    b. Determine the critical depth. 7) subcritical
    c. Is the flow subcritical or supercritical? 1.04 m
    8) 0.56 m
    10. Compute the critical depth for a flow at 0.4 0.173 m
    m3/s through a 60° V – notch channel. 9) 1.06 m
    0.851 m
    Subcritical
    10) 0.628

    Manila: https://www.facebook.com/ReviewInnovationsOfficial Davao: https://www.facebook.com/reviewinnovations.davaobranch

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