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    Desilting Basin

    Uploaded by

    Sambhav Poddar
    This document summarizes the design parameters for a settling tank, including: - Intake and flushing discharge rates - Average particle size and specific gravity - Dimensions for width, number of bays, pier width, and total width - Depth of flow and flow velocity - Length of tank - Cross section dimensions for a hopper - Area, width, depth, and flow velocity for a sediment feed duct - Calculations for settling velocity and trap efficiency - References equations for settling velocity based on particle size

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    Attribution Non-Commercial (BY-NC)
    Download as XLSX, PDF, TXT or read online from Scribd

    Desilting Basin

    Uploaded by

    Sambhav Poddar
    421 views5 pages
    This document summarizes the design parameters for a settling tank, including: - Intake and flushing discharge rates - Average particle size and specific gravity - Dimensions for width, number of bays, pier width, and total width - Depth of flow and flow velocity - Length of tank - Cross section dimensions for a hopper - Area, width, depth, and flow velocity for a sediment feed duct - Calculations for settling velocity and trap efficiency - References equations for settling velocity based on particle size

    Original Description:

    desilting basin design for shp by E Mosonyi method

    Original Title

    Desilting basin

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    © Attribution Non-Commercial (BY-NC)

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    This document summarizes the design parameters for a settling tank, including: - Intake and flushing discharge rates - Average particle size and specific gravity - Dimensions for width, number of bays, pier width, and total width - Depth of flow and flow velocity - Length of tank - Cross section dimensions for a hopper - Area, width, depth, and flow velocity for a sediment feed duct - Calculations for settling velocity and trap efficiency - References equations for settling velocity based on particle size

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
    421 views5 pages

    Desilting Basin

    Uploaded by

    Sambhav Poddar
    This document summarizes the design parameters for a settling tank, including: - Intake and flushing discharge rates - Average particle size and specific gravity - Dimensions for width, number of bays, pier width, and total width - Depth of flow and flow velocity - Length of tank - Cross section dimensions for a hopper - Area, width, depth, and flow velocity for a sediment feed duct - Calculations for settling velocity and trap efficiency - References equations for settling velocity based on particle size

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
    of 5

    SETTLING TANK Intake discharge Q = Specific gravity of particles = Average particle size (d)= Flushing Discharge Qf = (take 20%

    of intake discharge) Flow velocity = a= U <= Area reqd = Assume width B = No of bays = Assume pier width = Total width of basin= Depth of flow D = 0.44 0.197 m/s
    2 128 m

    (by Mosonyi) a 25 m /s 2.65 0.2 5 mm m3/s


    3

    d >1 mm 0.1-1 mm <0.1 mm

    0.36 0.44 0.51

    (should be within 0.3-0.5 m/s)

    5.5 m 4 0.6 m 23.8 m 5.818182 m

    (for each bay)

    (area / clear waterway)

    Adjust for effect of turbulence v' = fall velocity w0 = 0.021 m/s (Assumed temp 15C) (corelation between w0 and d, given by Hunter-Rouse)

    0.054724 (also known as settling time)

    t=

    568.64385 s 111.8943 m 112 m

    Length of tank = say

    L/B =

    4.7058824

    (should be more than 4, preferable 8-10)

    Cross Section for Hopper 5.5 m

    2.4 m 0.8 m 45

    0.65 m 0.5 m

    Assume flow velocity = Area reqd for SFD = Assume width of duct = Depth of duct = say

    4 m/s 0.3125 m 0.5 m 0.625 m 0.65 m


    2

    w0 X L = UXD

    2.052449

    w0 X (D)^1/6 n X U X g

    2.538687

    rugosity n =

    0.018

    trap efficiency = 100 % (from Camp's sediment removal function)

    (by RS Varshney for Himalayan rivers) a d 0.55 >1 mm 0.66 0.1-1 mm 0.77 <0.1 mm

    Settling Velocity = (Stokes) Vs = 0.03597 m/s

    (here R is particle size, i.e. d)

    (here R is particle size, i.e. d)

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