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    Barrage and Weir

    Uploaded by

    Gokul
    This document provides design details for a raised weir and under sluice structure, including calculations for the waterway, crest levels, discharge, and structural elements like cutoff walls, floors, and blocks. Key parameters specified are a design flood of 1244 cubic meters per second, 7 bay undersluice with 4 meter widths, and calculations to determine appropriate dimensions to pass design flows while ensuring stability.

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    © All Rights Reserved
    Download as XLSX, PDF, TXT or read online from Scribd

    Barrage and Weir

    Uploaded by

    Gokul
    49 views10 pages
    This document provides design details for a raised weir and under sluice structure, including calculations for the waterway, crest levels, discharge, and structural elements like cutoff walls, floors, and blocks. Key parameters specified are a design flood of 1244 cubic meters per second, 7 bay undersluice with 4 meter widths, and calculations to determine appropriate dimensions to pass design flows while ensuring stability.

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    This document provides design details for a raised weir and under sluice structure, including calculations for the waterway, crest levels, discharge, and structural elements like cutoff walls, floors, and blocks. Key parameters specified are a design flood of 1244 cubic meters per second, 7 bay undersluice with 4 meter widths, and calculations to determine appropriate dimensions to pass design flows while ensuring stability.

    Copyright:

    © All Rights Reserved
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
    49 views10 pages

    Barrage and Weir

    Uploaded by

    Gokul
    This document provides design details for a raised weir and under sluice structure, including calculations for the waterway, crest levels, discharge, and structural elements like cutoff walls, floors, and blocks. Key parameters specified are a design flood of 1244 cubic meters per second, 7 bay undersluice with 4 meter widths, and calculations to determine appropriate dimensions to pass design flows while ensuring stability.

    Copyright:

    © All Rights Reserved
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
    of 10

    DESIGN OF RAISED WEIR AND UNDER SLUICE

    1 DATA
    Design Flood Q 1244 m3/s
    Average bed level of river 3133 m
    Maximum water level 3144 m
    Full Reservoir level 3144 m
    Crest level of under sluice 3133 m
    No of Bays in under sluice(Assumed) 7 Nos
    Width of each bay in undersluice 4m
    Height of undersluice D 5.2 m
    Bottom level of breast wall 3138.2 m
    Thickness of mid peir 2.5 m
    No of Divide walls in undersluice 6 Nos
    Width of abutment 2m
    Free board 1.5 m
    Total Width of diversion structure 47.00 m
    Allowable afflux 1m
    Particle size of sediment 0.3 mm
    Lacy's Silt factor 0.96
    Type of soil Shingle

    2 Fixation of waterway and crest levels


    Minimum stable waterway Pw 170.36 m
    No of Bays of sluice 7 Nos
    Width of one sluice 4m
    Total width of sluices 28 m
    Total width of water way #REF! m
    Crest level of sluice 3133 m
    Average discharge intensity #REF! m3/s
    Scour depth #REF! m
    Velocity approach #REF! m/s
    Velocityhead #REF! m
    Total effective level #REF! m

    3 Check for water way


    ii)Head over sluices
    Head over sluice bays 11.00 m
    Design head 9.90 m
    H2/Hd 1.11
    Head over centre line of the sluice 8.40 m
    Top level of the structure #REF! m
    H/D Ratio 1.62
    Flow type Pressure flow

    iv)Discharge through sluices


    Cb #REF!
    Width of bay 4
    Depth of bay 5.2
    Discharge Q2 #REF! m3/s

    Total discharge #REF! m3/s


    Loseness factor #REF!
    Discharge with out contraction #REF! m3/s
    y1 #REF! m
    v1 #REF! m/s
    F #REF!
    y2 #REF! m
    Lost in energy in jump #REF! m

    vi)Cutoff walls bottom levels Sluice


    Total discharge throgh weir #REF!
    Overall water way of weir 28
    Average discharge intensity #REF!
    Scour depth R #REF!

    u/s cutoff
    Depth of scour hole #REF!
    RL of bottom of scour hole #REF!
    Provide upstream cutoff up to the elevation of m.
    D/s cutoff
    downstream HFL #REF!
    Depth of scour hole #REF!
    RL of bottom of scour hole #REF!
    Provide d/s stream cutoff up to the elevation of m.

    vii) Design of impervious floor For Downstream side of under sluice


    Slope 1in 3
    Tann 0.33
    From graph L j/Y2 6
    Jump length Lj #REF! m
    sum of sloping and horizontal apron L #REF! m
    Length of Left sloping portion 9.00 m
    Length of Right sloping portion 3.00 m
    Length of straight portion #REF! m
    Thickness of apron #REF! m
    Invert level of Down stream apron #REF! m
    Chute Blocks
    Height and top width of blocks #REF! m
    Breadth at the elevation #REF! m
    Clear spacing between blocks #REF! m
    End sill
    Height of rised sill #REF! m
    Clear spacing of dents in sill #REF! m
    Concrete blocks
    Size of blocks 1.5mx1.5mx0.9m

    Use Concrete blocks of size 1.5mx1.5mx0.9m For 2 rows packed with Gravel through out the width

    Down stream toe wall


    Provide 0.5m thick toe wall with bottom 1.3m width over a 0.15m thick pcc layer
    Launching apron
    Thickness of apron(assumed) 0.75 m
    Beginning thickness of stone 0.6 m
    Length of apon to be provided 0m
    Slope 1 in 2

    viii) Design of impervious floor For Upstream side of under sluice


    Width of conc. Block protection #REF! m
    Thickness 0.90 m

    #REF!

    Provide launching apron of 0.75m thick with stone pitching at a slope 2:1.
    Abutments And mid piers
    No. of abutments 2 Nos
    No. of mid piers 1 No
    No. of Dividing walls 1 No
    Height for 15m from vertical face of weir to d/s 3146 m
    Height for remaining length of apron 2m

    Floor design by khosla's theory


    Exit gradient
    a)For undersluice
    GE 0.25
    1/(π√λ) #REF!
    ; 5.00

    Floor thickness
    a)For undersluice
    1/; 0.20
    ΦE 40 %
    ΦD 27 %
    ΦD1 73 %
    Φc1 60 %
    D #REF! m
    d 3133.00 m
    d1 3133.00 m
    b #REF! m
    Correction for Upstream cutoff
    a)Correction due to Effect of cutoffwalls
    C #REF! %
    b)Correction For depth
    C 0.004149 %
    c) Correction for slope
    Φc1 Corrceted #REF! %
    Corrected depth of cutoff wall #REF! m

    Correction for Downstream cutoff


    d #REF! m
    1/; 0.20
    ΦE 40 %
    ΦD 27 %
    ΦD1 73 %
    Φc1 60 %
    ΦE -ΦD 13 %
    Correction for depth #REF! %
    Corrected depth of cutoff wall #REF! m
    Density of concrete 2.24 kg/m3
    Submerged density of concrete 1.24 kg/m4
    Un balanced heads From D/s cutoff wall in "m"
    4 0.89 m
    8 1.70 m
    11 2.30 m

    Thickness of downstream floor


    At 4m From d.s end
    Unbalanced head 0.89 m
    Required floor thickness 0.72 m
    Provide floor thickness as 0.8 m
    At 8m From d.s end
    Unbalanced head 1.70 m
    Required floor thickness 1.37 m
    Provide floor thickness as 1.4 m
    At 11m From d.s end
    Unbalanced head 2.30 m
    Required floor thickness 1.85 m
    Provide floor thickness as 2m

    Thickness of upstream floor


    provide thickness of floor as 0.9 m
    Under the crest thicken the floor for 1.5m in a length of 2m Under the crest

    Thickness of sloping portion


    Provide varying thickness of
    At top 1.5 m
    At bottom 2.75 m
    Sluice
    m3/s
    m
    m3/s
    m

    m
    m

    m
    m
    m
    vel through out the width
    est

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