Design of Raised Weir and Under Sluice

DESIGN OF RAISED WEIR AND UNDER SLUICE
1 DATA
Design Flood Q 1095 m3/s
Average bed level of river 3012 m
Maximum water level 3022 m
Full Reservoir level 3020 m
Crest level of under sluice 3012 m
No of Bays in under sluice(Assumed) 6 Nos
Width of each bay in undersluice 6m
Height of undersluice D 10 m
Bottom level of breast wall 3022 m
Thickness of mid peir 2.5 m
No of Divide walls in undersluice 4 Nos
Centre pier width 4
Width of abutment 2m
Free board 1.5 m
Total Width of diversion structure 54.00 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 159.83 m
No of Bays of sluice 6 Nos
Width of one sluice 6m
Total width of sluices 36 m
Total width of water way 36 m
Crest level of sluice 3012 m
Average discharge intensity 30.42 m3/s
Scour depth 13.32 m
Velocity approach 2.28 m/s
Velocityhead 0.27 m
Total effective level 3021.27 m
3 Check for water way

ii)Head over sluices
Head over sluice bays 10.00 m
Design head 9.00 m
H2/Hd 1.11
Head over centre line of the sluice 5.00 m
Top level of the structure 6.50 m
H/D Ratio 0.50
Flow type Gravity flow
iv)Discharge through sluices

Cb 0.83
Width of bay 6
Depth of bay 10
Discharge Q2 2955.91 m3/s
Total discharge 2955.91 m3/s

Loseness factor 0.23
Discharge with out contraction 20.46 m3/s
y1 10.00 m
v1 14.01 m/s
F 1.41
y2 15.62 m
Lost in energy in jump 0.28 m
vi)Cutoff walls bottom levels Sluice

Total discharge throgh weir 2955.91 m3/s
Overall water way of weir 54.00 m
Average discharge intensity 54.74 m3/s/m
Scour depth R 19.70 m
u/s cutoff
Depth of scour hole 19.70 m
RL of bottom of scour hole 3003.00 m
Provide upstream cutoff up to the elevation of 3003m.
D/s cutoff
downstream HFL 3023.62 m
Depth of scour hole 24.63 m
RL of bottom of scour hole 2999.00 m
Provide d/s stream cutoff up to the elevation of 2999m.
vii) Design of impervious floor For Downstream side of under sluice

Slope 1in 3
Tann 0.33
From graph L j/Y2 5.2
Jump length Lj 82.00 m
sum of sloping and horizontal apron L 57.40 m
Length of Left sloping portion 12.00 m
Length of Right sloping portion 3.00 m
Length of straight portion 42.40 m
Thickness of apron 3.95 m
Invert level of Down stream apron 3008 m
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 5m
Slope 1 in 2
viii) Design of impervious floor For Upstream side of under sluice

Width of conc. Block protection 19.70 m
Thickness 0.90 m
Use Concrete blocks For 19.7m over packed with Gravel through out the width
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 3024 m
Height for remaining length of apron 3025 m
Floor design by khosla's theory

Exit gradient
a)For undersluice
GE 0.25
1/(π√λ) 0.16
; 5.00
Floor thickness
a)For undersluice
1/; 0.20
ΦE 40 %
ΦD 27 %
ΦD1 73 %
Φc1 60 %
D 12.10 m
d 9.00 m
b 101.70 m
Correction for Upstream cutoff
a)Correction due to Effect of cutoffwalls
C 1.36 %
b)Correction For depth
C 1.44 %
c) Correction for slope
Φc1 Corrceted 62.80 %
Corrected depth of cutoff wall 14.65 m
Correction for Downstream cutoff

d 9.00 m
1/; 0.20
ΦE 40 %
ΦD 27 %
ΦD1 73 %
Φc1 60 %
ΦE -ΦD 13 %
Correction for depth 5.71 %
Corrected depth of cutoff wall 8.50 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"
14 m
28 1.70 m
41.5 2.30 m
Thickness of downstream floor

At 4m From d.s end
Unbalanced head 0.00 m
Required floor thickness 0.00 m
Provide floor thickness as 0.8 m
At 8m From d.s end
Provide floor thickness as 1.4 m
At 11m From d.s end
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
width
est

Design of Raised Weir and Under Sluice

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DESIGN OF RAISED WEIR AND UNDER SLUICE

2 Fixation of waterway and crest levels

3 Check for water way

iv)Discharge through sluices

Total discharge 2955.91 m3/s

vi)Cutoff walls bottom levels Sluice

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

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

Floor design by khosla's theory

Correction for Downstream cutoff

Thickness of downstream floor

Thickness of upstream floor

Thickness of sloping portion

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