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Table 1: The structural dimensions of barrage and rehabilitation scenarios.

Description Barrage Subsidiary weir Stone at stable slope Two step stilling basin
At 800ft At 600ft
U/S floor (ft) Concrete 20 40 40 Stone apron at the slope of 1:15 up to anticipated retroregression level (EL662) for a length of 140 21.5
Block 11 20 20 12.5
Stone Apron 25 25 25 26
Sloping portion 61 69 62.75
D/S floor (ft) Concrete 70 95 95 69.75
Block 60.58 43.5 43.5 41
Stone apron 40 45 45 40
Sheet pile 1 3 3 2
Width across river 3353 3913 3913 2520
Divide wall (ft) About 800
Mechanical gates 54 in front of left undersluices
Navigation Bay 1 1 1
Fish ladder 2 2 2
Sluice way (ft) 495 495 495
Guide banks (ft) about 1200 about 800
Pressure pipes yes yes yes yes
Cofferdam yes yes can be avoided yes