A masonry or concrete wall built perpendicular (90°) to the weir axis to separate the main weir from under-sluices is called ____________________?
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Answer: A. Divide wall
Explanation
A divide wall is constructed perpendicular to the weir axis to separate the main weir from under-sluices. This structural wall prevents cross-flows and maintains distinct operational zones for water diversion. It helps create a quiet pocket in front of canal head regulators to facilitate effective sediment scouring. River diversion headworks require specialized training walls to direct flow and control sediment movement. Divide walls are typically built of reinforced concrete or masonry extending above maximum flood levels. Their alignment ensures smooth flow transitions between the river channel and off-taking canal regulators.
Civil engineers include divide walls in barrage and weir designs to protect canal intakes from heavy turbulence. It matters because poor flow separation can cause uncontrolled sediment entry and damage head regulators. Hydraulic model studies help determine the optimal length and height of divide walls for specific rivers. Option B supports earth slopes against sliding rather than separating weir bays from under-sluices. Option C provides low retaining support at the base of dam walls rather than dividing main weir sections. Option D is incorrect because only option A correctly names this specific perpendicular divider wall.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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