What is the designated top edge over which water flows in a weir structure known as_____________________?
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Answer: C. sill
Explanation
The top edge or threshold of a weir structure over which liquid flows is called the crest or sill. Water spilling over this structural threshold forms the downstream nappe profile used in flow measurement calculations. Accurate leveling of the weir sill ensures consistent hydraulic discharge coefficients across the structure. Weirs are hydraulic engineering structures constructed across open channels to measure and control water flow rates. The crest geometry dictates the relationship between upstream water head and volumetric discharge passing downstream. Sharp-crested weirs provide precise flow measurement capabilities in laboratory flumes and irrigation canals.
Option B refers to the nappe, which is the sheet of water overflowing the weir crest rather than the edge itself. Option D uses an informal term instead of the standard hydraulic engineering designation of crest or sill. Option E denotes vena contracta, which describes fluid jet contraction downstream of an orifice restriction.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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