A rectangular weir is a structure placed across an open channel to measure or control the flow of water. It consists of a vertical plate with a rectangular opening over which water flows. The amount of water flowing, known as the flow rate (Q), over a rectangular weir is directly related to the water depth (H) above the weir crest. The weir crest is the bottom edge of the rectangular opening over which the water passes. This relationship is defined by the weir formula, which, in its simplified form for a rectangular weir, states that the flow rate is proportional to the weir length (L) an....
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