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The Wierl equation, also known as the Weir equation, is derived from the principle of conservation of mass and energy in fluid mechanics. It is commonly used to calculate the flow rate of liquid over a weir or dam structure. The equation takes into account the height of the liquid above the weir crest, the characteristics of the weir (such as its shape and length), and gravitational acceleration. By applying Bernoulli's equation and the concept of head loss, the Wierl equation can be derived to accurately predict the flow rate in such hydraulic structures.

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