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THEORY Open channel flow nowadays such as role of life. It is very important which water as the basic need for human. For example, water flowing in rivers and streams must be supply to residential and industrial uses [1]. In agriculture, as a farmer, the uses of water is hugely use to watering the plants. The analysis of water flow over a sharp crested weir is at best a exceedingly complex problem. Therefore, there are the assumptions in order to solve the problem. It will be assumed that [2]: The fluid is incompressible The fluid friction is negligible. The flow is irrotational. The flow is steady and two-dimensional. The fluid velocity upstream of the weir very small relative to the velocity of the water passing over the weir and can be neglected. The general equation to calculate the flow rate [3]: Q=CdLH n Where, Q = flow rate Cd = coefficient of discharge L = length of weir over which water flows H = depth of water (head) n = an empirical exponent
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