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To figure out weir overflow, you need to calculate the flow rate over the weir using the weir formula, which typically involves the weir height, the weir length, and the gravitational constant. The most common formula is ( Q = C_d \cdot L \cdot H^{3/2} ), where ( Q ) is the flow rate, ( C_d ) is the discharge coefficient, ( L ) is the length of the weir, and ( H ) is the head of water above the weir. Measure the water level accurately and ensure the weir is properly calibrated for precise results. Additionally, consider factors like turbulence and approach flow conditions for more accurate assessments.

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