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Abstract
Theory of flow discharge through large orifice on wall is obtained by integration of small orifice equation dQ on flow column dA. The flow equation obtained from integration process contains fractional exponent number, moreover the obtained equation is not simple for practical purpose. The application of the obtained equation can raise an error. This research presents practical discharge concept as a result of multiplication of orifice broad (A) and flow velocity (V) at the centre of orifice. Application of practical discharge equation on rectange orifice, triangle orifice, trapezoidal orifice, and circle orifice show maximum error presentation less than 5% toward theoretical discharge.
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