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<br />Lesson 2 <br /> <br />Basic Hydraulics - Participant Workbook <br /> <br />WEIR EQUATION <br /> <br />ORIFICES <br /> <br />. DISCHARGE ACROSS A WEIR: <br /> <br />. ORIFICE IS AN OPENING WITH A <br />REGULAR SHAPE <br /> <br />Q = CD L H 312 <br /> <br />. WHEN FLOWING PART FULL IT <br />BECOMES A WEIR <br /> <br />2.16 Weir Equation <br /> <br />2.17 Orifices <br /> <br />B. An orifice is an opening with a regular shape (circular, square or rectangular) <br />through which water flows in contact with the total perimeter. <br /> <br />. if the opening is flowing only partially full, the orifice becomes a weir <br />. an orifice with a sharp upstream edge is called a sharp-crested weir <br /> <br /> <br />ORIFICE EQUATION <br /> <br />. DISCHARGE THROUGH AN ORIFICE: <br /> <br />Q = CDAJ2g ~H <br /> <br />2.18 Orifice Diagram <br /> <br />2.19 Orifice Equation <br /> <br />the discharge through an orifice is: <br /> <br />Q = CDAJ2g ~H <br /> <br />2-10 <br /> <br />where: Q = Discharge (cfs) <br /> CD = Coefficient of discharge for orifices <br /> A = Area of the orifice (ft2) <br /> g = Acceleration of gravity (32.2 lVs2) <br /> L'.H = Difference in head across the orifice (ft) <br /> <br />2-12 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />! <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />