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Water at 10°C flows from a large reservoir to a smaller one through a 4-cm- diameter cast iron piping system, as shown in the figure. Determine the elevation zi for a flow rate of 7 L/s. ? 1 Sharp-edged entrance D = 4 cm 15 m -Control volume boundary -Standard elbow, flanged, 100 m Gate valve, fully open 2 = 10 m -Exit