Tasks on hydraulics miscellaneous 9

For tubing having a constriction, the water flows with flow rate Q (Fig. 3.16). To determine the diameter d2 should have the narrow part of the duct to provide a suction of water from the reservoir to a height h, if d1 and R1. The source data Q = 12 dm3/s h = 3mm d1 =90 mm P1 = 40 kPa