A surface water treatment plant designed to process 70,000 m3/d al a water temperature of 10° C has a four-compartment flocculation tank with a total length of 25 m, width of 12 nr, and water depth of 5.0 m. The paddle flocculator in each of the four chambers between baffles has 4 blades, each 25 cm wide and 11.5 m long with the center line of the paddles at a radius of 1.8 m. Assume the velocity of the water is 30% of the paddle velocity and the drag coefficient is 1.8. At a rotational speed of 2.0 rpm, calculate the velocity gradient.
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