5. Find the critical settling velocity for a crossflow lamella clarifier (see given Figure) that has lamellae spaced at 6 cm (perpendicular distance between the lamellae) intervals. The lamellae are inclined at an angle of 60. The volumetric flow rate into the clarifier is 1200 m/h and the clarifier cross-sectional area receiving the influent flow is 8 m. The vertical depth of the lamellae is 2.0 m. The length of the clarifier is 20 m. How advantageous is the lamella clarifier over a conventional clarifier of the same dimensions?