If the settling velocity of a particle is 0.30 cm/s and the overflow rate of a horizontal flow clarifier is 0.25 cm/s.

a. what percent of the particles are retained in the clarifier?

b. if the flow rate is doubled, what percent removal of particles would be expected?

c. if a 1.0-m/s flow water treatment plant uses 10 sedimentation basins with an overflow rate of 15 m3/d*m? . what should be the surface area (mº) of each tank?