Hi! I would like some help with my water treatment homework, please..

Consider the particle shown below with the values in the table (to be selected by the instructor). Calculate the overflow rate that corresponds to the setting velocity of the particle on the trajectory shown (report your answers in m/h and gpm/ft2). If it is desired to achieve complete removal of particles of this size, what adjustment in the length of the basin would be required?

We need to solve for parameter A

Particle Vi b C Vs a Parameter B D E Fluid velocity, cm/s Dimension a, m Dimension b, m Dimension c, m 20 4 0.6 0.9 1.4 100 3.5 4.2 0.5 72 1.7 3.5 1 80 0.85 1 0.28 30 3.6 4.2