How to do 4.3 to get the answer provided?

4.3 A rectangular horizontal flow sedimentation tank is designed to treat 1,800 m/day of wastewater. The tank aims to remove suspended solids of density 2,800 kg/m with an overflow velocity limited to 24 m/m2.day and weir loading of 100 m /m.day. The density of the wastewater is 1,000 kg/m and its viscosity is 0.001 Pa.s. (a) If the length to width ratio for the tank is 4:1, determine the dimensions of the tank. (3 marks) (b) Determine the minimum weir length required for the tank. (2 marks) Determine the settling velocity of a 0.18 mm diameter suspended solid particle. (5 marks) (c) (d) Explain if the tank is able to settle and remove suspended solids of diameter 0.18 mm and above. (2 marks) 4.3(a) L = 17.3 m, W = 4.3 m 4.3(b) Lw = 18 m 4.3(c) Vs = 0.0318 m/s s