The average daily demand at a town has been estimated as 8 million liters per day. Design a suitable sedimentation tank, assuming a detention period of 5 hours and velocity of flow as 22 cm per minute.

The hydraulic conductivity (K) of a homogeneous clay/sand mix aquifer is   2x10-4  cm/sec.   The hydraulic gradient (groundwater surface slope) of the phreatic (water table) aquifer is 0.08 and the aquifer's effective porosity is 0.25.   Calculate the average velocity of a conservative contaminant discharged to this groundwater unit. Enter your answer rounded to the nearest tenth  in meters/year.  Example:   5.2 ,  65.7,   224.3   would all be proper forms of your answer

A rectangular settling tank is to treat 3.6MLD of raw water. The sedimentation period is to be 3 hours; the velocity of flow is 10 cm/min. The cross sectional area of the basin (in m², round off to the nearest integer) is

Determine the minimum dimension of a particle that can be completely removed from a settling chamber, if the rate of overflow is 30 m3/d/m2. Take specific gravity of particle equal to 2.65 and the dynamic viscosity equal to 1 x 10-5 Ns /m2.