### The unit coefficient of permeability is ______

### If the discharge velocity is 4*10¯?cm/s and the porosity is 33%, then the seepage velocity will be _______

**Options**

A : a. 18*10¯?cm/s

B : b. 12*10¯?cm/s

C : c. 6*10¯?cm/s

D : d. 3*10¯?cm/s

### If the soil has discharge velocity is 9*10¯?cm/s and the voids ratio of 0.5, then the seepage velocity will be _______

**Options**

A : a. 18*10¯?cm/s

B : b. 27*10¯?cm/s

C : c. 16*10¯?cm/s

D : d. 13*10¯?cm/s

### The velocity of flow is proportional to _________ according to Darcy’s law.

**Options**

A : a. effective stress

B : b. hydraulic gradient

C : c. cohesion

D : d. adhesion