The constant head

permeability method is commonly used to find soils with high liquid discharge

capacity.

The constant head

permeability test can be performed only for undisturbed soil samples.

The difference in

water levels between the two manometers reflects the difference in total energy

at those respective levels in the constant head permeability test.

Answer :b

The soil sample is

saturated before commencing the test in the constant head permeability test.