For the purpose of designing a well point system for lowering ground water table in a sandy silt deposit, the coefficient of permeability of the soil is to be determined. Which one of the following methods would be most suitable ?

For the purpose of designing a well point system for lowering ground w

1.	For the purpose of designing a well point system for lowering ground water table in a sandy silt deposit, the coefficient of permeability of the soil is to be determined. Which one of the following methods would be most suitable ?
A.	Constant Head Permeameter Test
B.	Variable Head Permeameter Test
C.	Pumping out Test in the field
D.	Pumping in Test in the field
Answer» D. Pumping in Test in the field