Head

pore water pressure.

pressure head

Elevation head (z)

Piezometer

Total head

i=

k=

v=

Darcy's Law

the quantity of water flowing through the soil in unit time

gamma(w) =

Factors affect permeability of soil

Constant head permeability test is

Falling head permeability test is

Phreatic zone:

Aquifer:

Aquicludes:

Aquitards:

Unconfined aquifer:

Confined aquifer:

Field Instrumentations

Essential Points