Hydraulic conductivity (Falling-head method)


Hydraulic conductivity is a property of vascular plants, soils and rocks, that describes the ease with which a fluid (usually water) can move through pore spaces or fractures. It depends on the intrinsic permeability of the material and on the degree of saturation, and on the density and viscosity of the fluid. The falling-head method is a laboratory method to determine the hydraulic conductivity of a soil. The advantage to the falling-head method is that it can be used for both fine-grained and coarse-grained soils. The soil sample is first saturated under a specific head condition. The water is then allowed to flow through the soil without maintaining a constant pressure head.

Related formulas


KHydraulic conductivity (cm/sec)
aThe cross section of the standpipe (cm2)
LLength of speciment (cm)
AArea of speciment (cm2)
tTime required for the water to be discharged (sec)
h1Upper water level (cm)
h2Lower water level (cm)