What is the difference between flux and permeability?
Flux is the actual rate of flow through the GCL and is expressed in units of volume per unit area per unit time (m3/m2/sec). Permeability or hydraulic conductivity is a mathematical constant derived from Darcy’s Law and describes a soil’s ability to convey flow under known hydraulic forces. The benefit of using flux is that this value can be used for a direct comparison to any maximum leakage specifications or requirements for a given project. TR-317 provides a complete description of these concepts.
