Attributes:

LKFA [-] (node or polyline wise),

LEFA [-] (element wise, only horizontal and 3D models)

For the accurate mapping of leakage boundary conditions, the ratio between ex- and infiltration coefficients can be defined at nodes (or polylines) and elements with defined leakage values:

At nodes and polyline:

exfiltration coefficient / infiltration coefficient = LKFA, (here the exfiltration coefficient is LERA or LEKN)

On Elements:

exfiltration coefficient / infiltration coefficient = LEFA, (here the exfiltration coefficient is LEEL)