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Diameter of drying zone

This is the diameter around a source where the soil has dried out. The equation originates from the book 'Kabel und Leitungen für Starkstrom' by L. Heinhold, 5th edition 1999 (in German).

Symbol
$D_{dry}$
Unit
m
Formulae
$\frac{4\left(L_{cm}-d_{psc}\right) g_{dry}}{{g_{dry}}^2-1}$
Related
$d_{psc}$
Point source correction [m]
$g_{dry}$
Geometric constant of circle with dried-out soil [p.u.]
$L_{cm}$
Depth of laying [m]