Equivalent depth of earth return path

Definition according to Cigré guide 531 chapter 4.2.3.3. The equivalent depth of the earth return path of a 50 Hz system with an electric soil resistivity of 100 $\Omega$.m is about 930 m.

Symbol
$L_{earth}$
Unit
mm
Formulae
$\frac{2e^{0.5}}{\gamma_{bessel} \sqrt{\frac{\omega \mu_0}{\rho_{earth}}}}$
Related
$\gamma_{bessel}$
$\mu_0$
$\omega$
$\rho_{earth}$