The thickness of the layer below the drain pipes and above a vertical impermeable horizon. Used for calculation of the equivalent layer thickness in the Hooghoudt formula.
Note that the Dlayer is normally smaller than the DrainSpacing/4.
Default
Unit
Symbol
Equation
Function
4
m
zD
(2.41) (2.44)
(2.45)(2.46)
(2.48)(2.49)