Value

Meaning

off

No drainage is calculated to a ditch or a drain tile.

Linear Model

A simple linear model is used to calculate the drainage if the ground water table is above a certain layer. Fluxes are only assigned to layers above the drainage level.

Ernst Model

The drainage equation by Ernst is used to account for resistances caused by the radial and horizontal flows to the drainage system.

Hooghoudt Model

Similar as above but the classical Hooghoudt equation is used instead.