LeachMod is designed to
simulate the depth of the water table and the
soil salinity in irrigated areas with a time step
as selected by the user (from 1 day to 1 year). The
program uses small time steps in its calculations
anyway for a better accuracy.
In case of a leaching experiment with measured soil
salinities, LeachMod can automatically optimize
the leaching efficiency by minimizing the sum of
the squares of the differences between measured and
The root zone can consist of 1, 2, or 3 layers.
LeachMod allows the introduction of a subsurface
drainage system in a transition zone between root
zone and aquifer, and subsequently it determines
the drain discharge.
When the irrigation/rainfall is scarce and the
water table is shallow, LeachMod will calculate the
capillary rise and reduce the potential
evapotranspiration to an actual evapotranspiration
that, although the reduction may diminish by the
LeachMod can also take into account upward seepage
from the aquifer or downward flow into it. The
latter flow is also called natural subsurface
This model is somewhat similar to
On the one hand the water management options are
fewer (e.g. re-use of drainage or well water for
irrigation do not feature here), but the model is
more modern in the sense that the variable input
for each time step is given in a table so that the
calculations over all the time steps are done in
one go. Moreover, by inserting the observed values
of soil salinity in the data table, the model
optimizes the leaching efficiency of the soil
The program starts clicking on LeachMod.Exe.
More information is given in the program itself.
(to be completed)