PolySalt is designed to simulate
the depth of the water table, the soil salinity and
the groundwater flow in irrigated areas with a
monthly time step, using a polygonal network.
It allows the introduction of a subsurface drainage
system in a transition zone between root zone and
aquifer, and subsequently it determines the drain
When the irrigation/rainfall is scarce and the water
table is shallow, PolySalt will calculate the
capillary rise and reduce the potential
evapotranspiration to an actual evapotranspiration,
although the reduction may diminished by the
The model can also take into account upward seepage
from the aquifer or downward flow into it. The
latter is also called natural subsurface
PolySalt can be used when field observations of
irrigation, water table and soil salinity have been
made and one wishes to develop a model for that
situation. Normally, calibration of unknown values
must be done using a range of values of the
corresponding variable, running the model repeatedly
and selecting the optimal value from the range that
gives model results closest to observed values.
This model is a condensed form of SahysMod. 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 runs
monthly instead of seasonally. After each month,
the program gives the user the opportunuity to
change input data before it continuous calculations
for the next month.
Upon request a version with a different time step
(e.g. a week) can be made available.
Start: The program starts clicking on
More information is given in the program itself.
(to be completed)