Drainage equations for depth and spacing of
subsurface drains aiming at watertable (water table)
and soil salinity control in irrigated agricultural
Free download of software
The EnDrain computer program calculates the
drainage discharge, hydraulic head, or spacing
between parallel subsurface (sub-surface) drains:
pipe/tile drains or open ditches, with or without
entrance resistance and shows the curve of the
The computations are needed
for the design of subsurface drainage systems
of rainfed or irrigated agricultural land for
waterlogging (water logging), watertable
(water table) and soil salinity control.
EnDrain can be used for the
reclamation (remediation, rehabilitation,
restoration) of saline (salty) soils.
The simulation software is free for download. It
can be called shareware (freeware) and is in public
The drain spacing calculations are based on the
concept of the energy balance of groundwater
(ground-water) flow. However, the traditional
concepts based on the Darcy and waterbalance
(water balance, budget) or mass conservation
equations are also used.
The program allows for the
presence of three different soil layers with
different hydraulic conductivity and permeability:
one layer above and two below drain level. The
last two layers can also have different
horizontal and vertical hydraulic conductivity or
Examples are given.
On 21 May 2012 the auxiliary Fortran programs of
the EnDrain model were eliminated and the
contents were integrated into the Delphi program.
The program starts clicking on EnDrain.Exe.
More information is given in the program itself.
On 10 August 2010 the program was improved thanks
to comments of Nicolas Deeks.
On 14 June 2011 the user interface was improved
thanks to a request of Robin Johnston.
On 17 May 2012 the EnDrain program was improved
thanks to suggestions by Pepe del Monte.
Publications on the physical and mathematical
theory of the energy balance of groundwater
(ground-water) flow and examples of EnDrain
applications are found on the
articles page or
directly as PDF
reports & cases
reports & cases
Figure screen of EnDrain program
Example of results