Spacing of wells (vertical drains) in subsurface
drainage systems for watertable (water table) and soil
salinity control in irrigated agricultural lands
Totally free download and use of software
The WellDrain computer program calculates the
drainage discharge by wells, hydraulic head,
hydraulic conductivity, or spacing between
pumped wells (open dug wells, tubewells,
vertical drainage) and shows the curvature of
the watertable (water-table).
The computations are needed for the design of
subsurface drainage systems by open wells or
tube-wells of rainfed or irrigated agricultural
land and soil salinity control. The wells may be
partially or fully penetrating the aquifer.
On 10 August 2010 the program was improved
thanks to comments of Nicolas Deeks.
On 13 June 2011 the program was expanded to
include a rectangular layout of the well field
under the option "Calculate hydraulic head",
thanks to questions asked by Michael Conley.
On 11 August 2012 the WellDrain software was
completely integrated under Delphi, so that the
auxiliary *.exe files in Fortran were no longer
required and the program size was considerably
On 23 November 2012 the facility to calculate
the hydraulic conductivity was included, so that
the program can be used for evaluation of a
pumping test, well test, or aquifer test.
On 4 February 2014 the titels of the data to be
entered in the input tabsheet have been improved
thanks to feed back by Malcolm Woodruff.
The well spacing calculations are based on the
traditional concepts of the Darcy and
waterbalance (water balance, budget) or mass
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 permeability
(anisotropy). Examples are given.
WellDrain can be used in case of waterlogging
(water logging) and for the reclamation
(remediation, rehabilitation, restoration) of
saline (salty) soils.
The simulation software is totally free for
download and use. It can be called shareware
(freeware) and is in public domain.
The program starts clicking on WellDrain.Exe.
More information is found in the program
A description of the physical, numerical and
mathematical theory of groundwater
(ground-water) flow to pumped drainage wells
and vertical drainage can be
For the determination of hydraulic aquifer
properties from pumping tests by wells
one may consult the publication "Software for
Aquifer Test Evaluation, SATEM" by
J.Boonstra and R.A.L.Kselik. For free download
of the scanned publication in PDF format go to
download page View here the
table of contents.
ILRI for a copy of Satem software.
reports & cases
reports & cases
Screenprint of figure in WellDrain program
Example of results of WellDrain model