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
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 reduced.
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 conservation equations.
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 itself.
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 the Alterra-ILRI
download page View here the table of contents. Contact
Kselik at ILRI for a copy of Satem software.
reports & cases
reports & cases
Figure screen of WellDrain program
Example of results