Agricultural Waterlogging, Soil Salinity, Field Irrigation, Plant Growth, Subsurface Drainage, Groundwater Modelling, Surface Runoff, Land Reclamation, and other Crop Production and Water Management Issues in Agriculture.
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The purpose of this web site is to share my experiences with workers in any country on waterlogging in agricultural lands, irrigation induced soil salinization (salination), subsurface drainage for agriculture (horizontal and vertical), reuse of groundwater hydraulics, (geo)hydrology, rainfall and surface runoff relations, reclamation and improvement of waterlogged saline (salty), sodic alkaline, and acid sulphate soils, plant growth, crop production and responses as well as statistical analysis consisting of segmented linear regression and fitting of cumulative probability distributions.
As a land and watermanagement specialist at the International Institute for Land Reclamation and Improvement (ILRI), Wageningen, The Netherlands, I have worked since 1965 in almost 30 countries in Asia, Africa and Latin America, giving training courses, participating in research programs and providing project advice as a consultant. In 2002, I left ILRI to be independent.
When you wish to communicate with the author, please use the contact form.
Languages: Dutch, English and Spanish. Messages in French, German or Portuguese will be understood but replied in English or Spanish.
& models
  General articles
& manuals
(in Spanish,
  en Español)
reports & cases
reports & cases

  What is offered?
Pages with software,
articles and FAQ's
arranged by subject :

drainage subjects
ground water
& aquifers

irrigation subjects
tidal/spate irrigation

soil subjects
salinity, alkalinity
& sulfate acidity

statistical subjects
cumulative frequency
& segmented regression
Free downloads of software
The site gives free download opportunity of software and models freeware and computer programs (tools I developed because of need in my work).
       The programs relate to statistics (segmented linear regression with break-point, cumulative probability distribution fitting and recurrence predictions), groundwater flow to subsurface drains (horizontal/tile drainage) and pumped tubewells (vertical drainage), rainfall-surface runoff relations simulated with a nonlinear reservoir, and agro-hydro-salinity simulation models including groundwater hydraulics in unconfined and semiconfined aquifers.
       The source code of the software can be seen at the open source page.

Free downloads of general articles
The site offers free downloading of general articles and manuals in the field of waterlogging, agricultural land drainage for soil desalination (desalinization), salty soils, and subsurface drainage for agriculture (horizontal and vertical).
       In addition one can find here supporting papers on the software referring to land reclamation (rehabilitation) of waterlogged land, and the remediation (restoration) of salt affected, saline, soils. The same holds for the models on statistical analysis, segmented linear regression of plant growth, crop production and yield responses, as well as cumulative frequency distributions of hydrologic factors.

Reports and case studies, free download
A list of project evaluations and case studies on water-management, agricultural land drainage, irrigation, drainage for salinity control in agriculture for remediation of soil salination (salinisation) can be found on the published reports page and on the particular reports page.
       The same holds for reclamation, rehabilitation, restoration and improvement of salty, saline, alkaline and acid sulphate/sulfate soils.

I intend to update and expand this website regularly and include update reports.

Land reclamation

Land improvement
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