Purpose
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.
History
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.
The software I am offering was developed because
I needed it for my work and in that time internet
did not yet exist. The initial software was
programmed with Fortran, later is was modernized
with user interfaces using Delphi.
Contact
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.
Software
& models
General articles
& manuals
Artículos
(in Spanish,
en Español)
Published
reports & cases
Particular
reports & cases
Frequently
asked questions
Update
record
What is offered?
Pages with software,
articles and FAQ's
arranged by subject :
drainage subjects
drainage
ground water
& aquifers
irrigation subjects
environment
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). Further there is information
on groundwater flow to subsurface
drains (horizontal and tile drainage) and
pumped tubewells (vertical drainage).
In sloping land the study of rainfall-surface
runoff relations simulated with a nonlinear
reservoir may be required. In general
agro-hydro-salinity simulation models
including groundwater hydraulics, are
useful for well balanced designs and
maintaining the salt balance of the soil.
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, shallow
watertables,a agricultural land
drainage, and for soil desalination. Next,
subsurface drainage for agriculture
(horizontal and vertical) is often a
prerequisite, as well in salty soils.
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
statistical models on segmented linear
regression of plant growth, crop production,
salt tolerance, and yield responses.
The software on probability distribution fitting
of hydrologic factors can also be freely
downloaded.
Reports and case studies,
free download
A list of project evaluations and case studies on
water-management, agricultural land drainage,
and irrigation can be found on the
published reports
page and also on the
particular reports
page.
In these reports one can find data on drainage
for salinity control in agriculture with the aim
to remediate soil salination (salinisation).
The same holds for reclamation, rehabilitation,
restoration and improvement of salty, saline,
alkaline and acid sulphate/sulfate soils.
Updates
I intend to update and expand this website
regularly and include
update reports.
Land reclamation
Land improvement
[
画像:waterlogging and salinity]
Looking over the shoulder of a farmer
to his waterlogged and saline land with shallow
watertable.
The salt tolerance of the crop is insufficient
to produce a good yield.
The irrigated land needs drainage to prevent
waterlogging (shallow watertables) and to reduce
the soil salinity.
See also this
salinity article or
this
drainage article
cotton crop and salt tolerance
When dealing with waterlogged and saline soil
it is important to grow salt tolerant crops that
resist high levels of salinity.
The figure shows the crop response to soil
salinity of cotton grown in farmers' fields in
Pakistan.
It appears that cotton can withstand salinities
up to ECe = 17 dS/m, which is quite high. The number
of data beyond that point is limited so that it is
difficult to conclude what happens there.
When the land is properly drained, the soil
will not salinize any further.
See also this
tolerance article
[
画像:pumping for drainage]
When dealing with drainage systems for salinity
control in low land and maintaining the water
and salt balance in the soil, one may need a
pumping station to evacuate the water, as seen
in this picture
Care should be taken that drainage is not done
excessively causing salinization elsewhere, see
this artice on
cautious drainage
Drain spacing equations can help to avoid damage,
see this paper on the energy balance of
groundwater flow
to drains.
