Summary:
The WellDrain computer program calculates the drainage discharge,
hydraulic head, 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.
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Details:
The well spacing calculations are based on the traditional concepts of
the Darcy and water balance 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.
Thanks to Mr. Richard Bertram, on 29 April 2009, an inconsistency in use of symbols
was removed. The program has now a floating explanatory figure.
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Start:
The program starts clicking on WellDrain.Exe.
More information is found in the program itself.
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Documentation:
A description of the physical and mathematical theory of groundwater
(ground-water) flow to pumped drainage wells can be
consulted here.
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.
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Download:
WellDrain
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