GGU-DRAWDOWN: Preface
The GGU-DRAWDOWN program allows analysis of multiple well installations. The theoretical basis for the calculations is mainly taken from HERTH/ARNDTS 'Theorie und Praxis der Grundwasserabsenkung' (Ernst & Sohn, Berlin; 3rd Edition, 1994). Further to this, you are referred to the section on 'Grundwasserströmung - Grundwasserhaltung' from RIESS, in the Grundbautaschenbuch (1997), where the theoretical principles are well explained.
Rectangular and any other shape of excavations can be analysed. The influence of open water and of sheet pile walls can be taken into consideration. The program has optimisation routines for well number, well radius and well depth. After entering the excavation dimensions, you can thus immediately switch to the optimisation routines and get, within seconds, an optimally configured groundwater management regime. Comprehensive graphical evaluation options (drawdown sections, system sections, normal and coloured contours, as well as several legends) allow presentation of the complete analysis results on the screen. Besides this, you naturally have the option of printing a data output table.
Several example files are provided with the program. Before starting work with the program you should open these files to view the variety of visualisation options the program offers (select the menu item "File/Load" for this).
The program includes convenient data input. The system is permanently displayed on the screen. Every change to the data is displayed on the screen, so that optimum control of the input data is guaranteed.
There are "?" and "Info"’ buttons in the dialog boxes for many technical and program-specific questions. Click on the "?" buttons or "Info" buttons to obtain the necessary information.
The graphic output supports the true type fonts provided by WINDOWS, so that an excellent layout is guaranteed. Colour output and numerous graphic formats (BMP, TIF, JPG etc.) are supported. PDF and DXF files can also be imported via the integrated Mini-CAD system (see "Mini-CAD" manual).
The program has been extensively tested. No errors have been found. Nevertheless, liability for completeness and correctness of the program and the manual, and for any damage resulting from incompleteness or incorrectness, cannot be accepted.
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