GGU-DRAWDOWN: Enter base data for calculation

For input of system base data and for an estimation of the number of wells, select the menu item "Edit/Base data". You will see the following dialog box:

The variables are explained in Figure 1 and Figure 2. The k-value can be entered directly or, after clicking the "Determine" button, be determined using the Hazen or Beyer methods and transferred to the input box.

Using the "Common soils" button, you can easily select the permeabilities of many common soils from a database or determine intermediate values. In the dialog box, which you open by pressing the "Common soils" button, open the "Soils_english.gng_ggu" file when first starting the program in English ("Edit table"/"Load" buttons). Then save the data set in the "Soils.gng_ggu" file on the program level in order to open your modified database file when the program starts. You can also enter your own data ("Edit table"/"x soils to edit" button) and save it in the "Soils.gng_ggu" file.

The default aquifer is assumed to be unconfined. If the system is confined, activate the "Confined aquifer" check box and enter the thickness of the aquifer in addition to the other data. With regard to specifying the range and computing the equivalent radius, please refer to the information available by pressing the corresponding buttons in the dialog box. After adapting your data, adopt them by pressing the "OK" button.