The structure of GWLF is illustrated in Figure 2. Once the program has been activated, the main control
page appears on the screen, as shown in DISPLAY 1.This page is the main menu page that leads to the four
major options of the program. The selection of a program option provides access to another set of menu
pages within the chosen option. After completing an option, the program returns the user to the main menu
page for further actions.
Figure 2. Structure of the GWLF Program.
The selection of the menu options is done by typing the number indicating a choice and then Enter. For
example, selection of Run simulation is done by typing 3 and Enter.
Transport Data Manipulation
The first step in using the program is to define transport parameters either by creating a new transport
data file or modifying an existing one. Options are shown in DISPLAY 2. If the user wishes to create a new
transport data file, selection of Create new TRANSPRT.DAT file leads to the input mode. On the other hand, if
the user wishes to modify an existing transport data file, selection of Modify existing TRANSPRT.DAT file
leads to the modification mode. After input/modification, the user can obtain a hard copy of the transport data
by selecting Print TRANSPORT data.
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