The Visual Two-Zone Model (Visual TWZN) is freeware software to build up groundwater numerical modeling, in both radial and vertical flow components trough an abstraction well in layered aquifers. The conceptual model and computer native code was developed by Rushton and Redshaw (1979), Rathod and Rusthon (1984 and 1992), and the graphical user interface was developed by our Group Member, the hydrogeologist Noél Hernández Laloth.