Price: $540 ($200 when ordered together with WinFlow)

WinTran couples the steady-state ground-water flow model from WinFlow with a contaminant transport model. The transport model has the feel of an analytic model but is actually an embedded finite-element simulator. The finite-element transport model is constructed automatically by the software but displays numerical criteria (Peclet and Courant numbers) to allow the user to avoid numerical or mass balance problems.

Contaminant mass may be injected or extracted using any of the analytic elements, including wells, ponds, and linesinks. In addition, constant concentration elements have been added. WinTran displays both head and concentration contours and concentration may be plotted versus time at selected monitoring locations. The transport model includes the effects of longitudinal and transverse dispersion, molecular diffusion, linear sorption (retardation), and first-order decay. Dispersion, diffusion, retardation and decay act uniformly over the model domain. Other features include:

• Simulates steady-state flow and transient transport in confined & unconfined aquifers;
• Simulates effects of wells, linesinks, ponds, and constant concentration sources;
• 32-bit software uses all memory available to Windows;
• Supports Windows V3.1 (with Win32s), Windows NT, and Windows 95;
• Displays Peclet and Courant criteria during transport simulation;
• Displays mass balance error during simulation;
• Contours concentration at user-specified time steps during simulation;
• Velocities computed either analytically or using finite-element flow model;
• Maps may be printed using any Windows device driver;
• WYSIWYG printing with print preview and user-defined margins;
• Full context-sensitive help system (the entire manual is on-line);
• All other features are the same as WinFlow (except transient flow model)

SYSTEM REQUIREMENTS

The WinFlow program requires at least an Intel 80386 based computer with 4 Mb RAM, a math coprocessor, DOS 5.0, Windows 3.1, about 2 Mb disk space to install the program, and VGA graphics or better.

Developer: Environmental Simulations, Inc., Herndon, Virginia.