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    What is WinFlow?

    What is WinTran?

    System Requirements for Winflow-WinTran

What is WinFlow?

WinFlow is a powerful yet easy-to-use groundwater flow model. The user-interface of WinFlow represents the most sophisticated and WindowsTM GUI available today. WinFlow provides an extensible common user-interface for analytical analyses and models capable of hosting other calculation engines in the future.

WinFlow is an interactive, analytical modeling tool that simulates two-dimensional steady-state and transient ground-water flow. The steady-state module in WinFlow simulates ground-water flow in a horizontal plane using analytical functions developed by Strack (1989).

Subsurface System WinFlow Simulation Capabilities Include:

• Confined systems (Theis, 1935)
• Leaky systems (Hantush and Jacob,1955; and Hantush, 1960)
• Unconfined systems (Neuman, 1972)

In addition to the above WinFlow simulation capabilities, WinFlow extends other analytical solutions from the popular AquiferWin32 pumping test analysis application into its modeling environment. These additional solutions in WinFlow support any number of pumping wells with variable pumping rates. Auto-calibration to any number of transient targets is also supported by WinFlow for these additional solutions.

Available Analytic Elements for WinFlow Simulations:

• Wells
• Uniform Recharge
• Circular Recharge/Discharge Areas
• Line Sources/Sinks

WinFlow depicts the flow field using streamlines, particle traces, and contours of hydraulic head. The streamlines are computed semi-analytically to illustrate ground-water flow directions. Particle-tracking techniques in WinFlow are implemented numerically to compute travel times and flow directions. Both confined and unconfined aquifers are simulated in WinFlow with the steady-state module.

WinFlow is simple to use and highly interactive, allowing you to create an analytical model in minutes. WinFlow features standard Windows pulldown menus and tab dialogs to facilitate the model design. WinFlow is recomputed and recontoured either by selecting a menu item or by pressing a toolbar button. Streamlines and particle-traces are added interactively and recomputed each time new wells or other elements are added.

WinFlow can import a Drawing Interchange Format (DXF) file (from AutoCAD for example) to use as a digitized map. QuickFlow and ModelCAD-format map files may also be imported into WinFlow. The digitized map gives the modeler a frame of reference for designing the analytical model.

WinFlow produces report-quality graphics using any Windows device driver. Output from WinFlow may also be exported to a wide variety of file types, including SURFER, Geosoft, Spyglass, Windows Metafiles, and AutoCAD-compatible DXF files.

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What is WinTran?

WinTran is designed to be an easy-to-use model for simulating the fate and transport of dissolved contaminants in fully saturated groundwater systems. The WinTran model couples the steady-state groundwater flow model from WinFlow, with a contaminant transport model. The transport model in WinTran feels like an analytic model but is actually an embedded finite-element simulator. WinTran automatically constructs the finite-element transport model so that you may quickly get answers to your groundwater problems.

The contaminant transport model in WinTran uses a finite-element formulation whereby the finite-element mesh is identical to the head contour matrix. The contour matrix is a rectangular array of points where head is computed by the flow model. WinTran computes groundwater velocity at each "node" in the contour matrix for use in the finite-element transport model.

Real-Time Trouble Shooting Diagnostic Display Capabilities in WinTran:

• Mass Balance Error
• Peclet Number
• Courant Number

Contaminant mass may be injected or extracted in WinTran using any of the analytic elements from WinFlow, including wells, ponds, and linesinks. In addition, constant concentration elements may be placed in WinTran to keep the source contaminant concentration at a specified value. WinTran displays both head and concentration contours. Concentration versus time data may be calculated and graphically displayed in WinTran for selected monitoring locations.

Transport Processes Represented in WinTran:

• Advection and Dispersion
• Linear Sorption (retardation)
• First-Order Decay Including Biologic/Organic/Radioactive Compounds

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System Requirements for Winflow-WinTran

• Designed for 9x/ME/NT/2000/XP environments
• 40 MB of hard-disk space

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Summary of WinFlow/WinTran