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Introduction to FLOWPATH II for Windows FLOWPATH II for Windows is the next generation of the world's most popular 2-D groundwater model. This latest version of FLOWPATH has been radically improved with many new features and enhanced graphical display to give you more power, flexibility and control than ever before! In addition, FLOWPATH II now includes contaminant transport to give you even more simulation capabilities. The new interface for FLOWPATH has all the features you would expect from a Windows application including zoom displays, true type fonts, liberal use of the right mouse button for extended options, fully object-oriented wells, properties and boundary conditions, and rich utilization of colors for presentation of results. However, in spite of all these new features, FLOWPATH II retains the same simple structure and easy-to-use approach to modeling that has made it the software of choice for practicing hydrogeologists and environmental engineers around the world. FLOWPATH II for Windows has everything you need to create either a simple or complex 2-D groundwater flow and contaminant transport model: (1) Graphically assign all necessary flow and transport parameters, (2) Run the simulation, (3) Calibrate the model using calibration statistics and graphical results, and (4) Visualize full-color, high-resolution results. For professional applications in two-dimensional groundwater flow and contaminant transport modeling, FLOWPATH II for Windows is the only software package you will ever need! |
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Grid Design Features
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Wells
Each well is a separate object which is tied to the location within the model domain. This means that modifications to the model grid (adding, deleting and moving rows and columns) do not affect the location or properties of the wells. |
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Properties The aquifer properties which are accounted for in FLOWPATH II include:
Model properties are assigned in FLOWPATH II using standard Windows graphical tools including lines, polygons and boxes. Each property zone is treated as an object with attributes that include a property ID #, property values, color and shape. Each of these attributes are tied to the object itself and are not affected by modifications to the model grid or other model parameters. FLOWPATH II also allows you to view the site in cross section. Although it is a two-dimensional model, it is often useful to be able to see the model in cross section to ensure that the top and bottom elevations provide a reasonable representation of the observed site characteristics. |
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Unlike other 2-D groundwater flow models, FLOWPATH II simulates all types of aquifer conditions including unconfined, confined and leaky. In order to accommodate these conditions, FLOWPATH II supports boundary conditions for both the aquifer and the aquitard. |
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Aquifer boundary conditions include:
Aquitard boundary conditions include:
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Solvers FLOWPATH II has two matrix solvers for the flow solution:
Although the PCG-STAB method will likely be the best (fastest) choice for most situations, there are instances where this method is too aggressive and will not converge. Thus the slower ADI method is required. Solver Parameters FLOWPATH II actually provides you with the ability to control the numerical solution process by manipulating the solver parameters and convergence criteria while the solution is in progress. In addition, it provides a real-time graphical display of the solution convergence data so that you can now see a real-time graphical progress report. |
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Contaminant Transport Solution Settings |
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FLOWPATH II uses the Random Walk solution process for solving the contaminant transport problem and allows the user to customize the Random Walk solution methods with Method options such as:
Other contaminant transport run settings include:
FLOWPATH II provides a graphical display of either the total mass in the system or the maximum concentration in the system and gives a detailed mass balance for each output time step. |
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Contoured Results FLOWPATH II allows you to produce and display customizable contour plots of the simulation results including:
FLOWPATH II accommodates multiple contour plot overlays to display both heads and concentration on the same plot. The contour customization settings include:
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The flow velocity vectors provide an important representation of the groundwater flow direction within a particular layer, row or column of the model. Display options include setting the number of velocity vectors per line and adjusting the scale of the velocity vectors. |
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The flow pathlines in FLOWPATH II provide an important representation of the flow direction and the path that the groundwater will follow from a specific location. Backwards particle tracking can also be used to indicate where the groundwater is coming from and how long it is taking to get there. Time-related pathlines and time markers can also be displayed on each pathline. FLOWPATH II also includes a particle animator to show the progression of a well capture zone over time. |
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FLOWPATH II has built-in analysis tools for evaluating the quality of the fit between the model you have developed and the data you have observed in the field. A contour plot of calibration residuals can be plotted (as lines or color shading) to identify model regions where the simulated data does not provide a good fit with the observed data. A regression graph of calculated vs. observed data is also available with calibration statistics. |
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Water Budget FLOWPATH II provides a detailed summary of the mass balance results and zone-to-zone flow exchanges. These mass balance results provide important information on the quality and reliability of the groundwater model you have built. If you do not achieve a reasonable mass balance between the flow entering the system and the flow leaving the system, your model will not yield reliable results. The mass balance results are summarized according to flow contributions from each type of boundary condition and can be used to troubleshoot the model and identify regions where there are unreasonable flux rates. |
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FLOWPATH II prints full-color, high-resolution graphics to any printer or plotter supported by Windows 95/NT. The graphical display of the simulation results and/or input files can be printed in portrait or landscape format as a full page image or with a title block that describes the details of the model and the results being displayed. A company logo can also be imported from a bitmap and displayed in the title block. FLOWPATH also prints the on-screen display to DXF or WMF file formats and exports results to ASCII files in 2-D. |
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FLOWPATH II Overview |
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Scientific Software Group P.O Box 708188 Sandy, Utah 84070
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Boundary Conditions
Model boundary conditions are assigned in FLOWPATH II using standard
Windows graphical tools including lines, polygons and boxes. Each boundary condition is treated as an object with attributes that include a boundary ID #, boundary values, color and shape. Each of these attributes
are tied to the boundary object itself and are not affected by modifications to the model grid or other model parameters..
Multiple concentration source terms can be assigned in FLOWPATH II
anywhere in the model domain. The individual source term input parameters include Source Concentration, Source Duration, and Decay Rate. The retardation (adsorption) term is assumed to be uniform for the
entire model domain and is accommodated in the run settings.
In addition, FLOWPATH II includes an animation builder for showing the
results of contaminant transport simulations and can plot concentration vs. distance plots for each time step in the simulation.
Flow Velocity Vectors
Pathlines
Calibration
Printing
