## Groundwater flow analysis

### SEEP/W is a powerful finite element software product for modeling groundwater flow in porous media. SEEP/W can model simple saturated steady-state problems or sophisticated saturated / unsaturated transient analyses with atmospheric coupling at the ground surface.

### Add SEEP3D to SEEP/W to analyze 3D groundwater flow using the same comprehensive set of material models and boundary conditions.

### Boundary Conditions

SEEP/W supports a range of boundary condition options. Field data or user-specified functional relationships can be inputted to define hydrographs, reservoir fluctuations, rainfall cycles, vegetation effects, or land-climate interactions.

### Integration

Integration of SEEP/W with SLOPE/W makes it possible to analyze the stability of any natural or man-made system subject to transient changes in pore-water pressure. Seamlessly combine SEEP/W and SEEP3D, to analyze 2D and 3D groundwater flow in the same project file.

### Material Properties

Hydraulic conductivity and volumetric water content functions can be estimated using built-in functions. The estimation process requires only fundamental information. A saturated-only material model is also available.

### Saturated/Unsaturated

The rigorous saturated/unsaturated formulation of SEEP/W means that even the most demanding flow problems, such as infiltration into dry soil or seepage through complex upstream tailings dams, can be analyzed with ease.

### Seepage Through an Earth Dam

This example looks at a case of flow through an embankment dam. This case appears in most text books on seepage and consequently most SEEP/W users will have a good idea as to what the solution should look like. The example illustrates how easy it is to find the downstream seepage face when the dam is all one material.

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SEEP/W

### Perched Water Table

This example demonstrates how to use SEEP/W computed pore-pressures in a SLOPE/W stability analysis. The problem creates a perched watertable under long term net infiltration of precipitation. This perched condition can only be properly handled by directly using the SEEP/W results in SLOPE/W.

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SEEP/W SLOPE/W

### 3D Relief Well Spacing

A 3D seepage analysis is required to design a relief well system, for example to alleviate excess pressure developing on the landward side of water retention dams or levees. This example demonstrates how to create and evaluate well spacing using SEEP/W and SEEP3D.

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SEEP/W SEEP3D

### Soil Cover Modeling - Hydraulic Response

This example illustrates the basic methodology for simulating soil-climate interactions and the corresponding water flows through an engineered soil cover system placed over a waste material.

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SEEP/W

Create the domain geometry using CAD-like drawing tools, including drawing polygon and circular regions, coordinate import, copy-paste geometric items, length and angle feedback, region splitting and merging, and direct keyboard entry of coordinates, lengths, and angles. SEEP3D includes a suite of intuitive sketch tools for setting up 3D geometries. Alternatively, import AutoCAD DWG or DXF files directly into GeoStudio.

Define the material properties for your analysis, assign them to regions on the domain, and then define your initial pore-water pressure conditions. Select from Saturated/Unsaturated and Saturated Only material models. Define hydraulic material functions using spline data point entry, Fredlund-Xing or van Genuchten methods. Define the initial pore-water pressure conditions for transient scenarios using results from other SEEP/W analyses, defined spatial functions or draw an initial water table.

Define hydraulic boundary conditions to simulate total head, pressure head, pore-water pressure, unit flux (q), total flux (Q) or climatic conditions. Time-varying conditions can also be modeled using total head, pressure head, unit flux (q) or total flux (Q) vs. time functions. The total head vs. volume function can also be used to simulate volume of water entering or exiting the domain via a specified boundary.

In SEEP/W, open Draw Mesh Properties to refine the mesh drawn on the entire domain, or along specific geometric regions, lines or boundaries. Interface elements can also be created to simulate geosynthetic or other thin materials. For SEEP3D analyses, create the finite element mesh with a single click of a button in the 3D editor's mesh view.

When the Solver is finished, the Total Head contours are displayed, along with the location of phreatic surface, or zero pressure isoline, and flux vectors. You can display other contours of almost any parameter including pore-water pressure, material properties, water flow, and gradients, using the Draw Contours window. Contour legends and properties can also be modified. Labels can be added to contour lines for display in Results View. Flow paths can also be drawn in steady-state analyses.

Interactively select any node or gauss region to view result information, including total head, pore-water pressure, material properties, and more. Display plots of computed results over the x- or y-direction or create time-varying plots of results in transient analyses, such as total head, water flux, cumulative water volume, and more. Generate reports of the definition and results, and export into other applications such as Microsoft Excel for further analysis.

## The power of integration

### SEEP/W offers simple but powerful analytical capabilities when used in combination with other GeoStudio products.

### SEEP/W results in SLOPE/W

Using SEEP/W finite element pore-water pressures in SLOPE/W makes it possible to deal with complex saturated/unsaturated conditions or transient pore-water pressure conditions. From a transient analysis, we know the pore-water pressure conditions at various points in time. Using these time-varying pore-water pressure results in SLOPE/W makes it possible to look at the changes in stability with time.SEEP3D results may also be used in SLOPE/W by generating a 2D cross-section associated with the 3D geometry.

### SEEP/W results in SIGMA/W

SEEP/W pore water pressures can be used by SIGMA/W to simulation in situ effective stresses.

### SIGMA/W pore-water pressures in SEEP/W

Excess pore-water pressures generated during any kind of loading (fill placement, for example) can be used in SEEP/W to study how long it will take for the excess pore-water pressure to dissipate. This can help with specifying the rate of loading.

### QUAKE/W results in SEEP/W

The QUAKE/W computed excess pore-water pressures generated during an earthquake can be used in SEEP/W to study how long it will take for the excess pore-water pressure to dissipate.

### Convective Heat Flow

A major component in a TEMP/W analysis may be the movement of heat due to water flow. TEMP/W can use the water fluxes from SEEP/W to model forced-convection heat transfer.

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**### Density-Dependent Flow

### Density-Dependent Flow

In density-dependent fluid flow, the density of the water is dependent on the temperature. The water velocity in turn influences the distribution of heat throughout the domain. Thus, heat and water flow are coupled. The new multi-physics capabilities in GeoStudio 2018 allow for the simultaneous simulation of heat and water movement associated with density-dependent flow.

### SEEP/W results in CTRAN/W

One of the major components in a contaminant transport analysis is the velocity of the water, which can be obtained from a SEEP/W analysis. Once this velocity is known, it can be used in CTRAN/W to study the transport of contaminants.

### Density-Dependent Flow

** **

In density dependent fluid flow, the density of the water is dependent on the solute concentration. The water velocity in turn influences the movement of the solute. SEEP/W and CTRAN/W therefore need information from each other. The iterative transfer of water velocity from SEEP/W to CTRAN/W and the transfer of concentration from CTRAN/W to SEEP/W makes it possible to do density dependent fluid flow analyses.

### Couple AIR/W with SEEP/W

Coupled air-water systems can be modeled with SEEP/W and AIR/W. The two systems are coupled via the matric suction, which is the difference between the pore-air and pore-water pressures. A change to the air pressure will cause a change in the water pressure and vice versa. This type of analysis can be useful for modelling mine closure cover systems or water/air movement in acid generating waste rock.