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-    moveable boundary where the head is equal to the elevation of the boundary

- water table or top flow linę where the location may not be known initially

Seepage-Face Boundary

-    surface of seepage associated with a free surface boundary

-    location is predetermined but length is unknown

-    can be ignored for regional modeling

• Defining Initial Conditions in Ground-Water Flow Modeling (D 5610 - 94)

Defining Steady-State Initial Conditions for a Transient-State Simulation of Head Distribution

-    field conditions that represent approximately an equilibrium condition

-    initial conditions might include model head adjustment to offset unknowns lack of

definite Information on boundary conditions, aquifer hydraulic properties and initial head values

Defining Transient-State Initial Condition for a Transient-State Simulation of Absolute Head

-    the simulation boundary conditions and hydraulic properties are simulated over a long

period of time so that stresses before the simulations are insignificant

Defining the Initial Head for Steady or Transient-State Simulation of Head Change in Response to a Stress

-    models only the water-level changes related to the application of a stress

-    applies the principle of superposition, if applicable

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