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Subsurface simulations can be performed to simulate the lateral flow of saturated groundwater movement and interactions with surface water. The 2-D free surface equation (Pinder and Bredehoeft 1968) is solved using finite difference techniques (Trescott and Larson 1977; Downer 2002). Selecting this option requires the assignment of appropriate boundary conditions and parameters to define the groundwater media. Details of simulating saturated groundwater are discussed in Chapter 12.

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Channel routing options
Long-term simulations
Subsurface features