SIMULATION
  SIMULATION_TYPE SUBSURFACE
  PROCESS_MODELS
    SUBSURFACE_FLOW flow
      MODE RICHARDS
    /
  /
END

SUBSURFACE

GRID
  TYPE structured
  NXYZ 10 10 10
  DXYZ
   0.1d0
   0.1d0
   0.1d0
  END
END

REGION all
  COORDINATES
    0.0d0 0.0d0 0.0d0
    1.0d0 1.0d0 1.0d0
  /
END

REGION west_face
  FACE WEST
  COORDINATES
    0.d0 0.d0 0.d0
    0.d0 1.0d0 1.0d0
  /
END

REGION east_face
  FACE EAST
  COORDINATES
    1.0d0 0.d0 0.d0
    1.0d0 1.0d0 1.0d0
  /
END

REGION north_face
  FACE NORTH
  COORDINATES
    0.d0 1.0d0 0.d0
    1.0d0 1.0d0 1.0d0
  /
END

REGION south_face
  FACE SOUTH
  COORDINATES
    0.d0 0.d0 0.d0
    1.0d0 0.d0 1.0d0
  /
END

REGION bottom_face
  FACE BOTTOM
  COORDINATES
    0.d0 0.d0 0.d0
    1.0d0 1.0d0 0.d0
  /
END

REGION top_face
  FACE TOP
  COORDINATES
    0.d0 0.d0 1.0d0
    1.0d0 1.0d0 1.0d0
  /
END

MATERIAL_PROPERTY cube
  ID 1
  POROSITY 0.5
  TORTUOSITY 1.d0
  ROCK_DENSITY 2.8E3
  CHARACTERISTIC_CURVES cc1
  PERMEABILITY
    PERM_X 1.d-10
    PERM_Y 1.d-10
    PERM_Z 1.d-10
  /
END

CHARACTERISTIC_CURVES cc1
  SATURATION_FUNCTION VAN_GENUCHTEN
    LIQUID_RESIDUAL_SATURATION 0.5d-1
    M 0.75
    ALPHA 1.d-3
  /
  PERMEABILITY_FUNCTION MUALEM
    LIQUID_RESIDUAL_SATURATION 0.05d0
    M 0.5d0
  /
  PERMEABILITY_FUNCTION MUALEM_VG_GAS
    LIQUID_RESIDUAL_SATURATION 0.05d0
    GAS_RESIDUAL_SATURATION 0.1d0
    M 0.5d0
  /
END

STRATA
  REGION all
  MATERIAL cube
END

FLUID_PROPERTY
  DIFFUSION_COEFFICIENT 1.d-9
END

EOS WATER
 DENSITY CONSTANT 1000.d0 kg/m^3
 VISCOSITY CONSTANT 1.0d-3 Pa-s
END

TIME
  FINAL_TIME 1 yr
  INITIAL_TIMESTEP_SIZE 1.d-4 day
  MAXIMUM_TIMESTEP_SIZE 0.10 yr at 0.d0 yr
END

OUTPUT
  SNAPSHOT_FILE
    NO_PRINT_INITIAL
    FORMAT HDF5
  /
END

DATASET pressure_bc_west
  HDF5_DATASET_NAME node_centered_surf_west
  FILENAME ../dataset.h5
END

DATASET pressure_bc_east
  HDF5_DATASET_NAME node_centered_surf_east
  FILENAME ../dataset.h5
END

DATASET pressure_bc_north
  HDF5_DATASET_NAME node_centered_surf_north
  FILENAME ../dataset.h5
END

DATASET pressure_bc_south
  HDF5_DATASET_NAME node_centered_surf_south
  FILENAME ../dataset.h5
END

DATASET pressure_bc_bottom
  HDF5_DATASET_NAME node_centered_surf_bottom
  FILENAME ../dataset.h5
END

DATASET pressure_bc_top
  HDF5_DATASET_NAME node_centered_surf_top
  FILENAME ../dataset.h5
END

FLOW_CONDITION initial
  TYPE
    LIQUID_PRESSURE dirichlet
  /
  LIQUID_PRESSURE 1.0 MPa
END

FLOW_CONDITION west_face
  TYPE
    LIQUID_PRESSURE dirichlet
  /
  LIQUID_PRESSURE DATASET pressure_bc_west
END

FLOW_CONDITION east_face
  TYPE
    LIQUID_PRESSURE dirichlet
  /
  LIQUID_PRESSURE DATASET pressure_bc_east
END

FLOW_CONDITION north_face
  TYPE
    LIQUID_PRESSURE dirichlet
  /
  LIQUID_PRESSURE DATASET pressure_bc_north
END

FLOW_CONDITION south_face
  TYPE
    LIQUID_PRESSURE dirichlet
  /
  LIQUID_PRESSURE DATASET pressure_bc_south
END

FLOW_CONDITION bottom_face
  TYPE
    LIQUID_PRESSURE dirichlet
  /
  LIQUID_PRESSURE DATASET pressure_bc_bottom
END

FLOW_CONDITION top_face
  TYPE
    LIQUID_PRESSURE dirichlet
  /
  LIQUID_PRESSURE DATASET pressure_bc_top
END

INITIAL_CONDITION initial
  REGION all
  FLOW_CONDITION initial
END

BOUNDARY_CONDITION west_face
  REGION west_face
  FLOW_CONDITION west_face
END

BOUNDARY_CONDITION east_face
  FLOW_CONDITION east_face
  REGION east_face
END

BOUNDARY_CONDITION north_face
  REGION north_face
  FLOW_CONDITION north_face
END

BOUNDARY_CONDITION south_face
  FLOW_CONDITION south_face
  REGION south_face
END

BOUNDARY_CONDITION bottom_face
  REGION bottom_face
  FLOW_CONDITION bottom_face
END

BOUNDARY_CONDITION top_face
  FLOW_CONDITION top_face
  REGION top_face
END

END_SUBSURFACE