GWF-IC

Structure of Blocks

FOR EACH SIMULATION

    BEGIN OPTIONS
      [EXPORT_ARRAY_ASCII]
    END OPTIONS

    BEGIN GRIDDATA
      STRT [LAYERED]
            <strt(nodes)> -- READARRAY
    END GRIDDATA

Explanation of Variables

Block: OPTIONS

• EXPORT_ARRAY_ASCII keyword that specifies input griddata arrays should be written to layered ascii output files.

Block: GRIDDATA

• strt is the initial (starting) head—that is, head at the beginning of the GWF Model simulation. STRT must be specified for all simulations, including steady-state simulations. One value is read for every model cell. For simulations in which the first stress period is steady state, the values used for STRT generally do not affect the simulation (exceptions may occur if cells go dry and (or) rewet). The execution time, however, will be less if STRT includes hydraulic heads that are close to the steady-state solution. A head value lower than the cell bottom can be provided if a cell should start as dry.

Example Input File

    #The OPTIONS block is optional
    BEGIN OPTIONS
    END OPTIONS
    
    #The GRIDDATA block is required
    BEGIN GRIDDATA
      STRT LAYERED
        CONSTANT   0.0  Initial Head layer   1
        CONSTANT   0.0  Initial Head layer   2
    END GRIDDATA