GWF BASIC PACKAGE Reads data specifying initial and boundary conditions (IBOUND, STRT). Select options such as plan-view model or cross-section model (XSECTION),

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GWF BASIC PACKAGE Reads data specifying initial and boundary conditions (IBOUND, STRT). Select options such as plan-view model or cross-section model (XSECTION), free format or fixed format (FREE), and performing or not performing certain constant head node calculations (CHTOCH). Reads a dummy head value to indicate inactive cells (HNOFLO) BAS6

GWF BASIC PACKAGE Basic input data from file type specified as BAS6 in the Name File Options Is a character variable scanned for words. Three options are currently recognized XSECTION CHTOCH FREE A blank record is acceptable as no options (so is the words No Options) BAS6

GWF BASIC PACKAGE OPTIONS XSECTION Indicates that the model is a 1-row cross section with arrays dimensioned (NCOL,NLAY). CHTOCH Indicates that the flow between adjacent constant-head cells should be calculated. FREE Specifies that free format is to be used in all packages where applicable. Note: Be sure all variables read using free format have non-blank values, and have blanks or commas between adjacent values. BAS6

GWF BASIC PACKAGE IBOUND An array for each layer that contains a code for each layer cell which indicates that 1. The head varies with time, 2. The head is constant (constant head cell), or 3. No flow takes place within the cell (no flow cell) BAS6

GWF BASIC PACKAGE IBOUND(NCOL,NROW) or (NCOL,NLAY) – U2DINT Is the boundary array, if IBOUND(I,J,K) < 0 Constant head cell, IBOUND(I,J,K) = 0 Inactive, IBOUND(I,J,K) > 0 Variable head One value is read for every cell, layer at a time except when XSECTION option is specified. BAS6

GWF BASIC PACKAGE HNOFLO Is the value head to be assigned to all inactive cells (IBOUND=0) throughout the simulation. STRT Is the initial starting head. STRT must be specified for all simulations, including steady state. One value is read for every cell, layer at a time except when XSECTION option is specified. BAS6

GWF BASIC PACKAGE BAS6