Zone File

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Purpose

The Zone File defines the numeric and composite zones for which subregional water budgets will be computed.

Documentation

•Harbaugh, A.W., 1990, A computer program for calculating subregional water budgets using results from the U.S. Geological Survey modular three-dimensional ground-water flow model: U.S. Geological Survey Open-File Report 90-392, 46 p.

•zonbud3.pdf

Input Instructions

Data Set

Description

Data Set 1

NLAY NROW NCOL

•NLAY is the number of model layers.

•NROW is the number of model rows.  

•NCOL is the number of model columns.

These are checked for consistency with the grid dimensions included in the budget file.

Data Set 2

This array is read one model layer at a time, starting with layer 1. The user can choose from three input forms for each layer.

•hmtoggle_plus1        Form 1: CONSTANT ICONST

The word “CONSTANT” is a keyword that signifies that the entire layer should have the same value, which is specified in the ICONST field.

•hmtoggle_plus1        Form 2: EXTERNAL FMTIN IPRN

The keyword “EXTERNAL” indicates that the zone values for the layer are read from a separate file whose name is specified on the following line. The values are read one row at a time, starting with row 1, using the Fortran format specified in field FMTIN. FMTIN must begin with “(“ and end with “)” as required by Fortran. If the value in parentheses is blank, free format is used. IPRN specifies whether or not the zone values read are printed in the output file. If IPRN is greater than or equal to 0, the zone values will be printed. If IPRN is less than 0, zone values will not be printed.

•hmtoggle_plus1        Form 3: INTERNAL FMTIN IPRN

•“INTERNAL” indicates that the zone values for the layer are read from the Zone file immediately following Item 2. The values are read one row at a time, starting with row 1, using the Fortran format specified in field FMTIN. FMTIN must begin with “(“ and end with “)” as required by Fortran. If the value in parentheses is blank, free format is used. IPRN specifies whether or not the zone values read are printed in the output file. If IPRN is greater than or equal to 0, the zone values will be printed. If IPRN is less than 0, zone values will not be printed.

Data Set 3

Up to 100 composite zones can be defined, with each composite zone consisting of up to 50 numeric zones. Each composite zone is specified on a single line. A composite zone need not include 50 numeric zones; simply terminate the line after specifying the desired zones. Specify as many lines as required for the desired number of composite zones. NAMCOMP is the name for the composite zone, which is optional as indicated by “[ ]”. The name must start with a non-numeric character and can consist of up to 10 characters. If NAMCOMP is not included, a name is automatically generated.