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This report and the attached 3 1/2-inch diskette contain, in compressed format, the data sets for the model of ground-water flow in the Northern part of Vekol Valley. The data sets can be uncompressed using a program provided with this report. The uncompressed files require approximately 3.1 megabytes of disk space on an IBM-compatible microcomputer using the MS-DOS operating system, and all files are presented according to the American Standard Code for Information Interchange. INTRODUCTION A four-layer digital model of the ground-water flow system was developed as part of a study of the northern part of Vekol Valley, Arizona, using the MODFLOW program by McDonald and Harbaugh (1988). Results of the Vekol Valley study are described in a report by Hollett and Marie (1986). Although that report summarizes the data input to the model, detailed documentation of grid location, model input, and sample output has not been published previously. This report, which is a supplement to the report by Hollet and Marie (1986), provides detailed, electronic documentation of the model data. MODEL GRID Organization of the model grid was based on a composite of U.S. Geological Survey topographical maps, which are identified in Figures 1 and 2 of Hollett and Marie (1986). For model-grid orientation, the intersection of the right edge of column 6 and top edge of row 4 is located about 50 ft. southwest of the intersection of sections 16, 17, 20 and 21 in Township 6 South and Range 1 East (Hollett and Marie, 1986, fig. 8). The model grid is oriented with rows of model cells aligned in the east-west direction and columns of model cells aligned in the northsouth direction. INPUT AND OUTPUT FILES The original input and output files for the Vekol Valley flow model were developed on a Prime computer and transferred to an IBM-compatible microcomputer (operating under MS-DOS version 3.3). The files were then compressed so that they could be placed on a single diskette. The compression program produced a single file that contains all input and output files. The diskette included with this report contains a copy of this text (README.DOC), the library of compressed files (VEKOL.ZIP), and the decompression program (PKUNZIP.EXE). The decompression program is provided by PKWARE, Inc., 7545 North Port Washington Road, Glendale, Wisconsin. Permission to copy PKUNZIP is granted freely, provided all copies acknowledge and reference the authors and distributors of the program PKUNZIP.exe. The library can be decompressed by typing PKUNZIP followed by the library name VEKOL.ZIP and 1. Use of trade name in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.

u.s. geological survey open file report/open-file report

Documentation of model input and output values for the simulation of the ground-water flow system and proposed withdrawals in the northern part of Vekol Valley, Arizona