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Online Guide to MODFLOW-2005

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List Utility Module (ULSTRD)

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The List Utility Module is used to read lists of data in a variety of packages.


Harbaugh, A.W., Banta, E.R., Hill, M.C., and McDonald, M.G., 2000, MODFLOW-2000, the U.S. Geological Survey modular ground-water model -- User guide to modularization concepts and the Ground-Water Flow Process: U.S. Geological Survey Open-File Report 00-92, 121 p.


Other Notes

The List Utility Module is never used independently from packages so it does not have a separate symbol in the name file.

Binary files can be read if they are EXTERNAL or OPEN/CLOSE as specified below. SFAC is not read for binary files. In Binary files the first list 3 values (layer, row, and column) must be Real numbers even though these values are actually Integers in the model. These values will be converted to Integers before use in the model. All auxiliary data must be included in the binary file. (MODFLOW-2005 only)

Input Instructions

Module ULSTRD reads lists, which are any number of repetitions of an input item that contains multiple variables. Examples of packages that make use of this module are the General-Head Boundary, Drain, River, and Well Packages.

Data Set 1


If Item 1 is not included, then the list is read from the package file. Item 1 must begin with the keyword “EXTERNAL” or the keyword “OPEN/CLOSE” (not both).

Data Set 2

[ SFAC Scale]

Data Set 3

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