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-rw-r--r--doc/fullswof-utils.texi32
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diff --git a/doc/fullswof-utils.texi b/doc/fullswof-utils.texi
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@@ -211,6 +211,38 @@ and a discharge value are calculated for each cell along the boundary.
At grid cells where the calculated values are zero the wall boundary
condition, case 2, is applied.
+Each time @command{makeBoundary} runs it reads two input files and
+produces one output file. The first input file, named
+@file{topography.txt}, provides the height data. This file is also used
+by @emph{FullSWOF} to define the domain topography. The file may be
+saved in the current working directory or, alternatively, a symbolic
+link to a file in an external directory may be created. To create such
+a link use a command of the form:
+
+@example
+ln -s /path/to/topography/file topography.txt
+@end example
+
+The second input file is the @emph{boundary definition file}. This file
+specifies the boundary type, the global discharge across the boundary
+and the local gradient. Extra control parameters allow the global
+discharge to be split across separate regions. Surface roughness may be
+defined for the each region individually. @xref{Boundary Definition
+File} for details of the input parameters and the file format.
+
+@command{makeBoundary} generates an output file in the format required
+by the @emph{FullSWOF} solver. Depending on the value of the
+@option{boundary} command-line option, the filename of the output file
+is one of @file{BCTop.txt}, @file{BCBottom.txt}, @file{BCLeft.txt} or
+@file{BCRight.txt}.
+
+@menu
+* Boundary Definition File::
+@end menu
+
+@node Boundary Definition File, GNU Free Documentation License, Invoking makeBoundary, Invoking makeBoundary
+@comment node-name, next, previous, up
+@subsection Boundary Definition File
@node GNU Free Documentation License, Index, Usage, Top
@appendix GNU Free Documentation License