<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8">
<META NAME="GENERATOR" CONTENT="GtkHTML/3.2.3">
</HEAD>
<BODY>
Hi Matthew,<BR>
<BR>
I would use r.mapcalc and calculate water volume slices from the deepest point of your basin in, say, 1 meter steps. As the resulting volume exceeds Y cubic meters of water (your threshold), you know how high your dam should be. This can be easily scripted. You can adjust the step size (1 meter) according to your accuracy needs.<BR>
<BR>
-Jeroen.<BR>
<BR>
<BR>
On Fri, 2007-11-30 at 19:14 -0800, Matthew Perry wrote:
<BLOCKQUOTE TYPE=CITE>
<PRE>
<FONT COLOR="#000000">Hi all,</FONT>
<FONT COLOR="#000000">I've used r.lake to answer the question "What land is inundated given</FONT>
<FONT COLOR="#000000">a X meter high dam?". In this case however, X is the unknown so I'm</FONT>
<FONT COLOR="#000000">trying to answer the question "How high does the dam have to be in</FONT>
<FONT COLOR="#000000">order to hold Y cubic meters of water?" as well as to determine the</FONT>
<FONT COLOR="#000000">"inundation footprint".</FONT>
<FONT COLOR="#000000">I'm familiar with some engineering models that require much more</FONT>
<FONT COLOR="#000000">detailed cross-sectional information than we have available...</FONT>
<FONT COLOR="#000000">currently we have a high-res DEM as our sole source. Are there any</FONT>
<FONT COLOR="#000000">GRASS modules or scripts that I should take a look at?</FONT>
<FONT COLOR="#000000">Thanks for the input,</FONT>
</PRE>
</BLOCKQUOTE>
</BODY>
</HTML>