Subject: Re: re eelvru<br/>
Date: Jul 31, 2003 @ 13:58<br/>
Author: acroorca2002 (&quot;acroorca2002&quot; &lt;orc@...&gt;)<br/>
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<div id="ygrps-yiv-609782108">--- In <a rel="nofollow" target="_blank" href="mailto:BoundaryPoint@yahoogroups.com">BoundaryPoint@yahoogroups.com</a>, &quot;Jan S. Krogh&quot; <br/>
&lt;jan.krogh@t...&gt; wrote:<br/>
<blockquote><span title="ireply"> &gt; THALWEG<br/>
&gt; 1. «A German term, literally &quot;downstream,&quot; with reference to <br/>
 </span></blockquote>river<br/>
<blockquote><span title="ireply"> &gt; navigation. Here referring to the deepest channel in a river, <br/>
 </span></blockquote>genereally the<br/>
<blockquote><span title="ireply"> &gt; most suitable channel for navigation at the normal lowest <br/>
 </span></blockquote>water level.»<br/>
<blockquote><span title="ireply"> &gt; (Biger, p. 522)<br/>
&gt; <br/>
&gt; 2. «(täl´cäk), n. [G.] a line on a topographical surface having <br/>
 </span></blockquote>everywhere<br/>
<blockquote><span title="ireply"> &gt; the direction of greatgest slope, and distinguished by having <br/>
 </span></blockquote>the lines of<br/>
<blockquote><span title="ireply"> &gt; straight horizontal projection which cut all contours at right <br/>
 </span></blockquote>angles.»<br/>
<blockquote><span title="ireply"> &gt; (Webster&#39;s Unabridged)<br/>
&gt; <br/>
&gt; OK! OK! I will look for the treaties! ;-)<br/>
&gt; <br/>
&gt; (How to find the deepest channel in a 5 metre broad river?!?)<br/>
<br/>
 </span></blockquote>for starters just look for the thread of the stream on the surface<br/>
<br/>
they call it the thread because it actually appears as a thin line<br/>
<br/>
the depression you see as a line on the surface is just the water <br/>
column falling into the deepest groove in the bed<br/>
<br/>
then<br/>
if that is inconclusive because some beds are flatter than groovy<br/>
or even just to convince yourself that it is true<br/>
& unless it looks dangerous or you are feeling unlucky etc etc<br/>
just try walking right down to your objective <br/>
& feeling for it with your big toe<br/>
exactly as you might walk up to an obelisk tip <br/>
to touch it with your index finger<br/>
<br/>
& then <br/>
but only if you encounter some resistance or difficulty in trying <br/>
this most simple & direct approach<br/>
fall back to pole sounding<br/>
& of course use some form of flotation if necessary or wanted</div>