Subject: Re: [BoundaryPoint] world class border arc census was Re: real bjneng try afoot<br/>
Date: Jul 07, 2004 @ 21:38<br/>
Author: Lowell G. McManus (&quot;Lowell G. McManus&quot; &lt;mcmanus71496@...&gt;)<br/>
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<div id="ygrps-yiv-494035608">Michael Kaufman wrote:<br/>
<br/>
<blockquote><span title="ireply"> &gt; 17.-??? MXUS  (msg. 13937; how many are there?)<br/>
&gt; SO,<br/>
&gt; We can&#39;t put a firm number on it.  Depends on 3<br/>
&gt; variables:<br/>
&gt; 1. Where DZLYTN falls.  If there is a short LYTN we<br/>
&gt; have 18 not 17.<br/>
&gt; 2. Also, do we know 12 for BJNG?  So it would be more<br/>
&gt; or less if not exactly 12.<br/>
&gt; 3. And how many more arcs for MXUS on the channelized<br/>
&gt; Rio Grande?<br/>
<br/>
 </span></blockquote>I find that there are no less than nine arcs in the channelized segments of the<br/>
Rio Grande portion of the MXUS boundary.<br/>
<br/>
The channel relocation maps accompanying and made a part of the 1970 MXUS treaty<br/>
show four arcs with their geometric specifications (deg-min-sec of arc, length<br/>
of radius, linear length, tangent, plus distance figures for &quot;C,&quot; whatever that<br/>
is).  As I stated in message 13937, the largest of these is just above<br/>
Hidalgo/Reynosa.  The others three are in the vicinity of Presidio/Ojinaga (two<br/>
above and one below).  I can furnish specifications on request.<br/>
<br/>
There are five arcs specified in the &quot;engineering considerations&quot; annexed to the<br/>
Chamizal Convention of 1963 that describe the channelization of 4.3 miles of the<br/>
Rio Grande through El Paso/Ciudad Juárez.   You can view this description in the<br/>
left column of PDF page 7 of the Convention at <a rel="nofollow" target="_blank" href="http://tinyurl.com/3equm">http://tinyurl.com/3equm</a> [heavy<br/>
download].  Each of the major curves in the new channel as shown on the<br/>
non-technical map at <a rel="nofollow" target="_blank" href="http://tinyurl.com/2n6gg">http://tinyurl.com/2n6gg</a> is specified as an arc, even if<br/>
not perfectly depicted as such on the map.<br/>
<br/>
Lowell G. McManus<br/>
Leesville, Louisiana, USA</div>