exposed, lower channel...ca. 1-2 meters lower in elevation. Of course the structure would have still been subject to inundation during heavy rainfall events (which is also the case now), but, because of the infrequency of this happening (assuming there was was a relatively dry climate during the period of utilization), the relative ease of removing the debris, and the nice, flat, slab the limestone valley floor (perfect for carving this structure) provided, made the former worth the benefit.

http://cayman.globat.com/~bandstexas.co ... t%2061.jpg

http://cayman.globat.com/~bandstexas.co ... t%2037.jpg








These guys appeared to be very intelligent, taking into account they didn't have the history of technology to fall back on like we do.
That's my take on it to date...
