[SunkenCiv]

http://structurae.net/structures/sadd-el-kafara-dam

http://www.shutterstock.com/video/clip-3968275-stock-footage-scenic-shots-of-the-remains-of-the-saad-el-kafara-dam-in-helwan-egypt-the-oldest-known-high-dam.html

http://www.google.com/search?q=Sadd-el-Kafara&btnG=Search

images:

http://www.google.com/search?q=Sadd-el-Kafara&btnG=Search&sa=X&oi=image_result_group&tbm=isch

[Abathar]

William Mulholland must not have studied these when he designed the St. Francis dam, a couple of the Roman dams are still in use today.