Its reported 40-foot earthen wall, rings of air defenses and other security measures are fairly compelling, albeit circumstantial, evidence of the purposes to which it will be put.

CENTERFORSECURITYPOLICY: Center for Security Policy | Submitted Testimony Of Frank J. Gaffney, Jr. Before A Joint Hearing Of The Senate Governmental Affairs Committee And The Permanent Subcommittee On Investigations

Mr. DAVID DANIEL (President, University of Texas, Dallas): 17th Street canal consists of an earthen levee, which is just a long embankment of earth, that has a wall sticking up right in the middle of it.

NPR: Panel's Report Assigns No Blame in Levee Failures