"This report discusses analyses of several fencing system options that would provide both effective and minimum life-cycle cost service for primary, secondary, and tertiary barrier needs. […] The Immigration and Naturalization Service (INS) is responsible for the administration and enforcement of U.S. immigration laws. Enforcement mainly involves apprehending illegal immigrants and assisting with the interdiction of illegal drug smugglers and suspected terrorists. The United States has approximately 6,000 miles of land-based international border. By far the largest problem with illegal immigration occurs along the 2,000 miles of border with Mexico. Along this border, nearly 90 percent of the apprehensions occur along 200 miles distributed near nine major U.S. cities and towns such as San Diego, CA, and El Paso, TX. Current fencing, where it exists, is often in a severe state of disrepair. To cost effectively increase deterrence against illegal entry, the INS is considering the widespread application of several different fencing systems for these high traffic areas. Little to no detailed engineering-based comparisons have been made for these fencing options so no basis currently exists with which to make an informed decision based on reliability, effectiveness of deterrence, economics, and ability to withstand attack."
USACERL Technical Report 99/28
Government Printing Office: http://www.gpoaccess.gov/