TUCSON - Environmentalists say flooding caused by a newly built border-security fence during a July monsoon bears out their concerns and warnings about the adverse environmental impacts of the government's rush to build fences.

The immediate case in point centers around fencing built on the Organ Pipe Cactus National Monument in southwestern Arizona. Officials say the design of the fence between the U.S. and Mexico caused debris and water backup during a July 12 storm that led to flooding at the port of entry at Lukeville and Sonoyta, Mexico. MORE