NPR

Mexico Worries That A New Border Wall Will Worsen Flooding

The 1970 Boundary Treaty requires U.S. and Mexican officials on the International Boundary and Water Commission be in agreement before building structures that might affect the flow of the Rio Grande.
Antonio Rascón, chief engineer of the Mexican section of International Boundary and Water Commission, says the U.S. has already built nearly 700 miles of security fence and Mexico has consistently opposed it.

As the White House pushes Congress to fund President Trump's U.S.-Mexico border wall, a new wrinkle has emerged that could stymie parts of the massive project.

Mexican engineers believe construction of the border barrier may violate a 47-year-old treaty governing the shared waters of the Rio Grande. If Mexico protests, the fate of the wall could end up in an international court.

Antonio Rascón, chief Mexican engineer on the International Boundary and Water Commission, said in an interview with NPR that some border wall proposals he's seen would violate the treaty, and that Mexico would not stand for that.

"A concrete wall that blocks trans-border water movement is a total obstruction. If they plan that type of project, we will oppose it," he said in

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