Trump’s Border Wall Could Trouble Waters With Mexico

A wall covered with solar panels may be President Donald Trump’s solution to keep undocumented immigrants and illegal drugs out of the country, but critics say it also could cause flooding and stormwater runoff problems along the 2,000-mile U.S.-Mexico border.

The proposed wall could adversely affect three major rivers—the Rio Grande, Colorado, and Tijuana—and their tributaries that crisscross the border, according to Mexico-focused scholars and environmental advocates. Use and protection of these waters are governed by treaties that date as far back as the late 19th century.

The Department of Homeland Security hasn’t announced which company or companies will be ...