US border wall faces all kinds of obstacles

WASHINGTON: President Donald Trump has now laid out exactly what he wants in the “big, beautiful wall” that he has promised to build on the US-Mexico border. But his effort to build a huge barrier to those attempting to enter the US illegally faces impediments of its own.

It’s still not clear how Trump will pay for the wall that, as described in contracting notices, would be 30 feet (9 meters) high and easy on the eye for those looking at it from the north. The Trump administration will also have to contend with unfavorable geography and many legal battles.

A look at some of those obstacles:

Roughly half of the 2,000-mile (3,200-kilometer) US-Mexico border is in Texas and marked by the winding and twisting Rio Grande. A 1970 treaty with Mexico requires that anything built near that river not obstruct its flow. The same treaty applies to a stretch of border in Arizona, where the Colorado River marks the international boundary.

Some fencing that is already in place along the frontier is built well off the river, in some places nearly a mile (about a kilometer) away from the border.

Trump will have to navigate not only the treaty maintained by the International Boundary and Water Commission (IBWC) but also various environmental regulations that protect some stretches of border and restrict what kind of structures can be built and where. The contracting notices of March 17 say the Trump administration wants the wall dug at least 6 feet (almost 2 meters) into the ground.

Along parts of the border in California, environmentally sensitive sand dunes required that a “floating fence” was built to allow the natural movement of the sand.