- Associated Press - Wednesday, July 7, 2010

NUEVO LAREDO, Mexico (AP) — Drenching storms have raised reservoirs along the U.S.-Mexico border to their highest levels in decades, forcing officials to dump water into flooded rivers on Wednesday and evacuate tens of thousands of people from homes, with yet another storm on the way.

The dramatic rise of the Rio Grande caused by Hurricane Alex and continuing rains forced the closure of at least one major border crossing between downtown Laredo, Texas, and Nuevo Laredo, Mexico.

Officials evacuated the flood-threatened Vega Verde subdivision in Del Rio, Texas, some 110 miles (180 kilometers) upstream from Laredo, while high waters in the northern Mexican state of Coahuila have already damaged some 10,000 homes — many swamped in waist-deep water.

“That means there are 40,000 people who don’t have any place to sleep,” Gov. Humberto Moreira told the Televisa network on Wednesday.

To the southeast, Mexican officials evacuated nearly 18,000 people from houses in Ciudad Anahuac for fear that water would overflow the Venustiano Carranza dam and threaten lives. Mexico’s National Water Commission said the dam currently had the largest emergency water release in the country.

Ciudad Anahuac Mayor Santos Garza Garcia said at least 1,500 homes already had been flooded in the town of Rodriguez, across the Salado River from his city.

Water behind the binational Amistad Dam on the Rio Grande was at its highest level since 1974, according to the International Boundary and Water Commission, forcing officials to release water from it at the fastest rate in a quarter century.

The Commission said the downstream Falcon dam would probably reach capacity within the next few days, suggesting future releases there will raise water levels along the river’s lower reaches.

Much of that downstream area is protected against flooding by levees, but Mexico’s National Water Commission said it was worried about low-lying settlements, most built by poor people without official permission.

“One of country’s most serious problems are irregular settlements on federal land and in flood-prone areas,” it said.

Authorities walked a painful, delicate line — forced to release reservoir waters they know will add to flooding in hopes of avoiding worse disasters.

It was an unusual state of affairs in a semiarid region where Mexican and U.S. officials often squabble over rights to scarce water.

Mayor Garza Garcia said 20 floodgates had been opened by late Tuesday at the Venustiano Carranza Dam, which was releasing 600 cubic meters (21,190 cubic feet) per second into the Salado River, a tributary of the Rio Grande.

“It was preferable having controlled flooding than having the whole town disappear,” Garza Garcia said. “The situation is very critical.”

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