The Phenomenon of Ground Subsidence Ground subsidence is a natural process that has become a pressing concern in Mexico City.
Severe storms dumped about half a year’s rainfall in two days, leading to flash floods across both sides of the border.
More than 20 inches of rain — about a half-year’s worth — fell in some areas near the border on Thursday and Friday.
Alamo emergency responders handled more than 100 water rescues, including people trapped in homes and stranded in vehicles.