Alluvioni e maltempo in California

L’ambiente è un sistema complesso. La perdita della copertura boschiva, causata dai recenti incendi, ha indebolito la tenuta idrogeologica del territorio in California, moltiplicando gli effetti negativi delle inondazioni (Foto AP).

In this photo provided by Santa Barbara County Fire Department,   mud and debris flow on the roadway due to heavy rain in Montecito. Calif., Tuesday, Jan. 9, 2018.   Heavy rains pounding Southern California for a second day are causing floods and loosening hillsides as officials in fire-ravaged communities warn people to stay off roads over fears of mud and debris flows. (Mike Eliason/Santa Barbara County Fire Department via AP)
In this photo provided by Santa Barbara County Fire Department, the main line of the Union Pacific Railroad through Montecito, Calif, is blocked with mudflow and debris due to heavy rains on Tuesday, Jan. 9, 2018. Several homes were swept away before dawn Tuesday when mud and debris roared into neighborhoods in Montecito from hillsides stripped of vegetation during a recent wildfire. (Mike Eliason/Santa Barbara County Fire Department via AP)
In this photo provided by the Santa Barbara County Fire Department, shows a semi-tractor trailer sits stuck in mud on U.S. Highway 101, in Montecito, Calif. on Tuesday, Jan. 9, 2018. Homes were swept away before dawn Tuesday when mud and debris roared into neighborhoods in Montecito from hillsides stripped of vegetation during a recent wildfire. (Mike Eliason/Santa Barbara County Fire Department via AP)
In this photo provided by Santa Barbara County Fire Department, shows a rainbow forming above Montecito, Calif. while law enforcement and the curious survey the destruction on Hot Springs Road on Tuesday, Jan. 9, 2018. Homes were swept away before dawn Tuesday when mud and debris roared into neighborhoods in Montecito from hillsides stripped of vegetation during a recent wildfire. (Mike Eliason/Santa Barbara County Fire Department via AP)
A Tesla sits in mud at a housing complex in Montecito, Calif., Tuesday, Jan. 9, 2018. Dozens of homes were swept away or heavily damaged Tuesday as downpours sent mud and boulders roaring down hills stripped of vegetation by a gigantic wildfire that raged in Southern California last month. (AP Photo/Michael Owen Baker)
This photo provided by the Santa Barbara County Fire Department shows the sun setting over the flooded US 101 Freeway at Olive Mill Road, which remains flooded with runoff water from Montecito Creek in Montecito, Calif., Tuesday, Jan. 9, 2018. Several homes were swept away before dawn Tuesday when mud and debris roared into neighborhoods in Montecito from hillsides stripped of vegetation during the Thomas wildfire. (Mike Eliason/Santa Barbara County Fire Department via AP)
This photo provided by the Santa Barbara County Fire Department shows the U.S. Highway 101 at the Olive Mill Road overpass flooded with runoff water from Montecito Creek in Montecito, Calif., Tuesday, Jan. 9, 2018. Dozens of homes were swept away or heavily damaged Tuesday as downpours sent mud and boulders roaring down hills stripped of vegetation by a gigantic wildfire that raged in Southern California last month. (Mike Eliason/Santa Barbara County Fire Department via AP)
A man who gave his name only as Ian rides his bike through a mud puddle in Montecito, Calif., Tuesday, Jan. 9, 2018. More than a dozen people were killed and homes were torn from their foundations Tuesday as downpours sent mud and boulders roaring down hills stripped of vegetation by a wildfire that raged in Southern California last month. (AP Photo/Michael Owen Baker)
Cars that were washed away are piled up on the banks of Romero Creek in Montecito, Calif., Tuesday, Jan. 9, 2018. Dozens of homes were swept away or heavily damaged Tuesday as downpours sent mud and boulders roaring down hills stripped of vegetation by a gigantic wildfire that raged in Southern California last month. (AP Photo/Michael Owen Baker)
A large boulder sits in the middle of Bella Vista Drive in Montecito, Calif., following the rain storm, Tuesday, Jan. 9, 2018. (AP Photo/Michael Owen Baker)
Carpinteria resident Jeff Gallup carries his bike through mud on Foothill Road in Carpinteria, Calif., Tuesday, Jan. 9, 2018. Homes were swept from their foundations as heavy rain sent mud and boulders sliding down hills stripped of vegetation by Southern California's recent wildfires. (AP Photo/Michael Owen Baker)
In this photo provided by Santa Barbara County Fire Department, the main line of the Union Pacific Railroad through Montecito, Calif, is blocked with mudflow and debris due to heavy rains on Tuesday, Jan. 9, 2018. Several homes were swept away before dawn Tuesday when mud and debris roared into neighborhoods in Montecito from hillsides stripped of vegetation during a recent wildfire. (Mike Eliason/Santa Barbara County Fire Department via AP)
In this photo provided by the Santa Barbara County Fire Department, shows a semi-tractor trailer sits stuck in mud on U.S. Highway 101, in Montecito, Calif. on Tuesday, Jan. 9, 2018. Homes were swept away before dawn Tuesday when mud and debris roared into neighborhoods in Montecito from hillsides stripped of vegetation during a recent wildfire. (Mike Eliason/Santa Barbara County Fire Department via AP)
In this photo provided by Santa Barbara County Fire Department, shows a rainbow forming above Montecito, Calif. while law enforcement and the curious survey the destruction on Hot Springs Road on Tuesday, Jan. 9, 2018. Homes were swept away before dawn Tuesday when mud and debris roared into neighborhoods in Montecito from hillsides stripped of vegetation during a recent wildfire. (Mike Eliason/Santa Barbara County Fire Department via AP)
Montecito resident Donald Crouse surveys the damage on East Valley Road in Montecito, Calif., where utility lines fell onto a bridge during the rain storm, Tuesday, Jan. 9, 2018. (AP Photo/Michael Owen Baker)
In this photo provided by Santa Barbara County Fire Department,   mud and debris flow on the roadway due to heavy rain in Montecito. Calif., Tuesday, Jan. 9, 2018.   Heavy rains pounding Southern California for a second day are causing floods and loosening hillsides as officials in fire-ravaged communities warn people to stay off roads over fears of mud and debris flows. (Mike Eliason/Santa Barbara County Fire Department via AP)
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