New Orleans: Torrential rain dumped by Hurricane Isaac threatened
to burst a dam in Mississippi on Thursday, triggering the mass
evacuation of local residents, while large areas of the region were
still flooded and without power but getting ready to mop up.
Isaac,
which was downgraded to a tropical depression on Thursday, did little
damage to New Orleans, where stronger barriers were installed after
Hurricane Katrina in 2005. Only one fatality linked to the storm has
been confirmed so far.
But it produced a soggy mess across
widespread areas of the US Gulf Coast and could still bring heavy
downpours and flooding before moving into the central United States -
where rain is badly needed - over the next few days.
Some 700,000 homes and businesses in Louisiana and Mississippi were
still without power on Thursday, down from about 1 million overnight. As
winds subsided, crews were able to start assessing damage.
While
New Orleans and the coast got started with clean-up, new worries
developed about a potential failure of Lake Tangipahoa Dam in
Mississippi's Percy Quin State Park.
Authorities ordered the
immediate evacuation of tens of thousands of residents in nearby
communities in Louisiana and Mississippi as a protective measure.
The
earthen dam, in Pike County, is about 100 miles (160 kilometers) north
of New Orleans. It was damaged, but not breached, Wednesday night's
tumultuous downpours.
Heavy equipment and pumps were brought in
to start a controlled water release to the Tangipahoa River, relieving
pressure on the dam.
"Every precaution is being taken to protect the safety of the people and property," said Mississippi Governor Phil Bryant.
Ken
Graham, forecaster with the National Weather Service in New Orleans,
said the Tangipahoa River near Kentwood - hometown of pop singer Britney
Spears - is already 14 feet (4.3 metres) above flood stage and is
expected to rise to 16 feet (4.9 meters) by Friday morning.
"That takes it to a pretty big flood event, and that's just from the rain," he said.
Additional
heavy rain is not expected as the remnants of Isaac move away, but the
National Weather Service said the dam "may potentially fail" and is
keeping a flash flood watch in effect for Pike Country through 5 p.m. ET
(2100 GMT) on Friday.
State officials were at odds about the
risks posed by the dam. Louisiana Governor Bobby Jindal warned of
potential "record flooding" downstream, while officials in Mississippi
downplayed the possibility of a dangerous water release.
"Even if
that dam would have a catastrophic break, the flood plain in Pike
County would be able to handle it, so it would not significantly affect
the river," said Greg Flynn, spokesman from the Mississippi Emergency
Management Agency. "They don't expect any wall of water to go down the
river."
Damage assessmentsIn areas struck earlier by Isaac, the process of checking for damage and restoring halted operations began.
The
oil and gas industry in the Gulf of Mexico has so far reported no major
storm-related damage to infrastructure although one Louisiana refinery
has had flooding.
Energy production was expected to start ramping
up again, after nearly grinding to a halt as Isaac closed in on
Louisiana on Tuesday. Benchmark Brent crude was little changed in
Thursday afternoon trading at about $112.75 a barrel.
Multibillion-dollar
defenses built to protect New Orleans itself, after it was ravaged by
Katrina almost exactly seven years ago, passed their first major test,
according to the US Army Corps of Engineers. "The levees worked," Jindal
said.
Among the items spared in the storm were thousands of bags
of green coffee stored in New Orleans warehouses that had sustained
damage during Katrina.
"No major damage to the buildings and no
damage to stored product," Allan Colley, president of Dupay Storage and
Forwarding, said in an email.
Dusk-to-dawn curfews, designed to
help prevent any repeat of the looting that occurred in New Orleans in
the days after Katrina struck in 2005, were lifted on Thursday.
Only
about a dozen looting-related arrests were reported in the city by
Thursday morning but the streets were unusually quiet, still littered
with downed branches, fallen trees and pieces of roofing material.
In
the historic French Quarter, a few people were out taking down the
boards they had nailed up over store windows. Officials urged patience
and good humour during the clean-up.
"Our tempers tend to flare,"
said New Orleans Councilwoman Cynthia Hedge Morrell at the news
conference. "My advice would be sit on the front porch and talk to your
neighbours. That's what New Orleans is known for.
Surrounding parishes hitBut
massive rains and storm surge from the Gulf inundated low-lying
communities outside the federal flood containment system protecting New
Orleans, forcing the evacuation of thousands of people from their homes
and some dramatic rooftop rescue operations.
Hardest hit was
Plaquemines Parish, southeast of New Orleans, where floodwaters
overtopped at least one levee on Wednesday and left many homes under
about 12 feet (3.6 m) of water. Dozens of residents who had attempted to
ride out the storm had to be plucked from their rooftops.
In
Slidell, a town of about 27,000 people northeast of New Orleans, the
surge from Lake Pontchartrain left the Eden Isle community under about a
foot (30 cm) of water.
"You'd have never made me believe a
Category 1 would dump this much water," said Sam Caruso, 71," a former
mayor of the town who was touring it in his pickup truck.
National
Guard troops and police moved into the town Thursday afternoon as some
local residents navigated flooded streets in boats. Overall, troops have
rescued or evacuated more than 3,000 Louisiana residents and three
tractor-trailer loads of pets, Jindal said.
Drought reliefAs
the focus on Isaac shifted from the coast, many in its projected path
further north have been praying it will bring rain desperately needed to
ease a drought. Summer crops are in tatters and many rivers and dams
are critically low.
Isaac never came close to the power of
Katrina, which was a Category 3 hurricane on the five-step
Saffir-Simpson scale when it smashed into New Orleans on August 29,
2005.
But US President Barack Obama still declared the impact on
Louisiana and Mississippi major disasters and ordered federal aid to
supplement state and local recovery efforts.
© Thomson Reuters 2012