New Orleans on September 9, 2005. Crews worked on areas where there had been breaks in the levee in order to avoid additional flooding. (Photo by Jocelyn Augustino, courtesy of FEMA)
Four years after Katrina, the
levees around New Orleans are
still being constructed. But
a report by the National Academy
of Sciences says the city shouldn’t
think of the levees as a cure-all.
Mark Brush has more:
Transcript
Four years after Katrina, the
levees around New Orleans are
still being constructed. But
a report by the National Academy
of Sciences says the city shouldn’t
think of the levees as a cure-all.
Mark Brush has more:
Hurricane Katrina was one of the worst natural disasters in U.S. history. A big reason it was so bad is because the levees holding back the water crumbled.
There’s a big effort to build up the levee system, but the National Academy of Sciences says the city should not solely rely on levees to protect it.
Jeff Jacobs headed up the report for the National Academy.
“There is no levee system that can provide absolute protection. There’s always the danger of over-topping. And there’s always a possibility of levee failure. And that holds true for the best maintained and the best inspected levee systems in the world.”
The New Orleans area has a particular problem. The ground can sink over time. That’s not good for levees.
The Academy recommends that people relocate to safer areas. Or, if people are going to stay, that homes be elevated – so that the first floor of a home is higher than the floodwater.
Shrimpers have seen their catches dwindle down from thousands of pounds of shrimp a day to very little due to the dead zone in the Gulf of Mexico. (Photo by Samara Freemark)
Of course, the bigger the zone, the further out shrimpers have to send their boats. That means a lot of wasted time, fuel, and wages. (Photo by Samara Freemark)
Every summer, thousands of
square miles of the Gulf of
Mexico die. The Dead Zone is
caused by pollution that flows
down the Mississippi River. It’s
runoff from factories, sewer
plants, and farms. And it causes
a lot of problems for fishermen
in the area. This year, the Dead
Zone is projected to be huge –
maybe the largest ever. Samara Freemark explains:
Transcript
Every summer, thousands of
square miles of the Gulf of
Mexico die. The Dead Zone is
caused by pollution that flows
down the Mississippi River. It’s
runoff from factories, sewer
plants, and farms. And it causes
a lot of problems for fishermen
in the area. This year, the Dead
Zone is projected to be huge –
maybe the largest ever. Samara Freemark explains:
Imagine for a moment you’re a shrimp fisherman. Every day you send out your fleet to the same waters you’ve fished for decades. And your boats pull in a lot of shrimp- thousands of pounds a day, millions a year. And then one day, a normal summer day, you send the boats out, and they come back empty.
“You go from about 5000 pounds to nothing. It’s dead. That’s why they call it the dead zone.”
That’s Dean Blanchard. He runs the largest shrimp company in America- Dean Blanchard Seafood.
Blanchard started seeing the dead zone about five years ago, but it’s not a new phenomenon. For a long time, nutrient fertilizer from upstream has run into the Mississippi River and from there, into the Gulf. It fertilizes big algae blooms– and when the algae decays, it sucks oxygen out of the water, making it impossible for fish to live there.
What’s new is how much fertilizer there is now.
“It’s not natural.”
Nancy Rabalais is a marine biologist at LUMCON. That’s Louisiana’s center for marine research. She says that over the past several decades there’s been a surge in fertilizer use in the Corn Belt states. That eventually ends up in the Gulf.
“We’re having 300 times more than we did in the 1950s. And it’s just over loaded the system.”
Rabalais predicts this year’s dead zone will be almost three times as big as it was twenty years ago – more than 8000 square miles.
Of course, the bigger the zone, the further out shrimpers like Dean Blanchard have to send their boats. That means a lot of wasted time, fuel, and wages.
And the zones might mean even bigger problems. Don Scavia is a professor at the School of Natural Resources at the University of Michigan.
“There’s a half a billion dollar shrimp industry in the gulf. And the shrimp depend on that habitat. And what we’re concerned about is that if the dead zone continues or even grows, that fishery may collapse.”
Congress is taking some measures to address the problem. Conservation programs in the Farm Bill work to reduce how much fertilizer farmers use, and how they apply it.
But there’s something else in the Farm Bill too – a lot of subsidy programs. Those pay for ethanol production. Which means more corn. Which means a lot more fertilizer.
“And what is debated every 5 years is how much funding will go into those conservation programs, relative to funding going into subsidy programs. And, by far, the subsidies win.” (laughs)
Scavia says for every $1 spent on conservation programs in the Corn Belt, $500 go to subsidizing crops.
Shrimper Dean Blanchard says he’s not sure how long he can live with that balance, especially as he watches the dead zone grow.
“How big is this thing going to get? If we kill the oceans we have problems. We have serious problems.”
But Don Scavia is hopeful. He says we know exactly how to reduce nutrient runoff – in fact, the basic programs are already in place. It’s just a matter of Congress choosing the right funding priorities.
It is predicted that the dead zone in the Gulf of Mexico is the size of the state of Massachusetts (Photo courtesy of NASA)
A scientific panel wants two
federal agencies to start working together,
to reduce pollution. Fertilizer pollution
is causing problems for the Mississippi
River system and contributing to a ‘Dead
Zone’ in the Gulf of Mexico. Chuck Quirmbach
reports:
Transcript
A scientific panel wants two
federal agencies to start working together,
to reduce pollution. Fertilizer pollution
is causing problems for the Mississippi
River system and contributing to a ‘Dead
Zone’ in the Gulf of Mexico. Chuck Quirmbach
reports:
Nitrogen and phosphorus come from fertilizers used on lawns and farm fields. The chemicals
pollute water throughout the Mississippi River Basin and down to the Gulf of Mexico. The
National Research Council has been studying the problem.
David Dzombak is an Engineering Professor at Carnegie Mellon University, and helped the
council write a new report. He says the biggest recommendation is for the US Environmental
Protection Agency and the US Department of Agriculture to team up.
“This is a very large scale problem. It’s taken many years to develop and will take many years to
turn around.”
And Dzombak says the two agencies need to get started. The report recommends the federal
agencies work with states to restrict the amount of fertilizer that can go into streams and rivers. It
also calls for a network of experiments to filter or buffer the fertilizer runoff in badly-polluted
watersheds.
New Orleans on September 9, 2005. Crews worked on areas where there had been breaks in the levee in order to avoid additional flooding. (Photo by Jocelyn Augustino, courtesy of FEMA)
