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Hurricane Katrina Case Study

Hurricane Katrina is tied with Hurricane Harvey (2017) as the costliest hurricane on record. Although not the strongest in recorded history, the hurricane caused an estimated $125 billion worth of damage. The category five hurricane is the joint eight strongest ever recorded, with sustained winds of 175 mph (280 km/h).

The hurricane began as a very low-pressure system over the Atlantic Ocean. The system strengthened, forming a hurricane that moved west, approaching the Florida coast on the evening of the 25th August 2005.

A satellite image of Hurricane Katrina.

Hurricane Katrina was an extremely destructive and deadly Category 5 hurricane. It made landfall on Florida and Louisiana, particularly the city of New Orleans and surrounding areas, in August 2005, causing catastrophic damage from central Florida to eastern Texas. Fatal flaws in flood engineering protection led to a significant loss of life in New Orleans. The levees, designed to cope with category three storm surges, failed to lead to catastrophic flooding and loss of life.

What were the impacts of Hurricane Katrina?

Hurricane Katrina was a category five tropical storm. The hurricane caused storm surges over six metres in height. The city of New Orleans was one of the worst affected areas. This is because it lies below sea level and is protected by levees. The levees protect the city from the Mississippi River and Lake Ponchartrain. However, these were unable to cope with the storm surge, and water flooded the city.

$105 billion was sought by The Bush Administration for repairs and reconstruction in the region. This funding did not include potential interruption of the oil supply, destruction of the Gulf Coast’s highway infrastructure, and exports of commodities such as grain.

Although the state made an evacuation order, many of the poorest people remained in New Orleans because they either wanted to protect their property or could not afford to leave.

The Superdome stadium was set up as a centre for people who could not escape the storm. There was a shortage of food, and the conditions were unhygienic.

Looting occurred throughout the city, and tensions were high as people felt unsafe. 1,200 people drowned in the floods, and 1 million people were made homeless. Oil facilities were damaged, and as a result, the price of petrol rose in the UK and USA.

80% of the city of New Orleans and large neighbouring parishes became flooded, and the floodwaters remained for weeks. Most of the transportation and communication networks servicing New Orleans were damaged or disabled by the flooding, and tens of thousands of people who had not evacuated the city before landfall became stranded with little access to food, shelter or basic necessities.

The storm surge caused substantial beach erosion , in some cases completely devastating coastal areas.

Katrina also produced massive tree loss along the Gulf Coast, particularly in Louisiana’s Pearl River Basin and among bottomland hardwood forests.

The storm caused oil spills from 44 facilities throughout southeastern Louisiana. This resulted in over 7 million US gallons (26,000 m 3 ) of oil being leaked. Some spills were only a few hundred gallons, and most were contained on-site, though some oil entered the ecosystem and residential areas.

Some New Orleans residents are no longer able to get home insurance to cover them from the impact of hurricanes.

What was the response to Hurricane Katrina?

The US Government was heavily criticised for its handling of the disaster. Despite many people being evacuated, it was a very slow process. The poorest and most vulnerable were left behind.

The government provided $50 billion in aid.

During the early stages of the recovery process, the UK government sent food aid.

The National Guard was mobilised to restore law and order in New Orleans.

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Case Study – Hurricane Katrina

At least 1,500 people were killed and around $300 billion worth of damage was caused when Hurricane Katrina hit the south-eastern part of the USA. Arriving in late August 2005 with winds of up to 127 mph, the storm caused widespread flooding. 

Physical impacts of Hurricane Katrina

Flooding Hurricanes can cause the sea level around them to rise, this effect is called a storm surge. This is often the most dangerous characteristic of a hurricane, and causes the most hurricane-related deaths. It is especially dangerous in low-lying areas close to the coast.

There is more about hurricanes in the weather section of the Met Office website https://www.metoffice.gov.uk/research/weather/tropical-cyclones/facts

Hurricane Katrina tracked over the Gulf of Mexico and hit New Orleans, a coastal city with huge areas below sea-level which were protected by defence walls, called levees. The hurricane’s storm surge, combined with huge waves generated by the wind, pushed up water levels around the city.

The levees were overwhelmed by the extra water, with many collapsing completely. This allowed water to flood into New Orleans, and up to 80% of the city was flooded to depths of up to six metres.

Hurricane Katrina also produced a lot of rainfall, which also contributed to the flooding.

In pictures

Strong winds The strongest winds during 25-30 August were over the coastal areas of Louisiana and Florida. A map of the maximum wind speeds which were recorded during the Hurricane Katrina episode is shown. Although the winds did not directly kill many people, it did produce a storm surge over the ocean which led to flooding in coastal areas and was responsible for many deaths.

Satellite Image

Illustration

Tornadoes Hurricanes can create tornadoes. Thirty-three tornadoes were produced by Hurricane Katrina over a five-day period, although only one person died due to a tornado which affected Georgia.

Impact on humans

• 1,500 deaths in the states of Louisiana, Mississippi and Florida.
• Costs of about $300 billion.
• Thousands of homes and businesses destroyed.
• Criminal gangs roamed the streets, looting homes and businesses and committing other crimes.
• Thousands of jobs lost and millions of dollars in lost tax incomes.
• Agricultural production was damaged by tornadoes and flooding. Cotton and sugar-cane crops were flattened.
• Three million people were left without electricity for over a week.
• Tourism centres were badly affected.
• A significant part of the USA oil refining capacity was disrupted after the storm due to flooded refineries and broken pipelines, and several oil rigs in the Gulf were damaged.
• Major highways were disrupted and some major road bridges were destroyed.
• Many people have moved to live in other parts of the USA and many may never return to their original homes.

The broken levees were repaired by engineers and the flood water in the streets of New Orleans took several months to drain away. The broken levees and consequent flooding were largely responsible for most of the deaths in New Orleans. One of the first challenges in the aftermath of the flooding was to repair the broken levees. Vast quantities of materials, such as sandbags, were airlifted in by the army and air force and the levees were eventually repaired and strengthened.

Although the USA is one of the wealthiest developed countries in the world, it highlighted that when a disaster is large enough, even very developed countries struggle to cope.

Weather Map

Web page reproduced with the kind permission of  the Met Office

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Hurricane Katrina: Responding to an "Ultra-Catastrophe" in New Orleans (B)

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Abstract: When Hurricane Katrina slammed into the Gulf Coast on Monday morning, August 29, it cut a wide swath of destruction in the area; but despite inflicting enormous damage, it initially appeared that the storm had spared low-lying New Orleans the worst of its wrath. But as Katrina moved on, it soon became clear to those who had not evacuated the city that something was going very wrong: almost every part of New Orleans began to flood, and by the next day roughly 80 percent of it would be under water. The rapidly rising floodwaters, the result of three major breaches in the levees protecting the city, created a massive humanitarian crisis. Tens of thousands of residents escaped to rooftops or attics, where they waited anxiously for rescue, or waded in waist-deep water to find shelter; many went to the Superdome, which was already packed with people who had waited out the storm there, or to other improvised shelters in the city. As the days dragged on, it would become increasingly apparent that almost every aspect of the response from state, local, and federal government was falling far short of what was needed: evacuees languished in squalid shelters or on highway overpasses waiting for buses that did not come; looting and more serious crimes were reported to be rampant; food, water, and medical care were in short supply. As public outrage grew, fed by TV footage of distraught storm victims, emergency response officials and political leaders, all the way up to President George W. Bush, found themselves scrambling to cope with the "ultra-catastrophe" that Katrina had visited on New Orleans. Learning Objective: The case provides an opportunity to consider the operational issues of emergency response, particularly the problems of interagency, interjurisdictional, and intergovernmental coordination in an environment where infrastructure and communications systems had been almost entirely destroyed. Used in tandem with Part A, the case provides a before-and-after look at the response to Katrina, but it can also be taught as a freestanding case.

Other Details

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Hurricane Katrina: Responding to an "Ultra-Catastrophe" in New Orleans (Abridged) (C)

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"Broadmoor Lives": A New Orleans Neighborhood's Battle To Recover from Hurricane Katrina (A)

Hurricane Katrina: Preparing for “The Big One” in New Orleans (Abridged) (A)

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Impact of tropical cyclones/hurricanes - Katrina case study

Subject: Geography

Age range: 14-16

Resource type: Lesson (complete)

Last updated

30 March 2021

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Hurricane - formation, impact and management

This is one of the most active and destructive hurricane season in the Atlantic Ocean area on records. Thousands of people (including British nationals) have been affected by hurricanes this hurricane season. There is never a better opportunity to teach about hurricanes whether or not it's on your LS for T1. Here we have three (3) lessons that explore the science behind hurricane formation, an analysis of the social and economic impact of hurricanes and finally a look at ways hurricanes can be managed to minimise the loss of lives. All the resources to deliver the lessons are included with the lessons. Just download and teach.

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