EARTH SCIENCE
NATURAL HAZARDS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The engineers design was poorly made
|
|
|
The calculations of how much water they needed to hold were incorrectly done
|
|
|
The engineers didn’t predict that a storm as big as Katrina would ever hit
|
|
|
Sometimes levees just fail.
|
Detailed explanation-1: -Rather than a few breaches through the floodwalls in the city caused largely by overtopping, we found literally dozens of breaches throughout the many miles of levee system. A number of different failure mechanisms were observed, including scour erosion caused by overtopping, seepage, soil failure, and piping.
Detailed explanation-2: -Overall, approximately 28 levee failures were reported. A breach in the Industrial Canal, near the St. Bernard/ Orleans parish line, occurred at approximately 9:00 AM CST, the day Katrina hit.
Detailed explanation-3: -Hurricane Katrina made landfall in the early morning of August 29, 2005, in southeast Louisiana to the east of New Orleans. Throughout the area, levees and flood walls failed or were breached in more than 50 locations.
Detailed explanation-4: -1717 to 1727-The French built the first man-made levee system near New Orleans. The levee measured only three feet in most locations and failed to contain the river during periods of heavy flooding.