1.When rivers go over their banks, the spreading water immediately slows up, dro
ID: 291634 • Letter: 1
Question
1.When rivers go over their banks, the spreading water immediately slows up, dropping the heavier sediments. The finer the silt, the farther it is scattered, but so much falls close to the river that natural levees rise through time. The first houses of New Orleans were built on the natural levees, overlooking the river. In the face of disaster, there was no better place to go. If there was to be a New Orleans, the levees themselves would have to be raised, and the owners of the houses were ordered to do the raising.
2. Floods
When high water overflows the natural banks of a river
Rated statistically for the expected time between them
1993 and 2011 Mississippi River floods surpassed 1000-yr probability
Same for the 2005 Hurricane Katrina events
A 10-year flood is expected to occur 10 times a century so there is a 10% change of it happening in any one year
What is the relationship between these two paragraphs?
Explanation / Answer
ANSWER- The relationship between these two paragraphs is that the sediment load that the river Mississippi carries is the one out of which levees in the new Orleans are made up of.The mississippi river which is the longest river in the world carries around 230 million tons of sediment,also ranking sixth in silt load in the world.Levee construction along the river is common as is seen in New Orleans(near lower Mississippi) since the settlers came since many decades.Level construction is basically to control the floods from affecting the region beyond it.However over 50 levees failures and flood walls protecting New Orleans following the passage of 2005 Hurricane Katrina events.
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