The researchers are aware that eliminating the human -
made levees on the west bank might potentially endanger the few sparsely populated areas along the lower west bank of the Mississippi.
«By eliminating the 55 kilometers of human -
made levees on the west bank of the river from Pointe a la Hache and Venice, the surges propagating in the river from Pointe a la Hache past New Orleans will be lowered by up to two meters,» Westerink said.
As an alternative, the study shows that the lowering of human -
made levees along the Lower Plaquemines river section to their natural state, to allow storm surge to partially pass across the Mississippi River, will decrease storm surge upriver toward New Orleans.
Not exact matches
Before Katrina
made landfall, the
levees broke.
It also suggests that the Chinese government's long - running efforts to tame the Yellow River with
levees, dikes and drainage ditches actually
made periodic flooding much worse, setting the stage for a catastrophic flood circa A.D. 14 - 17, which likely killed millions and triggered the collapse of the Western Han Dynasty.
Higher
levees in some areas
make flooding worse in other areas, and development continues behind all the berms
Scientists at the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science found that human -
made canals limit the natural tidal inundation process in roughly 45 percent of the state's coastline, and disruptions from
levees accounted for 15 percent.
When this article was first posted, the first paragraph mistakenly described the new
levees as
made of cement.
Director Spike Lee
made the documentary, «When the
Levees Broke: A Requiem in Four Acts,» which aired on HBO in 2006.
But only after the catastrophic
levee breaches — which
made schools unusable even if most students had not fled the city — did it move to take over most of the schools.
The vote signifies the progress
made in the 11 years since Hurricane Katrina and the
levee breaches, when the Legislature took the vast majority of city schools away from the School Board to be run by the state.
Like the schools and bridges and
levees they
make possible, municipal bonds are built of strong stuff.
Airplane security, baggage checking,
levee fortification, name it... people have to die in great masses before people wake up and spend the money to
make the changes that need to be changed.
Nobody wants wells to run dry, villages to starve, storm clouds to gather or
levees to break, but yet not everybody cares to clean up the mess we've
made, much less recognize that we've
made a mess, and ensure that our kids inherit a world that is a testament to your munificence.
There's a point at which you have to be accountable for the decisions you
make... if you choose to live in a floodplain, great... if you choose to live within a system of
levees you believe are suspect because of government incompetence, great... please don't expect my tax dollars to further subsidize the consequences of your decisions.
Third, the wishful thinking that «presumably the
levees would hold this time» also represents very little understanding of both how seriously flawed the
levee protection «plan» (I'm being kind) was before Katrina and also how few real improvements have been
made in the three years since then.
These are only partly natural phenomena and they have been
made worse by settlement decisions, canal development, loss of barrier wetlands, extraction of groundwater, oil, and natural gas, internal rainfall storage, and the design, construction, and failure of protective structures and inside
levees rainfall storage.
But, Katrina's high waters just
made it over the
levee, and the difference between «just over» and «not quite over» proved to be a lot of billions of dollars and human disruption.
And the
Make It Right homes — the first of which was built on the very spot where the Industrial Canal
levee breached on Aug. 29, 2005 — are designed to withstand the next hurricane.
I think the
levee issue touches on some of the points that Rodger Pielke Jr has brought up on the use of science in policy -
making.
The city of Dallas and the Trinity River Watershed Management Department are constantly working on
making improvements to the city's
levees and to flood control in particularly high - risk areas.