How does a levee break?



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Topic: Science > Physics
User: ""
Date: 03 Sep 2005 07:14:39 PM
Object: How does a levee break?
What causes a levee to break? Why doesn't it just overflow and spill
over ... like my bathtub?
.

User: "Sam Wormley"

Title: Re: How does a levee break? 03 Sep 2005 08:48:48 PM
wrote:

What causes a levee to break? Why doesn't it just overflow and spill
over ... like my bathtub?

Implicit in the [Newton's] second law is a reference, and motion is
always with respect to something.
Newton's Second Law
http://scienceworld.wolfram.com/physics/NewtonsSecondLaw.html
Newton had is right, F = dp/dt is right on!
"The motion of a particle is described by Euler's statement of Newton's
second law, namely
F = ma
Here F is the applied force, m is the mass of the particle, and
a = dv/dt is the particle's acceleration, with v being the particle's
velocity. This equation, together with the principle that bodies act
symmetrically on one another--so that the force particle A feels from
particle B is equal to the force B feels from A--is the basis for
understanding particle dynamics".
"Newton's law completely describes all the phenomena of classical
mechanics".... including the beating of wind and water (waves) on
a levee.
.

User: ""

Title: Re: How does a levee break? 03 Sep 2005 07:35:41 PM
wrote:

What causes a levee to break? Why doesn't it just overflow and spill
over ... like my bathtub?

Built by the lowest bidder on a government pork barrel contract funded
just enough to build SOMETHING but not enough to build something that
will withstand worst case conditions.
--
Jim Pennino
Remove .spam.sux to reply.
.

User: "Sbharris[atsign]ix.netcom.com"

Title: Re: How does a levee break? 03 Sep 2005 09:33:21 PM
wrote:

What causes a levee to break? Why doesn't it just overflow and spill
over ... like my bathtub?

I don't know, but when they start to have Relief Rock Concerts for New
Orleans, it would be a *crime* if they missed covering Don McLean's
_American Pie_.
SBH
.
User: "sam ende"

Title: Re: How does a levee break? 05 Sep 2005 01:49:44 PM
Sbharris[atsign]ix.netcom.com wrote:

I don't know, but when they start to have Relief Rock Concerts for New
Orleans, it would be a *crime* if they missed covering Don McLean's
_American Pie_.

i googled for the lyrics and found this, quite interesting;
http://www.rareexception.com/Garden/American.php
sammi
.

User: "Edward Green"

Title: Re: How does a levee break? 03 Sep 2005 09:50:20 PM
Sbharris[atsign]ix.netcom.com wrote:

ckouza@eudoramail.com wrote:

What causes a levee to break? Why doesn't it just overflow and spill
over ... like my bathtub?




I don't know, but when they start to have Relief Rock Concerts for New
Orleans, it would be a *crime* if they missed covering Don McLean's
_American Pie_.

I have a modest politically incorrect proposal for rebuilding New
Orleans. The parts of town that are submerged to the rooftops should
simple be landfilled to the level of the lake plus, and rebuilt. That
way this won't happen next time. Also have the benefit of
substantially increasing property values in that parish (once you
figure out what parts of the landfill are projections of the former
parcels), so that the poor people who lived there can sell out to
affluent people at, ahem, windfall profits.
Plus, we create a dandy archeological find for future generations: the
lost submerged city of New Orleans! Land can then be reexcavated in
another massive public works project to uncover lost history.
I think if you looked through history and prehistory you would find
quite a number of precedents for partial or entire settlements becoming
submerged and (unavoidably) abandoned. They are continually being
found just off the coastlines, or under some lake. There was the
ancient city along the north coast of Africa which, if I remember
correctly, more or less slipped into the Mediterranean as a whole after
an earthquake.
.
User: "Sam Wormley"

Title: Re: How does a levee break? 03 Sep 2005 09:58:56 PM
Edward Green wrote:

Sbharris[atsign]ix.netcom.com wrote:


ckouza@eudoramail.com wrote:

What causes a levee to break? Why doesn't it just overflow and spill
over ... like my bathtub?




I don't know, but when they start to have Relief Rock Concerts for New
Orleans, it would be a *crime* if they missed covering Don McLean's
_American Pie_.



I have a modest politically incorrect proposal for rebuilding New
Orleans. The parts of town that are submerged to the rooftops should
simple be landfilled to the level of the lake plus, and rebuilt. That
way this won't happen next time.

Make sure to take in the extra 20 feet of sea level rise expected
due to global warming over the next 20-2000 years... yes the uncertainty
does include that broad range.
Also have the benefit of

substantially increasing property values in that parish (once you
figure out what parts of the landfill are projections of the former
parcels), so that the poor people who lived there can sell out to
affluent people at, ahem, windfall profits.

Plus, we create a dandy archeological find for future generations: the
lost submerged city of New Orleans! Land can then be reexcavated in
another massive public works project to uncover lost history.

I think if you looked through history and prehistory you would find
quite a number of precedents for partial or entire settlements becoming
submerged and (unavoidably) abandoned. They are continually being
found just off the coastlines, or under some lake. There was the
ancient city along the north coast of Africa which, if I remember
correctly, more or less slipped into the Mediterranean as a whole after
an earthquake.

.



User: "The Ghost In The Machine"

Title: Re: How does a levee break? 03 Sep 2005 09:00:06 PM
In sci.physics,

<
>
wrote
on 3 Sep 2005 17:14:39 -0700
<1125792879.782446.237030@z14g2000cwz.googlegroups.com>:

What causes a levee to break? Why doesn't it just overflow and spill
over ... like my bathtub?

A number of failure modes are possible. The most likely one is
probably a variant of the water getting underneath the
levee, weakening the levee to the point of it collapsing.
Another variant is if the one side is overfull, the splashover
might weaken the far side of the levee, carrying the earth
away until the levee fails. Or perhaps the water going over
the levee cuts a channel therein.
At least, such is my understanding for earthen levees. Concrete
ones are a little stiffer but even concrete can't be infinitely
strong to withstand the pressures of a massive storm.
--
#191,

It's still legal to go .sigless.
.

User: ""

Title: Re: How does a levee break? 04 Sep 2005 05:17:26 AM
according to one news story, the break happens when the overflow erodes
the outside wall, leading to wall collapse from the outside in. But
the wall held till the overflow occured. The outside wall is
apparently not designed to resist the erosion effects of the overflow.
.


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