[quote]thunderbolt23 wrote:
Actually, it doesn’t. Levees are built to withstand water pressure, and pressure is a matter of degree. There were feasibility studies being conducted before Katrina to see if the current levee system in place could withstand a Cat 5 hurricane - ie, levees could hold their ground against 4 and lower.
The levees were built to withstand hurricane water pressure below a Cat 5 category, which - wait for it - the levees have done consistently for the delta over time.[/quote]
Thunder, your description above has nothing to do with the concept of “topping”. It has to do with the water held on “the other side” of the levee being resisted – such that the level doesn’t collapse.
Maybe the rest of your point will address this…
[quote]So why does a trained expert in an apolitical position - Max Mayfield - completely refute what you are saying? He, a professional, thought, based on the information he had, that Katrina would apply water force on the level of water force to top the levees. He did not think that the water power would be enough not cause a breach, which is a measurable observation based on a degree of force.
Yet you contend that by mere fact that the levees were made of earth - and have been successful at the job they were designed to do and constructed by the Army Corps of Engineers - that ‘topping’ meant that ‘breaching’ was inevitable? That is nonsense, refuted by not only the history and performance of the levee system, but by the professionals weighing in on the issue.
Once again, drunk on pompous abstraction, you are far afield of your capabilities to speak on the issue. The difference between ‘topping’ and ‘breaching’ is an important distinction observed by those paid well to know such things, but you somehow think you have outsmarted them. Don’t be a fool.[/quote]
I still don’t see how you are convincing yourself of this crap. It has nothing to do with credentials. It has to do with water flowing over soil. It has nothing to do with water rising up the side of the levee and exerting pressure on it.
It’s really nice of you to attack me personally in order to try to prove your point, but this has nothing to do with me – or the credentials of some politically motivated schmuck.
When water flows over soil there is this little thing called erosion. Really, go stand in a fast moving river, or perhaps go stand in front of huge waves pounding in from the ocean, you’ll see what I’m talking about.
Once again, there is a difference between a levee being able to withstand pressure, when water rises on one side of it, to it being able to avoid erosion when it is constructed of dirt and has significant amounts of water flowing over the top of it.
[quote]Sure it is. Can’t have a breach if the water power doesn’t first achieve topping. But, as stated above, ‘topping’ does not mean that a breach is inevitable, and the point of the analysis conducted by the Army Corps of Engineers and the Hurricane Center is to figure out that large area in between, based on their information.
If what you said was true, every time a levee was in danger of being ‘topped’ by the water level, there would have been a mass mobilization to prepare for a breach. Didn’t happen. Doesn’t happen. How come, Vroom? Because the pros know better than you - one does not begat the other. This thing you refer to - common sense, I think it was - seems to escape you.[/quote]
What the hell are you talking about? If you have a dirt levee, and it is topped, there will be erosion. You may be lucky and have very minimal overage, but in a cat-5 hurricane situation it’s hard to accurately predict exact water levels.
Perhaps, the previous hurricanes you refer to have been of a lower category or the levees involved were not simple dirt and grass levees? Honestly, there is no way to avoid erosion when water is running over soil. I don’t care who tells you otherwise… running water carries a lot of force.
[quote]Is it political? The whole point of this thread was to show that Bush had information that there was an expected breach. The information points to the opposite - that the experts were not thinking ‘breach’ - but you want to give us all a headache by trying to obfuscate your way out of the plain explanation. Give us all a break.
There are plenty of things that Bush and the federal government are worthy of criticism for - I don’t think this let’s anyone off the hook. But this thread and its claims have been completely refuted by the available information. Stop pretending otherwise.[/quote]
Refuted my ass.
A levee is much more likely to breach in a catastrophic way once soil erosion has weakend it’s rearward base. Alternately, if it is topped long enough, it will become short enough that it may as well have been breached.
Have you ever seen a large or fast moving body of water in action?
[quote]Here is the AP clarifying their story:
"AP FRIDAY NIGHT CLARIFICATION ON BUSH/KATRINA VIDEO Fri Mar 03 2006 19:48:29 ET
Clarification: Katrina-Video story
ASSOCIATED PRESS
WASHINGTON (AP) _ In a March 1 story, The Associated Press reported that federal disaster officials warned President Bush and his homeland security chief before Hurricane Katrina struck that the storm could breach levees in New Orleans, citing confidential video footage of an Aug. 28 briefing among U.S. officials.
The Army Corps of Engineers considers a breach a hole developing in a levee rather than an overrun. The story should have made clear that Bush was warned about floodwaters overrunning the levees, rather than the levees breaking."[/quote]
Okay, so, when floodwaters run over soil levees, what do you expect will happen to the soil?
This is not something that lets the administration off the hook at all.
I don’t know why you want to let them off the hook so badly, but perhaps ignoring the fact that anybody with a brain could figure out the dangers involved when a cat-5 hurricane drives water over the top of a soil levee is a stretch.
No?