BottleBob wrote:
Lew Hartswick wrote:

BottleBob wrote
The Japanese built "Kansai International Airport" on a man-made
island
5 kilometers out to sea.

http://www.takenaka.co.jp/takenaka_e...ix/kiindex.htm
I'm sure we could use similar, or even improved, construction
methods
to rebuild New Orleans above sea level.


Yes! AND it's sinking. It started even before it was finished.

Lew:

The sinking of Kansai Airport seems to have slowed down. The reasons
for the sinking should be thoroughly investigated before using similar
construction methods elsewhere.

They
even tried to make provision for the sinking in some of the surfaces.
All in all "not a good idea" to build any large structures on fill.

It may not be a good idea to build on fill, but New Orleans is in all
probability going to be rebuilt since its such an important port city.
IF it's rebuilt at it's current under sea-level height, that IMO would
just be another tragedy waiting to happen. I'm not a geologist or a
construction engineer but if bedrock under New Orleans (supposedly 80
feet down), could be reached with pile drivings any sinking problem
might be helped.

BB,
Piles don't have to reach "bedrock" to work. Friction can hold them
in place.
Just spotted something.

Both New Orleans & Lake Pontchartrain are on the Mississippi delta,
with Lake Pontchartrain being on the North side of New Orleans.
Sediment under Lake Pontchartrain is reportedly 20,000 feet
deep .... the bedrock is under that, as the oil drillers know.
I don't recall any mountain-building processes in the area that
would have created a 20,000 foot tall mountain under the site of
New Orleans.
So I'd guess that your 80 foot number just applies to how deep
pilings are driven for some purposes and has nothing to do with
your assumed bedrock depth.

This being the case, my recall of things would not have been
far off at all ..... nor my qualified statement much in error,
if at all. Unlike your lint, assumptions & hasty conclusions G.

HTH
--
Cliff