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[quote]QUOTE: Originally posted by vsmith It didnt start off underwater, marsh land is very prone to subsiedance, over the years the land sinks, normally it just floods and becomes wetlands. Now you build a settlement there, the land sinks, floods, so they build a levee to keep the water out. as the years go by the land sinks a couple more inches, so they keep raising the levees. Now in addition to the settling, add silting on the riverbed, the top of the river is now flows even higher so you raise the levees again, see? Add 250 years of this and you end up with a city 20' in some places below sea level. They never imported any soil to raise the city, instead placing all thier faith in a levee system that dates back to horse and buggy days. [/quote] I also heard that the city water supply is underneath New Orleans and from years and years of pumping it also contributed to the lowering of land.
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