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Pastimes : Hurricane and Severe Weather Tracking
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From: redfish9/1/2005 6:35:31 AM
   of 26020
 
BATON ROUGE, La. (AP) -- It's an engineering problem that hasn't been solved: How do you plug a broken floodwall and drain a city that is submerged in water in many areas? Officials acknowledge plans to "unwater New Orleans" have failed, have been redrawn and are continuing to evolve.

The first was to use helicopters to drop hefty sandbags and giant concrete barriers to plug the hole in the floodwall of a canal which usually drains water from New Orleans and Jefferson Parish.

Crews had already moved in the 250 concrete walls and hundreds of sandbags when the problems cropped up. Transportation and engineering officials questioned whether the original structure was sound enough to hold against the pressure from the water.

So, they tweaked the plans and were working to hire a contractor to drive steel, sheet metal pilings down across the canal to stop water in the lake from moving into the canal before it ever got to the floodwall.

That still was difficult. The pilings need to go down beyond 30 feet to fully block the flow of water, according to Michael B. Rogers, with the U.S. Army Corps of Engineers.

In the meantime, the corps was planning to punch deliberate breaches into the levee system along Lake Pontchartrain, moving from east to west, cutting notches that would let the water flow back out of New Orleans and into the lake, Rogers said. "People are in the air right now locating the best places to do that," Rogers said Wednesday.

wwltv.com
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