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Go With Your Gut

Continued from page 1

Published on July 05, 2007 at 11:24am

Imagine a footed bathtub full to the very brim and your fat uncle Waldo standing with a towel around his big middle, looking longingly. It's like saying, "You can get in the tub, Uncle Waldo, as long as not one drop spills out."

You know what that really means? Waldo! Use the shower!

Dallas City Council member Angela Hunt, who has become the de facto captain and commander of the anti-highway forces, pushed and pulled and tugged on the Corps recently and finally got them to admit something that really hasn't sunk in publicly yet: If the Trinity River tollway gets built, it will be the first major highway the Corps has ever allowed to be built inside a Corps of Engineers levee system.

First time. Ever. There we will be—messing with the river in a big way. Gambling it will work, like that time they tried to make the Mississippi turn.

On top of that, you have the city now telling people that the toll road won't flood, because they're going to put a wall next to it. Think about Katrina. Walls don't work. Huge, brown, angry rivers knock walls out of their way like wet paper.

That's why levees are big and fat and sloped—so they can't easily be flattened. The only way to protect that highway from flooding will be with a second levee system inside the flood control levees.

Think of the area between the flood control levees as a pipe big enough to carry all that flood water through downtown without letting any of it spill. Now inside that pipe we're going to stick an entire freeway and another levee system, leaving a space only two-thirds to maybe half the size of what we now have to carry the water.

Back to that idea of making the road "hydraulically neutral." How to get this much Waldo into the tub without spilling? Make the tub deeper. Way deeper. In this case, we would have to dig the river channel out deeper and wider by an amount that would totally offset the mass of the entire freeway and the levees built to protect it.

What's wrong with that? A little issue called "scouring"—just what the Mississippi did when it dug that tunnel and blew up like Vesuvius on the other side of the levee.

For example: I've been talking off and on this week with Corps officials about water releases from flooded lakes upriver from Dallas. At a certain point, the Corps has to release water from those lakes, or the water will overtop the dams and possibly blow them out.

That would be Katrina in Dallas.

But they have to let the water out in trickles because of scouring. If they pull open a floodgate and allow a major release all of a sudden, that water will come roaring downstream and rip down bridges, dig through levees and cause who knows what mayhem.

If you dig the Trinity River channel down into a deep channel, you create huge new velocities and brutal, unpredictable forces contributing to scouring. I know somebody is going to tell me that engineers can do anything. And I am going to point to New Orleans and say, "Yeah, but engineers with politicians on their backs can create havoc beyond imagining."

So back to Dallas. Last week I watched while Angela Hunt and her small army of volunteers delivered boxes of petitions to the city secretary, calling for a referendum on the toll road. Most of these are people I have known for years. They are motivated by all of the issues I have raised here.

I can't prevent the road hucksters from denigrating them as tree-huggers and trouble-makers. But I do know better. These are people who have taken the time to learn about these issues and who are genuinely horrified by the mistake the city seems determined to make with this highway.

On the other hand, we have our newly elected mayor, Tom Leppert, a construction executive who was unknown in the city until he was recruited and funded by the Dallas Citizens Council, a private group that meets in secret. Leppert's stance on the referendum so far has been the worst imaginable, a line that is both utterly irresponsible and crassly exploitative:

Just do it. People want to see some pretty stuff built down there. Just get going. No more delays.

People are stupid.

He ignores the fact that the toll road is slowing down the overall project. Getting rid of it will speed up the rest of the project, not slow it down. He ignores all of the flood control issues. He dismisses Hunt and her effort as a distraction.

Don't worry. Be happy. Just do it.

Leppert is exactly what happened to New Orleans. The difference between Dallas and New Orleans?

This referendum.

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