That quote is from when they were in the prototyping stage - refining requirements and specs.
They they understand the performance characteristics better, after prototype testing.
The bottom Line coming out of prototype testing, is that hey reserve the flexibility to tailor specs on each segment they contract/build. They know the bounds that will meet the kind of functional requirements laid out in the prototype solicitation, and should not approve any design that can’t meet at least those requirements.
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makes sense, beaubo.
pretty much all varies a little?
I guess a lot would depend on substrata where the install it?
how deep would you have to go around tiajuana where they tunnel everywhere?
or, what happens when you hit the water table?
or, in texas, you might hit oil!! lol
“how deep would you have to go around Tijuana where they tunnel everywhere?”
There is a good bit of bedrock around there, so the corridors for tunneling are a minority of the 14 mile span - and they are well known to Border Patrol.
Generally, the soil is deepest there in the lowest elevations.
“what happens when you hit the water table?”
Makes it a lot harder to operate a tunnel - they might need to line the sides and give extra support to the roof, and may have to run pumps. It makes it harder, but not necessarily a showstopper.