I doubt any of us on this board have enough information to know for sure -- we can assume that there's a denser network of utility lines through the city neighborhood than the airport, but there is definitely stuff underground at the airport too -- probably a lot of it at a bigger scale but arranged in different ways. Does the stuff in the neighborhood go deep enough to affect a deep-bore tunnel? Would cut-and-cover still be more cost-effective, even if it did mean digging down through water lines, sewer lines, and gas lines (some of which might be old enough to need replacement anyway)?woofner wrote:What is different about tunneling under an airport vs tunneling under a low density residential area? Except that the airport has a surface use that is more expensive to disrupt.VAStationDude wrote:Only us naive people refuse to believe tunneling under an airport and excavting a single deep station adjacent to a parking ramp are at all comparable to tunneling through north Minneapolis.
They dug down pretty deep to work on everything below the Central Corridor -- I for one don't think it's all that crazy to think about going down a bit wider and deeper to make a transit tunnel rather than just a space for utilities.
Reminds me of how things went for me after politics swooped in to stop efforts at intercity rail in Wisconsin. Too much of the decisionmaking in these situations gets driven by whoever yells the loudest, and that tends to mean cutting back efforts at public transportation because it's seen as "wasteful" by the anti-tax crowd, even though the projects are often the more cost-effective way to get people to move around. Folks are just too afraid of the costs (they manage to turn a blind eye to highway spending, though state DOTs tend to do a masterful job of slicing big projects up into relatively bite-sized pieces, so the spending is often a lot less obvious).woofner wrote: ...
The honest answer is that I felt so dejected by his immediate dismissal when I brought up tunneling that I not only felt it pointless to respond, I went into a deep depression. I did write several responses over the course of a few months, but never felt courageous enough to send them. I went to several meetings for Bottineau, but never saw him in person. Are you satisfied now, David Greene?