I'm looking for an order of magnitude cost estimate for a 12 foot diameter drainage tunnel. It would be about 5,000 feet long and probably only 20 - 30 feet below the ground surface. The ground is assumed to be a mixture of sand, gravel, cobbles and silt with no bedrock. Groundwater is not likely to be encountered.
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12' tunnel cost
- Thread starter cvg
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Costs are highly variable from region to region. Best to get a budget cost from a local tunnel contractor. He will certainly need more information than what is given above. Info such as, is lost ground a concern ie. what is overlying the tunnel, are the breakin and breakout through embankments or from vertical shafts, etc.
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