08/31/2026
Site prep is key when building a high tunnel! Do it right the first time, and save yourself lots of potential headaches down the road.
• The footprint of your tunnel location should be as close to level as possible. 3% grade is maximum for a high tunnel like this, but less is better.
• Have a plan for controlling water and getting it to flow away from the tunnel. Create drainage swales around and away from the tunnel. Don’t build in a low spot where water can’t drain away.
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