I pave driveways for a living. Asphalt and concrete are tough materials, designed to support the weight of cars and trucks. However, they have an Achilles' heel: water. Specifically, water that falls from a height or flows in a concentrated stream. When I get a call to repair a driveway that has "alligator cracking" or a sunken depression, I usually don't look at the pavement first; I look up...
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