Galvanized Steel Culvert 3

https://page-wiki.win/index.php/Understanding_Multi_Plate_Pipe_in_Drainage_and_Road_Construction

A galvanized steel culvert is a long, sturdy tube made from heavy-gauge steel that's been coated with zinc to resist rust. It's buried under roads or driveways to channel water from one side to the other, often in ditches or along drainage pathways. The galvanized layer gives it a distinctive silvery sheen and helps it last for decades. You might spot one where a stream passes under a country lane, or in a field where runoff needs to flow without washing away the soil.