Don't use steel. We had a 24 inch steel culvert on the driveway, put it in in 2002 for $800.
Last year, it rusted in two. We replaced it with plastic and the replacement cost was $1700.
Exactly right,, silt and or water sits in the corregations and rusts out the bottoms,, unless it is a bitumious coated corregated pipe,, theres a fiberglass pipe out that is mostly fire proof and the best pipe out there excluding concrete pipe,, advice if u want it,,, get the biggest dia pipe u can fit under your road,,, if it calls for for 15" get 24" sticks and trash wont clogg it up as easily,, and a min of 1.0% fall,, smooth interior pipe rushes the water on thru,,
