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Question DetailsAsked on 2/5/2018

I need a old metal colvert pipe removed and replaced with new plastic pipe in a driveway 60foot

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Be sure to coordinate with your local road or drainage district or department on the size required - commonly they specify minimum (regardless of anticpated flow in the ditch) 12" on streets with storm drains, 18" on streets using lateral drainage along the ditches and 24" for those in snow/icing country, and on up in size depending on how much flow the ditch is expected to carry - but of course those numbers vary by locale. Many areas require a specific permit and inspection by the street/highway department for culverts in the right-of-way. For a 60' culvert personally I would try VERY hard to not use anything under 16-18 inch to facilitate cleaning it out with a jet nozzle as needed.


If a paved driveway, a Driveway - Concrete or Driveway - Asphalt contractor (your Search the List categories to find well-rated and reviewed vendors) would be the normal contractors for this work. If not a paved road, one of those or an Excavation contractor.


To prevent ovaling and crushing, it is critical that culvert be properly bedded in crushed stone alll around - proper COMPACTED bedding all around and over the top for a total width (centered on the culvert) of at least twice the culvert diameter as well. That good compaction of structural grade fill (usually using driveway paving base material) provides the distribution of the vehicle load away fro the center of the culvert, and the lateral restraint to hold the culvert in its round shape,, which is needed to avoid crushing or buckling.


My recommendation regardless of what the manufacturer brochure says if using plastic pipe - have minimum dirt cover over the top of 10 inches or half the pipe diameter (whichever is greater), and use end flares even if not required because the ends crush down and deform REAL easy. Proper flares backed buy compacted fill also reduce bypass flow through the fill, and improve the through-flow capacity. A properly flare entrance not only partly protects against erosion of the roadway fill into the culvert, but also can increase the through-flow capacity as much as 3-fold over a culvert end freely sticking out into the flow.


In a driveway with shallow ditch this cover requirement (or even just manufacturer recommendations) may mandate multiple culverts side by side to maintain adequate cover. As you probably can tell I am not a fan of most plastic culverts - there are some real shoddy ones out there, especially at box stores - as well as unduly thin aluminum and steel ones - I have come across some which will not even hold a person standing on them. I prefer hot-dipped galvanized steel with sprayed asphaltic coating inside and out. The only plastic one I have come across that I would/have specified for under-road use are Contech Products Eagle Corr PE double wall culverts, made with HDPE plastic. I definitely would not recommend using any single-wall plastic culvert, and for normal driveway use a galavanized culvert (assuming not in salt water conditions) should last 50+ years if properly asphalt coated at the factory and any scratchoffs touched up on the jobsite during installation.

Answered 9 months ago by LCD




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