Why is 15 Inch HDPE Pipe Price Better?

Meant for title to be Dual Wall HDPE Minimum depth vs Metal

I found an old thread here discussing pros and cons of metal vs plastic culvert pipes. I'm running into an issue where I need a 15" culvert pipe, 20' long. I already got a dual wall HDPE plastic one for the use, but according to the documents it says it needs 18" of fill to withstand the H-25 rating, which, in my terms is basically a concrete truck. If I did my math right....

I simply can't afford to build up the driveway that much to have 18" of fill dirt above the pipe. It says a minimum of 12" fill if I'm going to pave the point above this culvert, but I definitely won't be doing that any time soon especially during house construction with all the grading to be done.

I was hoping I could hear some comments from y'all and see if any of you have less than 18" or even less than 12" of fill above these dual wall corrugated culvert pipes, and what the most weight was driven over them; i.e. how much axle weight. I will have at least 5, if now 10 concrete trucks driving over this culvert during construction phase. I want to get the dirt base in, then order some mudrock or crushed concrete as a driveway base and live my life, but I don't want to order the rock if I need to be temporary mounding 18" of dirt above this culvert for the heavy trucks.

I thought as a compromise I would use a steel culvert instead, but that means spending another $500 and not using this plastic one, and apparently the steel ones require 12" of fill above them, so that would only gain me 6". I know I have seen old steel ones exposed and driven on, but that is a moot point as I have a plastic one now and want to try using it with the minimum amount of fill above it to prevent having such a tall driveway. The driveway will already be at least a foot higher than any yard.

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Corrugated HDPE Culvert Pipe is ideal for driveway and roadway applications. Made from high density polyethylene, this pipe is built for efficient flow and excellent corrosion resistance. Take advantage of the pipe's bell and spigot with gasket to achieve a water-tight joint.

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• Culvert is manufactured with a smooth interior, allowing for more efficient flow
• Designed with a bell and spigot with a gasket for a water-tight joint
• Excellent abrasion and corrosion resistance
• Culvert pipe offers a long-term drainage solution
• Culvert pipe is made from high density polyethylene (HDPE)
• Our culverts are DOT approved and will support the weight of any DOT approved vehicle when installed correctly; if unsure of how to properly install, please seek professional advice
• Pipe meets or exceeds AASHTO M252 and AASHTO M294 Type S

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