Cause Of Hump In Asphalt Drive Over Culvert Pipe - General DIY Discussions - DIY Chatroom Home Improvement Forum

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Old 07-08-2014, 11:22 AM   #1
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Cause of hump in asphalt drive over culvert pipe

I put an asphalt drive in about three years ago. The culvert is not graded correctly and I do have standing water on both sides of the pipe that was installed when the driveway was put in. The contractor said he would grade the ground correctly for the pipe but I'd need to continue working with the city on getting the ditch graded. So, my drive is graded but the ditch isn't. This year I noticed the hump in the drive that is over the pipe and wanted to know if that is happening because of the standing water? I haven't sealcoated the drive at all since it was put in so I'd like your thoughts if that would be a contributing factor in the hump also? Or could it be something else that is making this happen?
There is about 60 feet of yard before the drive and 25 after the drive with the high side starting the incline. I hope this isn't to confusing


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Old 07-08-2014, 09:37 PM   #2
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If there is standing water on both sides of the culvert, then I would say it is graded properly. You have to realize that the ditch needs to drain in either or both directions.

As for the hump above the culvert, I would say that what you have is settling on either side of the culvert. So your culvert is not shooting up out of the ground, rather the ground is settling, but not the culvert.

You don't want your culvert to settle, because this would become a "hole".


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Old 07-09-2014, 09:57 AM   #3
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You don't say where you live but this seems to the results of a freeze/thaw cycle. Ice formed under the pipe due to the standing water freezing and pushing the pipe up. After the ice around the pipe thawed, soils infiltrated the space under the pipe and did not let the pipe settle all the way. This will continue to happen until the water is drained from the pipe. I would contact the streets department and insist that they inspect the ditch and your pipe.
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