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Old 12-27-2022, 12:56 PM   #1
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Size of corrugated pipe needed for driveway for 45' motorhomes

I am planning on adding an entrance off my county road to my property and need to know what size corrugated pipe do you need for a ditch to handle weight of 45' motorhomes and 5th wheels. Would greatly appreciate any suggestions on this along with how to properly install for such heavy vehicles. I know their gross weight is around 51,000 lbs. I also already have a permit for it.
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Old 12-27-2022, 01:10 PM   #2
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I think you need to start with the diameter to handle the amount of water flow anticipated. I would think the permit process would have required that up front. The more dirt you can put over the pipe the better, and a concrete driveway with rebar should help spread out the load. (Of course, the dirt and concrete all add to the weight on top the pipe.)
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Old 12-27-2022, 01:51 PM   #3
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Cover it with 1 pipe diameter of compacted material and call it a day.
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Old 12-27-2022, 03:00 PM   #4
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I had to get a permit and the county road inspector specified a 1' diameter pipe, did not specify type or depth. I bought a 1' metal corrugated pipe 20' long, it was heavy gauge.

There was a shallow ditch along the road already and the way the slope was I could not put the culvert that deep. So I dug a trench with my backhoe that would allow drainage but it did not really provide enough depth to put a layer of compacted dirt on top. I ended up pouring (bag mix type) over the culvert so it flowed down the sides and put about +4" thick on top with rebar.



It seems to have worked. I've had dozens of heavy gravel, delivery, and concrete trucks come across the culvert over the last 5 years while I was building my house and garage. . Not sure if it would have held up if I hadn't poured the concrete over the top.
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Old 12-27-2022, 03:10 PM   #5
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not an expert

Whomever sells you the culvert should have the load capabilities.
Probable per linear ft.
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Old 12-27-2022, 03:15 PM   #6
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A one foot diameter pipe is not very big. How are you going to keep it clean ?
I'd go with at least 2' and bury it 2' below grade.
But that's just me.

Mike in Colorado
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Old 12-27-2022, 03:23 PM   #7
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Haven't had a problem with it getting blocked yet. During heavy rains there is a substantial amount of water flowing down the ditch and it washes everything out. Being a smaller diameter the water has quite a bit of velocity, enough to wash everything through it.

If needed I'll make some sort of tool to pull any stuck debris out but so far so good.
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Old 12-27-2022, 03:26 PM   #8
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I have 2 driveways...one at each end of property
Both have 12" Diameter steel pipe with 4" concrete driveway over one and 6" compacted dirt/pee gravel over the other

Both have been there since 1997........driven over with various size/weight vehicles.

4 yrs ago I added screens to inlet/outlet to keep Skunks out
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Old 12-27-2022, 03:56 PM   #9
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Originally Posted by Old-Biscuit View Post
I have 2 driveways...one at each end of property
Both have 12" Diameter steel pipe with 4" concrete driveway over one and 6" compacted dirt/pee gravel over the other

Both have been there since 1997........driven over with various size/weight vehicles.

4 yrs ago I added screens to inlet/outlet to keep Skunks out
I would think that any screen that was skunk proof would collect a lot of debris?
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Old 12-27-2022, 04:02 PM   #10
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Some government agency maintains the road usually. In North Carolina my road in the county is governed by NCDOT. You probably have a similar agency for yours if state maintained. They regulate the diameter and material type of culverts.
In NC 12" fit the bill on the 50 or so I contracted to have installed. As posted above, the existing grade and ditch determine how deep you can place the pipe and how much fill you can place on top. Compaction around the pipe helps support the pipe. Placing the pipe and back filling with concrete is about the best you could do. Of all the pipes I was involved with none collapsed even with full concrete trucks and 120 ton cranes crossing them. Some of them with as little as 6" cover over the top.



12", as deep as you can with good compaction around the pipe.


If you plan on a lot of traffic you may want to place a concrete reinforced apron from the road surface over the pipe and back onto your property about 6'. This will help prevent the road surface from eroding at the edge.
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Old 12-27-2022, 04:57 PM   #11
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Compaction around the pipe helps support the pipe...

Some of them with as little as 6" cover over the top...

... as deep as you can with good compaction around the pipe.

.
X2 on all the above. Compacting *around* the pipe along its entire length is as important, if not more so, than what is over the pipe. The cylinder can support a lot of weight if it is not allowed to flatten/bulge out on the sides.
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Old 12-27-2022, 05:09 PM   #12
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I would think that any screen that was skunk proof would collect a lot of debris?
That's why you clean them as necessary
Which is not often enough to be an issue

Sure lot less than having SKUNKS living in them
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Old 12-28-2022, 08:05 AM   #13
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That's why you clean them as necessary
Which is not often enough to be an issue

Sure lot less than having SKUNKS living in them
I would gladly spend some time cleaning the screen to avoid the skunks. I presume only one side has a real issue.

I just remember the storm sewer the city installed in my back yard (at my request) and how it backed up during a hurricane. Had to go out in middle of storm and clear the debris, was not fun. Thankfully, where I was at, we only saw tropical storm force winds.
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Old 12-28-2022, 08:40 AM   #14
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Not running your business but think about the grade the ditch you are crossing falls at. Might be a bit narrow at 12" but it would likely work unless there is a cloudburst. My drive pipe is 12" (concrete) and on my private property. We have some heavy rains here but the rain is falling on a field that is on my property and does not drain a highway. County would have the say on their roads'
I've had loaded concrete trucks, sewage pump truck and bucket trucks across it. No damage.
Flow would be my only concern if I was in your situation
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