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12-27-2022, 12:56 PM
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#1
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Junior Member
Join Date: Apr 2011
Location: Washington
Posts: 6
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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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Sharon
Toledo, WA
2015 Allegro Red 33aa
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12-27-2022, 01:10 PM
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#2
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Senior Member
Join Date: Apr 2021
Location: DFW
Posts: 1,648
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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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2020 Chevy Silverado 1500
Forest River Wildwood XLite 263BHXL
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12-27-2022, 01:51 PM
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#3
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Senior Member
Join Date: Jul 2005
Posts: 5,996
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Cover it with 1 pipe diameter of compacted material and call it a day.
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TandW
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12-27-2022, 03:00 PM
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#4
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,497
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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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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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12-27-2022, 03:10 PM
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#5
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Senior Member
Join Date: Oct 2020
Location: Girard, Ohio
Posts: 149
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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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2004 MONACO LAPALMA, W22, 8.1, ALLISON 1000, SAFETY PLUS, 4 AIR BAGS, KONI RED SHOCKS, 2011 MKX, BLUE OXE TOW BAR, BRAKE BUDDY CLASSIC.
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12-27-2022, 03:15 PM
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#6
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Jun 2016
Location: On the continental divide
Posts: 2,621
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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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2004 Fleetwood Pace Arrow 37c, 8.1 gasser, (Jezebel) Ultra RV ECM / TCM, plugs wires, and rear track bar, PPE deep Tx pan w/ temp gage, Bilstein's, Sailun's & Sumo's all round, pushed by a 2002 Grand Caravan, on a Master Tow Dolly OR a WR-250 on a rail.
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12-27-2022, 03:23 PM
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#7
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,497
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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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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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12-27-2022, 03:26 PM
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#8
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Senior Member
Join Date: Nov 2015
Posts: 26,689
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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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Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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12-27-2022, 03:56 PM
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#9
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Senior Member
Join Date: Apr 2021
Location: DFW
Posts: 1,648
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Quote:
Originally Posted by Old-Biscuit
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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I would think that any screen that was skunk proof would collect a lot of debris?
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2020 Chevy Silverado 1500
Forest River Wildwood XLite 263BHXL
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12-27-2022, 04:02 PM
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#10
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Senior Member
Join Date: Mar 2015
Location: Greensboro, NC
Posts: 2,738
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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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1998 Min Winnie, 2000 Winbago Journey, 2015 ACE 29.3
2016 Thor Miramar 34.2
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12-27-2022, 04:57 PM
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#11
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Senior Member
Country Coach Owners Club
Join Date: Feb 2019
Location: Tucson AZ
Posts: 456
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Quote:
Originally Posted by triplewide
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.
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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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John
2007 Country Coach Tribute; Cat C9 400; 2012 Ford Edge toad; Roadmaster Blackhawk 2 10,000 lb tow bar; Demco AF1 Braking System; 2007 BMW K1200LT Hannigan Trike Conversion; Member, IEEE, NFPA, PMI, NRC SRO (Ret).
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12-27-2022, 05:09 PM
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#12
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Senior Member
Join Date: Nov 2015
Posts: 26,689
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Quote:
Originally Posted by carybosse
I would think that any screen that was skunk proof would collect a lot of debris?
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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
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I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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12-28-2022, 08:05 AM
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#13
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Senior Member
Join Date: Apr 2021
Location: DFW
Posts: 1,648
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Quote:
Originally Posted by Old-Biscuit
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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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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2020 Chevy Silverado 1500
Forest River Wildwood XLite 263BHXL
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12-28-2022, 08:40 AM
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#14
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Senior Member
Appalachian Campers
Join Date: Sep 2002
Location: Dixie !! (north Georgia) USA
Posts: 4,113
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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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