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Old 01-10-2020, 05:10 PM   #1
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Sewer Drain Recommendations for Concrete Pad

This spring I plan to pour a concrete pad to park our 40' 5th wheel on a rather permanent basis. The drain in the pad will go to a 1000 gallon holding tank. Any recommendations where I should place the drain in the concrete pad? Should I place the drain directly under the camper outlet and have a short straight down pipe or is it better to have it drain ahead or behind a few feet? Any photos of anyone else's hard piped drain system would be appreciated. Also, what is the best way to seal the drain pipe in the drain hole? Thanks!
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Old 01-10-2020, 05:37 PM   #2
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If possible, I would recommend not placing the tank under the pad. Doing so may prevent you from doing any repairs on the tank in the future. If it will be a closed system, you may need a vent of some type.
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Old 01-10-2020, 08:17 PM   #3
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If it's permanent, the shorter the better as far as where to place the sewer port in the concrete.

As mentioned, hopefully you don't plan to put the tank itself under the concrete.

Also, are you going to have it pumped periodically? (the tank)
You'll need to plan a port or removable hatch for that too.
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Old 01-10-2020, 08:47 PM   #4
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Yes, the tank will be off to the side with provisions for pumping.
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Old 01-10-2020, 09:03 PM   #5
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So let me get this right.. You plan to bury a 1000 gallon tank to dump your sewer tanks in to? Iím assuming that tank will need to be vented? How close to your RV will this vent be? Is it a tank or a septic system?

I just question dumping 1000 gallons of sewer into an enclosed tank? But what do I know..lol.
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Old 01-10-2020, 09:16 PM   #6
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It will be a septic tank installed per code. I have one at another location by my shop and odors are non existent.
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Old 01-10-2020, 09:36 PM   #7
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It will be a septic tank installed per code. I have one at another location by my shop and odors are non existent.
Now that makes sense. When you said bury a tank I just visioned a large tank. Septic tanks are common everywhere and do not have vents.

Now to your original,question. I would put the drain just a few feet to the outside of your sewer drain. I have 2 sewer hoses for my 5th wheel. One is a long (15í) and the second is a stiff accordion style hose that probably extends a little over 5 feet. I love it when I can position my sewer drain right next to the campground receptacle. Something like this.... https://smile.amazon.com/Camco-39664...s%2C407&sr=8-4

I canít see any reason to put it further back or forward. Youíre building the pad, put the sewer input about 5 feet straight out from the dump valve...good luck.
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Old 01-10-2020, 10:16 PM   #8
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I would also put a lid or cap on the drain so that rain water does not go into the septic system. The only thing that should go in the septic would be your black water followed by your grey water. Nothing should go into the black tank except items that first went into you mouth and out the other end, plus toilet paper.
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Old 01-11-2020, 02:37 PM   #9
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If possible, I would recommend not placing the tank under the pad. Doing so may prevent you from doing any repairs on the tank in the future. If it will be a closed system, you may need a vent of some type.
I would go along with is reply and add that I would look at where your sewer drain is and keep it within a easy lenght of that. A freind mentioned to me that they had a electrical plug 30 amp installed that way they could run almost everything , one AC unit at a time while loading up or cleaning after a trip.i thought that to be smart.
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Old 01-11-2020, 04:04 PM   #10
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Raise the drain

If the end of the pipe to the tank is an inch or two above the pad you won't have to worry about rain water running into the pipe - unless you have serious flooding problems.
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Old 01-11-2020, 04:10 PM   #11
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Septic tanks are vented through the house plumbing. In some instances, like terrain and wind one can get odors from vents on a house. When that happens you add charcoal filters.
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Old 01-11-2020, 05:29 PM   #12
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If it were me I would use hard DWV and not have to worry about the flex getting holes in it . I have plumbed a few that way . And I would wire for 50 amps if the trailer has 50 amps.
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Old 01-11-2020, 06:59 PM   #13
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I built level pads and not a full concrete slab next to the sewer cleanout. The top of the cleanout is recessed inside of a heavy duty sprinkler valve box. The cover of the box is flush with the ground so I can just run the lawn tractor right over it. I installed a bayonet fitting on the sewer pipe like the one on the RV dump so when I dump, both ends are locked. You could probably pour concrete around the valve box and have the cover flush with the surface for snow removal if that is an issue.
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Old 01-12-2020, 12:10 AM   #14
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Tank

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Yes, the tank will be off to the side with provisions for pumping.
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Old 01-13-2020, 11:50 PM   #15
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As was mentioned in an earlier post, a septic tank is vented thru the plumbing system of a building, if you are installing a holding tank with no vent you will most likely build pressure in the system from the bacteria breaking down the sewer. Depending on the amount you fill it to and the type of cap on the dump you can have anything from bad smell leaking out at point of connection (like a hinged cap, no seal) to the connector blowing off ( screwed plug, like a firecracker under a can). Also, the gasses made in a septic tank is methane, kinda flammable. I would add a vent just to be on the safe side.
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