What do you guys think about using a large plasitc garbage can as a pipe adapter ?
 

I had to put a culvert under my driveway. I used 24 inch pipe, and I am necking down to 12 " at a later junction down the line . I have 300 some yards and two legs of pipe to run still
I just called to get a big Fernco, or pipe adapter and wholly cow... $389.00 for a plastic adapter, but the bad part is, I can't get it till next week. I was going to dig this weekend
There would never be any weight , or traffic , passing over it, with the exception of my lawn tractors, and I have lots of gravel to protect it . It is also at least 18 Inches under ground.
I have a real nice super sturdy plastic recycling can here at the shop that is tough as nails, and has a perfect sized opening at just over 24 ". I was going to wrap a huge hose clamp around the big side, and cut a hole in the bottom of the can to accept the smaller pipe.
Think it'll work? Any other good ideas?

Your idea seems like it will work. I am guessing you will place the 12" piece in the bottom half of the larger culvert? The pressure of earth/gravel will be high. I would mix up some concrete and pour it over the smaller pipe at the join to re-inforce the joint and prevent water from going through the joint.

Best
Les

Sounds like a good ol red neck fixing. I'd do it...

Don't forget to use duck (duct) tape and lots of Sheetrock screws.

Does anyone sell a 12 inch flange that you can attach to the garbage can to give it that extra touch of craftsmanship?

Water pressure......
 

When you reduce the pipe diameter by half, any period of high water flow will cause a hydraulic high pressure point at the reduction point. If you expect the pipe to flow full at any time, you will need to do something to keep the water from washing out the joint. You could encase the entire joint in concrete for example. Also, make certain that the adapter fits over the 24" pipe and inside the 12" pipe to help keep the water inside the pipe as it goes downhill. Water under pressure has a way of finding weak spots! Good luck!

I'm concerned about the narrower pipe on the downhill side as well. Sounds like a recipe for having to do it again in a few years.

+1 to what Fred and Gogar said. All you need is one gully washer to blow out that hose clamp connection.

I was just going to suggest "cast in place" concrete pipe.

I wouldn't reduce the size of the culvert........it will surely plug if it gets much silt or gravel in it.
can you dig out the 24" and replace it with a 12" or an 18"?
How much run off is going through this culvert?
Can you daylight the other end of the culvert and run a stone lined ditch to get rid of the water?
Got a picture of where this is going?

Why not run 24" pipe for the full run? No connection needed. No problem with internal increase of pressure.

You're talking a real shiztload of rain to fill even a 6" pipe though.

Fred, are you sure you're not a Kiwi?

It sounds a good idea to me. I'd place rocks around it so if at any time there does happen to be some unintended weight on it the structure of rocks takes the weight.

Why don't you just wait. You might regret it down the road.

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Could be............
 

When I was in the Navy, I just missed out on a chance to take R&R in Australia/New Zeland and have regretted it for the last 45 years! Who knows, since the Mrs and I are both retired now, we just might take a long vacation "down under" some day.

The stream that this pipe contains, is all but a trickle until severe storms. It is currently in a 4 inch pipe, and that is almost sufficient enough, but clogs up way to easily. For the last 13 years of my life, after every rain, I am standing out in my yard snaking out that damn pipe. When it clogs, it backs up and then flows over my driveway, which finallly , after all these years of flooding, washed my driveway out this past spring .
I am going to put a "T" clean out every 75 feet as well, and if it does clog, or overfill,, it can overflow out of the t's. I don't care if it backs up and runs through my yard a little in heavy storms, as long as I can keep the flooding away from my driveway, ( which I have already done). We just had a whopper of a rain storm and my yard flooded, but my driveway was dry.
I am 100% that 12 inch pipe will be large enough. a pipe that large will flow a LOT of water.
Thanks for the replies. I don't really think I am skimping here, those adapters are nothing really fancy. Just a necked down big plastic bell. Hard to justify shelling out that kind of coin for something that simple.

Sounds like a good ol red neck fixing. I'd do it...

http://fashionold.com/hu5e.jpg
http://interinsurances.com/huht.jpg

That spot where it goes from 24" to 12" is going to clog

every time.

guaranteed.

The neck down might cause a clog. I'd put in a septic system distribution box. It's stronger than a garbage can and has a grate on top so you can clean it if it clogs. You'd have to cut your own holes but it's less than $70.

Septic System Distribution Boxes & Accessories from Polylok

Those poly boxes are great and all, but if you look at it, they are only for up to 4" pipe. I am dealing with 24". A distribution box was another of my ideas, and I may just look into it, but I really wanted just grass here.
There is a really big cast concrete company close to me, I may just check out some of their stuff after work tonight. That is probably the best solution. I like idea of having a way to clean it out, and service it down the road if I ever have to .
Thanks for the ideas/advice