Culvert Issues, help!

[HawkinsHollow]

I have a small stream on my property that I was not able to cross due to it being too steep and deep. I decided to put a culvert in. Fast forword a few years and I think I am regretting my decision. You see this area on my property is along a creek and floods 1-5 times a year. To exacerbate this issue, this culvert is basically at pond level. I think what is happening is as a flood is happening the first step is water is coming through this area with quite a bit of force. By that time the pond level has raised a bit and water cannot and does not flow through the culvert it flows over it, washing away the dirt covering it.

In hindsight I think a crossing would have been better. And that is the direction I think I might take going forward. I was thinking about taking 2 or 3 4" pipes and putting them in the concrete pipe. After that crushing the pipe to make the majority of the crossing and then sloping each side accordingly. The 4"ers will allow the tiny trickle of water that is going thru this area 99% of the time to come thru. Is that a fools errand? Are these pipes just going to clog? I think I already know the answer to this. My other idea was leaving the pipe but armoring the area better with concrete chunks and hoping that holds the dirt in place. How would you proceed?

 

[HawkinsHollow]

Ok, I have another idea. What about leaving the bottom third of the pipe in place. Filling it with the rubble, allowing water to flow through. Then sloping either side appropriately and armoring with concrete chunks.

 

[thclimer]

I think you would be better off removing the culvert and trying to harden the area where it was. Either pouring concrete or with large sone. Something like in the picture below but no where near as elaborate. It would allow the water to flow over it but also a hardened surface that allows you to cross it and if there is a huge flow it doesn't get washed away:

 

[HawkinsHollow]

I think you would be better of removing the culvert and trying to harden the area where it was. Either pouring concrete or with large sone. Something like in the picture below but no where near as elaborate. It would allow the water to flow over it but also a hardened surface that allows you to cross it and if there is a huge flow it doesn't get washed away:

View attachment 3191602

Yep! I think that is the plan. That is what I should have done in the first place. Live and learn!

 

[EddieWalker]

If it was my place, I would keep that culvert in place and build up the entrance to the pipe with sacks of concrete. Just stack them dry so the water cannot get around the pipe, and then hammer some rebar through the sacks to lock them in place.

Then I would do the same thing at the exit side of the pipe. This should hold your material better when the water overflows the pipe.

Instead of using dirt over the pipe, I would get the largest crushed concrete that I could find and build up the road over the culvert with that. Once compacted, the crushed concrete should lock together and allow water to flow over it.

If I was getting really crazy, I might even add a few sacks of Portland Cement to the crushed concrete with some sand and work it into everything to make it even stronger.

 

[newbury]

You need an "emergency overflow".
How important is it to get across the stream? And what is the flooding like?
Do you need to be able to rescue someone on the other side? Or can it wait a few days or weeks?
The soil pictured has a lot of "fines", these settle in slow water. And clog culverts.
And Eddie is spot on. Block the flow, make it go elsewhere
It looks like you have a good culvert. If you can create a shallow ditch a ways off to the side of the culvert that handles the storm overflow it should handle the

5 times a year

major flows. This was a common practice for "farm" ponds when I grew up.
Good luck.
Keep us posted please.