Pre-Cast Culvert Box Closures - Solid Block? CMU? Steel Plates?

[JoelTXCive]

The master drainage plan for a community has changed.

As a result, I need to close off some RCB culverts between community equalization basins (amenity lakes).

There are total of 7 Culverts that I need to close off, and they vary in size from 6x4 RCBs to 8x8 RCBs.

Since these are equalization basins, I will have the same head on both sides of my closure wall. Below is an example of 1 location...

Question:

What do you think the best/easiest way to close off the boxes?
[ul]
[li]I could do solid concrete blocks?[/li]
[li]~6" CMU?[/li]
[li]Steel Plates?[/li]
[li]Maybe the pre-casters have some ideas?[/li]
[/ul]

Other things to consider:

1) The chamfer at the corners seems like it would cause headaches. We would have to cut brick there and grout a bunch I guess.
2) I can dowel into the boxes, but I doubt I could embed anything more than 4" in.

I have googled this, but not come across any details. Surely, I'm not the first person that has closed off boxes?

Thank you for any ideas in advance.

 

[JedClampett]

If you're confident that the head is the same on both sides, theoretically you could put in a PVC or HDPE membrane, battened around the perimeter. Maybe add a few vertical or horizontal members to stiffen it and keep it from billowing.

 

[dik]

I think that 80 mil EPDM... would work really well as long as there are no water born projectiles... poke a hole in it to make sure the level is the same on each side. Secure using tapcons with a batten.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[cvg]

i think you need to plan on the possibility of unequal water levels or possibility of damage by other unknown means
cost is not that much more to put in a thicker plug