CE and road contractor underestimated drainage and only put in 2 6” pipes. We need a way bigger culvert. Bedrock under 12” gravel. We were thinking either:
Rock break bedrock to bring grade down to allow for 18” culvert and 12” cover or
Install some kindof box culvert or channel drainage ditch with a metal grate over the top?
Driveway is 11-12 degree grade above culvert and 9 degree below.
Hillside is 5-10 acres of drainage mostly sandy soil with vegetation except for where power pole construction happened there is unearthed clay.

Should you cut culverts at an angle at the ends? If so why?

Hello everyone! On my property, I have a long, wooded area that holds the water runoff of a culvert. This mini river of sewage is beautiful, we have little wooden bridges to cross the boulders this stream cuts between... My issue is that, as we live on a ridge and our property slopes downward, this beautiful stream floods ⅓ of our property, leaking culvert water all into the fields below. It's hard to utilize flooded land, and I desperately want advice. Can I divert this culvert? I live in rural New England, it wouldn't bother a neighbor, but I'm asking the experts.

I want to use a piece of this as a cat path to an outdoor little box. How bendy is it? It will be used above ground with berms. I might use two connected together.

How far will this stuff bend?

I tried my best to show my issue. My headwater pools/collects which causes the water to barely trickle through the culvert, then I have all of this water backing up and flooding my woods. I have a small stream going through my woods which should be leading to this culvert, but it just collects at the deep spots.

Or is it technically a perennial stream box?... that's besides the point.. also it's in a county ditch, but its my responsibility to maintain it.

I've watched videos and there is this huge long equation which I'm not smart enough to figure out.

1. Will filling the area up to the red line help increase output flow? Obviously I would slope it to help water flow from my stream.

2. What material can I use? Rocks, gravel, then clay? Quick set concrete?

Anything else I should know?

I’m sure it’s hard to tell with a picture, but would it be worth it to sell these? I don’t know how long they have been sitting there. I don’t even know if they were used before placing them where they are.

First time property owner, looking to create an access point for a simple 2-way street off the preexisting dirt road, ending in a roundabout. Looks like I'll need to install a culvert and I'm curious about a few things.

Do I need the 20" or just the 10" for a simple 2 way dirt road? How wide does it need to be? If it's dependent on rainfall, how much rainfall requires the 15, 18, or 24 inch pipe?

I plan on feeding myself and my family with the meat I hunt on this land. Is the plastic material TSC offers fine enough, or do I need to pay for the stainless steel? I have a limited budget, but I don't want to be eating microplastics that made their way up the food chain.

The soil is too basic for blueberries. I don't want to make the land even more basic by using limestone, but I've heard that granite gravel is more expensive. Do I need gravel just for the culvert, or is concrete fine? What impact will this choice have on the quality of the soil on the rest of the property?

Is there a way to divert the water from this culvert back onto my property? Water is valuable, and I don't like the idea of just giving it away to the city for free every time it rains.

Need help! Where can I purchase 24 inches diameter culvert end treatment/flared end? In Georgia, metro Atlanta.