Thanks for the thoughts guys. I have determined that our local govt will "install" these but I get to pay for it.
I appreciate the thoughts on ditch fires and I think that will drive us to stay with steel. This ditch is the roadside ditch to a county road and only will access our property. There is a permit process but our county for the most part just wants to discourage shoddy work so I think as long as I build it right, we won't have a problem. I can tell you there is no land that drains into the ditch and my neighbor is at the top of the small hill with no culvert at all. The only thing that ditch drains is itself and half the road crown.
I know there is some math here but I crunch numbers for a living and this seems rather straight forward. I effectively have about 500ft of road and half of the road drains in this ditch so I would account for a conservative 30ft from centerline of road and 500ft length. That would be 15000sf of area so a 1" rain would be about 9300gal of water. I will work the numbers a bit to get a nice low restriction flow and I think 12-15" will do well. A big rain here might be 2"/hr or about 310gpm in that culvert.
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