I want to thank everyone for their inputs! After talking with our engineer he believes the Ohio Department of Natural Resources won't approve our dam design (that still sounds funny!) unless we use concrete due to the weight of the dirt on top of the pipe. I'm fine with that as I really want to enjoy the lake when it's completed and I don't want to have to worry about the pipe cracking or collapsing.
Thanks, again, to everyone who responded! I'll be back at some point once we break ground...or if I have some further questions! God bless!
