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RE: Seasoned With Sult N Papper : June 1, 2019> Hello, I am new here or at least it feels that way.
Yes, storm sewers are still mainly concrete but a company called ADS ( Advanced Drainage Systems) has a double wall smooth poly pipe that is up to 60" in diameter that is getting specified now for storm drain use in a lot of new areas being built. It is so much easier to work with and the cost is right in line with the concrete piping when all things are considered.