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Coles County, Illinois | GregWCIL: Took me a little time find the specs. The new 24" was installed @ .17 % grade. I have to assume the old tile is somewhat similar as the outlet depth is the same and where we've interconnected the two in a couple places. The new 18" replacing the 14" Ys out from the 20" & 24" had to be installed @ .125% it drains 230 acres. The 24" ends where the new 18" attaches.
The 24" size was determined by a civil engineer as the project was subsided by a county highway project.
The 20" and the 24" work together and there's about 200 acres that have their own outlets to the open ditch.
Edited by Herbie56 6/17/2015 08:44
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Pattern Tiling and Drainage District Tile
