Posted 2/21/2017 17:08 (#5854429 - in reply to #5854230) Subject: RE: Tile Spacing
Cavalier, ND
You're not getting the same drainage coefficient. 4" flow capacity will be more than double a 3" installed identical grades. So you need a little more than twice the footage in laterals of 3" to equal the flow of a single 4" lateral.