Slicker than a Yes album. | In our clay (similar to Paul's) we just put the tile in. Water has amazing hydraulic capabilities, eventually it should find its way to the easy flow. I'd imagine that super tight clay exists, so the need for rock in the trench. The smaller the pipe, the more grade is needed to flow the same amount. However, as long as one end is higher, it will drain, just takes a bit longer with smaller pipe. We put in a lot of 5" years ago, now we are at 4" and 70 foot intervals. If you have a big ditch, it's best to dig through it once, so the fewer the mains the better. It also has to be sewer pipe or dual wall tile. Needs to be heavier to hang there and withstand drifts.
Keep asking questions, I think you know this is a good place to find answers.
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Would drainage tile work in Alberta?
