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Considering how much work it is to dig the trenches, and considering that you will be conveying concentrated surface runoff from the downspouts, I would not use the typical flexible corrugated pipe. (The stuff you buy in 100 foot rolls from Home Depot). The corrugated pipe has to be laid on a nice steady slope. If there are any low spots, they tend to fill with silt and the pipe clogs. I've dug up enough poorly laid field drain tile to observe this clogging first hand. My preference would be type 2729 PVC drain and sewer pipe. This has the advantage that you can glue the sections together, it is much easier to lay with a steady slope, and it has a smooth interior surface more resistant to clogging. You can buy filter fabric "socks" to pull over the pipe if you are laying perforated pipe. All plastic pipe has about the same strength, so far as crushing goes. The weight of vehicles is carried by the soil, not by the pipe. The soil forms an "arch", which carries the forces around the pipe. The deeper you can bury the pipe, the better. The corrugated pipe is appropriate if you are doing a whole field, or if you are a contractor and need to keep your costs down. But I personally hate the stuff.
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