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I've stopped using the rolled corrugated pipe, I've found it crushes too easily. Depending on how much stone you have, just the weight of the stone can crush it. To answer your question, yes, a french drain can be constructed without pipe, but as NCSULandscaper points out, pipe improves flow and can compensate for any obstruction that might infiltrate the stone in the future. I always put perforated pipe in the bottom but I use PVC. It runs about $4 for 10' section
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