Per NE Herp’s suggestion, I put a tube down through/past the drainage layer, so I can siphon excess water out with small tubing if necessary. I didn’t have 3/8” tubing handy, but I did have 1/2” PVC. I cut a piece to length, and took a 45-ish-degree bevel off the end, so it wouldn’t sit completely tight to the floor and make it hard for water to get into the drainage riser. My saw of choice is a Japanese-style saw, which cuts on the pull stroke. I usually use a pipe cutter for PVC, but they’re buried in the workshop side of the basement, due to making a path for a new washing machine. The saw, OTOH, was out and available.
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