Least Expensive Wicking Bed Ever!

There was no explanation of what the drain pipe in the center is for, but I drew this concept of what I think is going on here and why this guy in the photo below has such a big wide on.

Fill the tub with sand and cover it with weed cloth before dumping the soil in on top to create a good water reservoir

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This has got to be the least expensive wicking bed ever.

Rob Bob has been using wicking beds for a while.  Here's a video he made demonstrating the method he uses for brassicas.   He top waters his wicking beds and tamps down the soil.

This is the best video I've found about wicking beds