HarleySilo had poorly draining red clay in Georgia. He dug a trench
like you describe and filled it with mushroom compost plus other stuff,
IIRC. He used roll-roofing for mulch that extended out beyond the sides
of the bed to keep it from becoming a bathtub in the rain.
If you have raised beds, the rain will drain down until it hits the clay, then
seep sideways out around the edges of the raised beds.
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