I framed a 4' x 8' bin out of 2x10s and put a pond liner in it. That's my big watering bin.
I am hoping to build flood and drain tables soon, as I convert my high tunnel into a greenhouse for container plants. The drain might actually be optional, if I can put just the right amount of water on to the table so that the plants soak it all up. I would most like to automate that system, but I am not there yet.
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