This is the second year we're using this system of capturing run-off water and funneling it through our greenhouse. If you have already have a hoop, you know the incredible amount of runoff created by even an 1" of rain. Outside on the right side, we dug a channel and intermittent opening along the wall. We then dug a corresponding channel inside, slopping it so water runs to the center isle and into the keyholes. At the far end, to the left of the opening/door is a board that stops water from escaping. The board is slipped out for the water to escape and move to an outside garden. Super simple and surprisingly effective.
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