When I had a bunch of barns with steep roofs, I had gutters installed and placed huge 500-1,000 gallon water troughs at each drainspout. It doesn't take too much rain off a steep roof to fill those tanks. I was using them to water livestock and arranged my paddocks so that each paddock had a barn corner with a drain spout. It was actually a clever design. The house drainspouts watered a huge koi pond and some big trees.
Just be sure you add some minnows or goldfish to the tanks for mosquito control. They do a great job eating larvae.
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