i wish i had gutters on my house, i would do something like this. my thoughts include putting a 5 gallon bucket above the collection barrel, and fill it with gravel of various sizes to act as a "prefilter" to keep out leaves and dirt that could clog the hoses. you also may have to paint the collection barrel black to keep mold from forming.
as long as the bottom of your barrel (or wherever you put the output hose) is above or level with your output at the garden, gravity feed should work great.
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