Answer: The distance your barrel is from the garden isn't as important as the drop in elevation, so if you install a rain barrel, set it up so it is several feet above ground level and gravity will effectively move the water through the hose. I don't think it will come out of the end of the hose in a mad rush, but it should flow freely enough to make watering quick and efficient. If, after trying your new rain barrel, you want to increase the water pressure, you can either elevate the barrel more or set an immersible pond pump into the barrel. Some are solar powered, but they aren't cheap so I'd vote for elevating the barrel!
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