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 Anywhere falling rain doesn't soak in to the ground, the runoff can be collected. So if you have a roof, you have a collection area.
Determining how much water your roof collects can involve lots of complex calculations. But all you really need to do is figure how much water your garden will need and if your roof can collect that much. The gardener who's going to irrigate a large vegetable patch in the desert Southwest will need a lot more water than the one dousing a few container plants on a patio in the Midwest.
The rule of thumb is the average 25 foot by 40 foot home roof sheds about 600 gallons of water in an hour of moderate rainfall, around 1 inch. If you have two downspouts, they'll each divert about 300 gallons of water toward the barrel under them. The more barrels you have, the more of this water you can collect.
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Transportation System | Storage Facility | Harvesting Rain Water
Barrels Sources | Build your own
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