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The magnificent shed now has drains which go to a manhole by the front steps thence to the rainwater harvesting tank. The building never had gutters and drainpipes so we decided to use inconspicuous black gutters and abandon any idea of down-pipes in favour of rain chains. We first saw this idea in Canada on log cabins with overhanging roofs. Less obtrusive than downpipes with lots of bends. We had chunky chains on site so have used them instead. Fun too.