My father has a 200 or so gallon gray water tank that was used for sheep at one point in time... it was also used as a rain water collector that had a gravity fed line running to a ~50 gallon drinking station for sheep and goats.
The water collector for it and 11 other tanks was the broadside of a barn, literally. (all 12 tanks on one side, but the "gutter" system on the barn ran into a central pipe that had 6 outlets, each of which branched into a Y to feed 12 tanks.)
Because of the height of the barn, getting up there to clean it would be nearly impossible as often as it would be required... therefore, the farmer just made a filter system to keep anything larger than particulate matter out of the water.
The rain gutters had caps and screens on them, they were one of the first types of "no maintenance" gutters.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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