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 Rainwater and air conditioning condensate flow through a series of roof drains into one 18-inch pipe that comes off the building and into a filter that removes sediments. |
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 The water flows into a cistern, a series of three underground storage tanks that each hold 18,000 gallons. Excess water is diverted to the storm sewer. |
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 Water is pumped to the irrigation system. An outside spigot also will allow landscaping crews to fill their water tanks. |
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