| 摘要 |
PROBLEM TO BE SOLVED: To provide a rainwater storage facility preventing such an accident that refuses are caught by a valve element and a valve cannot be closed and of stably and naturally discharging a specified amount of rainwater irrespective of the stored amount of water. SOLUTION: This rainwater storage facility comprises: a rainwater storage tank for temporarily storing rainwater; and orifice discharge tubes for naturally discharging the stored rainwater from the side of the rainwater storage tank. The rainwater storage facility comprises the plurality of orifice discharge tubes. An on-off opening and closing valve is installed in each orifice discharge tube. When the stored rainwater is discharged, the quantity of the orifice discharge tubes for opening the opening and closing valves is automatically controlled according to the level of the rainwater stored in the rainwater storage tank. COPYRIGHT: (C)2009,JPO&INPIT
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