| 摘要 |
PROBLEM TO BE SOLVED: To provide a water supply device promoting economic efficiency for the use of water by efficiently making use of natural water in a water storage device. SOLUTION: When a water level in a water storage tank 10 is lower than a first water level L1, a control circuit 17 operates a motor pump 27 to supply ground water in a natural water tank 21 to the water storage tank 10, and the water level in the water storage tank 10 is raised up to a maximum water level L3. When the water level in the water storage tank 10 is lower than a second water level L2 due to the shortage of the ground water or the trouble of a natural water supply device 20, the control circuit 17 connects a solenoid valve 15 to supply city water to the water storage tank 10, and the water level in the water storage tank 10 is raised up to the maximum water level L3. When the city water is supplied, the dissolution of the shortage of the ground water or the trouble of the natural water supply device 20 can stop the supply of the city water by closing the solenoid valve 15 by detecting the ground water flowing through a water supply pipe 11. COPYRIGHT: (C)2004,JPO
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