| 摘要 |
PROBLEM TO BE SOLVED: To provide a water storage tank capable of feeding rainwater without consuming pump energy and practically requiring no installation space. SOLUTION: This water storage tank 13 has a water storage section 21 capable of storing the rainwater falling on the roof section RF of a building 1. The water storage section 21 can be fitted to the eaves edge 3 of the building 1, and a rainwater introduction port 21a capable of introducing the rainwater falling from the roof section RF is formed on the upper face of the water storage section 21. A rainwater feed port 21b capable of feeding the stored rainwater to a feed water pipe 14 communicating with a rainwater feed object WT is formed on the bottom section side of the water storage section 21.
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