| 摘要 |
PROBLEM TO BE SOLVED: To provide a rainwater storage facility using one storage tank as a common tank for a water utilization tank and a flood control tank. SOLUTION: The rainwater storage facility has one storage tank 2; a rainwater lead-in means for leading rainwater into the storage tank; a discharging means 4 for discharging water in the storage tank; and a stored water amount control means 5 collecting meteorological information and controlling the stored water amount of the storage tank based on the collected meteorological data. The stored water amount control means predicts and computes the amount of rainwater flowing into the storage tank from the information obtained time onward from the predicted amount of rain obtained based on the meteorological information. When there is a possibility of overflow of rainwater flowing into the tank by comparing with the residual space capacity of the storage tank, the amount of stored water in the storage tank equivalent to the amount of overflow is discharged before rainfall beyond a preset rainfall reference value is observed. When there is no possibility of overflow or no influence on a downstream water area even if overflows, a discharge stop state is held so that the storage tank functions to be utilized as the water utilization tank while maintaining a flood control function. COPYRIGHT: (C)2007,JPO&INPIT
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