| 摘要 |
PURPOSE: To prevent excessive rainwater runoff into stream and reuse rainwater, rainwater is collected and then neutralized in rainwater container by slag. After neutralization, the rainwater is filtrated while passing through filter media. In the end, purified rainwater is introduced into aquifer. CONSTITUTION: The method comprises the steps of (i) the neutralization of rainwater in the first water collecting tank(10) packed with slag(12); (ii) the removal of turbidity by passing neutralized rainwater through the filter medium of a filtration equipment(20) by operating the first pump(22) which is controlled by the signal of the first water level measuring instrument(13); (iii) the storage of filtrated water into the second water collecting tank(30) and the drainage of filtrated water by opening a valve(34) of a drainage pipe(33) which is controlled by the second water level measuring instrument(31). The slag has the average diameter of 10-20mm and is packed to a depth of 1m from the bottom of the first water collection tank.
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