| 摘要 |
PROBLEM TO BE SOLVED: To provide a recharge well improved in constitution to maintain excellent recharging performance over a long period of time by easily and effectively eliminating particles plugging a filter layer and the ground near the well by recharging treatment (condensation) when washing. SOLUTION: The filter layer 3 is formed in a plurality of layers 3a-3c arranged to gradually reduce the grain diameter of a granular filter material 30 horizontally outward from a screen part 4'. The screen part 4' is formed of an opening 40 inclining downward to an inner diameter part 4a from an outer diameter part 4b and enlarging a clearance dimension. COPYRIGHT: (C)2008,JPO&INPIT
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