| 摘要 |
A COLLECTING WELL (1) CONSISTS OF A MAIN TUBE (10) EXTENDING INTO A GROUND (12) AND DEFINING A PLURALITY OF FIRST HOLES (14) ABOUT ITS LOWER PART, A LAYER OF GRAVEL (16) FORMED AROUND THE MAIN TUBE (10), A SUCTION PIPE (18) EXTENDING INTO THE MAIN TUBE (10), A PUMP (20) PROVIDED AT A LOWER END OF THE SUCTION PIPE (18), AND THREE FLUSHING PIPES (22) EXTENDING INTO THE LAYER OF GRAVEL (16) AND FIXED THEREIN. EACH OF THE FLUSHING PIPES (22) DEFINES A PLURALITY OF SECOND HOLES (222) ABOUT ITS LOWER PART AND IN ALIGNMENT WITH THE FIRST HOLES (14). (FIG. 2)
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