| 摘要 |
PURPOSE:To efficiently pump up underground water, by a method wherein a normally-operating deep well, bored in a site, is operated according to a water level in a water level observation control deep well, bored in a site, detected in the well and an input condition fluctuating in linkage with an excavation depth. CONSTITUTION:When it is detected by means of a void water pressure gauge 1a in a water level observation control deep well A bored in a site that a water level in the deep well A exceeds a set water level, a relay switch 6 is actuated according to an instruction from a microcomputer 2, and a deep well pump 5a in the deep well A is driven to hold a water level at a constant value. When a water level in an observation well W outside a site exceeds a planned water level for a landslide protection wall, alarm is sounded by means of an alarm buzzer. |
