water table 
noun
The level below which the ground is saturated with water.I learned later that these boreholes, which were dug by cattle ranchers and reached down 100 meters and more, had lowered the water table....
- Not only does trout farming make use of saline groundwater, it could help lower the water table and reduce groundwater's salt content.
- This has resulted in a dramatic drop in the water table.
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- Senufo