If ground water is also compromised, the World Health Organization warns, the threat will be even harder to mitigate.
A system of drainage by which the ground water was brought to the same level under both stables made them equally healthful.
Contamination of the soil, ground water, and air by percolation of sewage.
The ground-water surface is the name given the upper surface of ground water, the level below which all rocks are saturated.
In the figure the stream would become dry if the ground water level sank to A' A'.
The zone in which the work of ground water is thus for the most part destructive we may call the zone of solution.
By studying a spring one may learn much of the ways and work of ground water.
This increases the susceptibility to softening from storm water or ground water.
ground water stands low and wells must be sunk deep to find it.
When it falls, the ground water surface is depressed, and the water in the wells becomes lower.