water LOL
Ground water.
Could it be a spring or artesian well?
Through a process called infiltration: water that seeps into the soil is called groundwater.
infiltration
It can be called either infiltration or permeability.
Toxic Water Contamination of the Sao Francisco River
Water Exercises: Deep Water Crunches and Rolls
The Case Against Water Privatization
The Global Causes of Water Scarcity