Groundwater. Importance of Groundwater. Supplies 40% of U.S. public drinking water. Almost all rural residents Agriculture can be dependent on groundwater for irrigation. Shapes the land surface (e.g. sinkholes, mudslides). Fig. 17.3. Occurrence of Groundwater.
Unsat. – pores filled with air and water
Sat. – pores filled with only water
Quarries/mines must be dewatered while operating.
The water table also drops when water is pumped from wells.