Groundwater
All that water which occurs below the surface of the earth in one form or another,that is,as water moving down to greater depths under the influence of gravity,or moving in columns and thickness of saturated rocks,the aquifers under definite hydrostatic pressure or flowing as underground streams etc,is broadly grouped as subsurface water.the water occuring in definite rock bodies and fully saturated them below a level is further distinguished as groundwater.
Groundwater ,like surface waters,is also a very powerful natural agent responsible not only for modifying the existing features but also for creating many other geological features on and below the surface of the earth.
Geological work of ground water may be conveniently studied under two headings, namely chemical work,which is more important and the mechanical work.
