The geology of soil water and ground water, with particular 
emphasis on the chemistry and movement of water.
Hydrogeology is the study of groundwater – its origin, occurrence, 
movement and quality. Groundwater moves through the sub-surface
from areas of greater hydraulic head to areas of lower hydraulic
head. The rate of groundwater movement depends upon the
slope of the hydraulic head (hydraulic gradient), and intrinsic
aquifer and fluid properties. The ground-water system
must be understood in relation to both surface water and
moisture in the atmosphere. Most addition to ground water
come from the atmosphere in the form of precipitation.
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