Groundwater

 **Groundwater** is any water found in soil and in lower lying works, with the exception of chemically bound water or the rock crystal. Frequently, they fill the voids within the rock, filling it like a sponge. For exceptional cases should include the presence of underground rivers or reservoirs of a similar nature to the lakes. This is possible mainly in karst areas, where water rinsed vast emptiness in the rocks. The study deals with groundwater hydrogeology.

 Classification of groundwater

 Groundwater can be classified on the basis of which occur in the soil. Shallowest - in the vadose zone - there is water vapor, water and hygroscopic pellicular  A similar operation 65%

 Occurrence and characteristics of groundwater  surrounding the grain, water filling the micropores and capillary water, suspended, deposited on the surface of spatially-limited layers of impermeable rock.

 Subsoil water - they are closely related to the zone of aeration (aeration). Due to the presence and absence of shallow horizons impervious, insulating them from the surface, are easily influenced by ambient - temperature changes and fluctuations in resources. Water may freeze. High susceptibility to contamination causes that they tend to be unfit for human consumption.

**Ground water** - are below the vadose zone. They mirror freely, subject to significant fluctuations periodically. After prolonged rainfall of the mirror clearly states after a period of drought is reduced, leading often to the dry wells. With inflation by a few, and some places even couple of miles permeable layers of rock, water is the natural filtration and is relatively clean.

 **Deep water** - occur in aquifers are capped by impermeable songs. They are characterized by having a mirror tight. Its shape is forced by the lower surface of the overlying layers. The temperature of groundwater may correspond to an annual average of the area, while further increases in accordance with the degree of geothermal.