Evaluation of water budget changes in a terrority of Poland

The groundwater level, as it is essential for a social development and resist, need to be monitor permanently. A water budged determination is a form of evaluation of water state in a tested area. A water budget computation is based on a assessment of evapotranspiration and state of land surface hydrosphere. A source of data for a groundwater state are both, geodynamics (like a GRACE model) and land hydrosphere (like GLDAS model) models . Both of them are analysed in the paper. The resultant water budget was also determined and presented graphically, moreover statistics and tests were performed.