Vulnerability Assessment as a Basis for Sanitary Zone Delineation of Karst Groundwater Sources—Blederija Spring Case Study

The application of groundwater vulnerability methods has great importance for the sanitary protection zones delineation karstic sources. Source assessment karst mainly relied on European approach (European Cooperation in Science and Technology—COST action 620), which includes analysis K factor, refers to water flow through saturated zone system. In paper, two approaches have been applied, COP + TDM (Time-Dependent Model) methods, produce most suitable source map that can be transformed into maps. Both were tested case example Blederija spring Eastern Serbia. This represents a classical with allogenic autogenic recharge. Dual aquifer recharge points out necessity inclusion method created especially groundwater. Obtained maps show similar results, particularly ponor areas, these are important future protection. brings three classes directly zones. Contrary previous one, uses travel time as degree. results final easily used define considering different national legislation.