The aquifer of karst is very vulnerable to different types of pollution, therefor any unreasonable dealing with it may result in permanent consequences. The bad results of pollution underground are mostly inaccessible for people and because of that they are quite difficult to repair. For its efficient protection it is necessary to undertake proper actions which have to base upon adequate understanding, how karst aquifer is functioning. Karst region with its charasteristics and specifics demands a detailed research, supported by collecting terrain samples and checking the quality of water. The measures, which are necessary for protection of environment, are including also beaulding of ZBDVs for rainfall water from highways. The Čebulovica-Srmin highway sections is described in detail, including a list of ZBDVs for drainage system protection. Basic features of ZBDVs are stated in tabular form. This highway section is furnished with a total of 28 ZBDV. They are devided on four sections: Čebulovica-Divača, Divača- Kozina, Kozina-Klanec and Klanec-Srmin. On this subsections you can see the developement of realization ZBDV depending on timing of highway construction. In greater detail ZBDVs near Škocjanski park and in IV. waterprotecting belt of river Rižana are presented. Effectiveness of ZBDVs is presented with ZBDV which has a mark 4/59 and is located near Divača. The further development and traffic increasement of the region is unavoidable. But within planning and realization of the highway, special attention must be payed to the special values of the area, which rises from both: the natural conditions and the culture of the people
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