This bachelor's thesis presents a comparative analysis of the white tank and black tank waterproofing systems used in the construction of an underground water reservoir. The aim of the thesis is to present the structural and technological characteristics of both waterproofing systems and compare their performance in terms of watertightness, durability, construction complexity, and economic aspects. The theoretical part describes the operating principles of both systems, the materials used, design requirements, and the execution of construction and expansion joints. The practical part is based on a case study of an underground reservoir designed for the VRS K. ETRA high-bay warehouse project, where both construction technologies are compared. The cost analysis assumes identical structural geometry and comparable quantities of excavation, concrete, and reinforcement, with differences arising primarily from the different approaches to achieving watertightness. The results show that the white tank system requires high-quality watertight concrete and more precise execution of construction joints, whereas the black tank system relies on an external waterproofing membrane. Although some individual components of the white tank are more expensive, the comparative analysis showed that, for the case study considered, the construction of the black tank was approximately 3,0 % more expensive due to the additional waterproofing works and protective layers. The findings provide a useful basis for selecting an appropriate waterproofing system in the design of similar underground structures.
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