The goal of the PhD thesis is to develop a model, methods and metrics that enable quantitative evaluation of electric power and telecommunications infrastructure critical impact on the water supply infrastructure, and to verify the correctness of the approach developed for а real infrastructure example. In the first chapter, the task approach is defined and the literature that describes different approaches used to simulate the critical infrastructure interdependencies is analysed. In the second chapter of the thesis, a research on carried out of critical infrastructure modelling and simulation studies is made, furthermore, applied metrics and their relationships with the model chosen and the type of dependencies, applied in research and projects, are evaluated. The third chapter of the thesis examines the quantitative characteristics of the critical infrastructures interaction and performs the analysis and classification of metrics. In the fourth chapter metrics approbation is done, exploring a specific example of the three infrastructures interdependences (electricity, telecommunications and water supply network), using the simulation model. The chapter conducts simulation analysis of the results and conclusions of the use of metrics and of possibility of the infrastructure parameters optimization to minimize the negative impact of the interdependencies. The fifth chapter analyses the challenges faced implementing critical infrastructures computer control methods, using wireless sensor networks, and describes the technical solutions that are tailored in the reviewed projects. The thesis is written in Latvian on 155 pages, contains an introduction, five chapters, conclusions, five annexes, 58 pictures and 8 tables. The bibliography contains references to 91 source of information.