Comprehensive interpretation of safety of wide water supply systems

A comprehensive method for safety assessment of water supply systems has been presented. The method includes both conditions of technical exploitation and quality of water delivered to consumers. In the analysis, the system capacity, appearance of failures on water mains as well as the chloroform concentration in transported water were taken into consideration. Four disjoint safety states have been defined (FS - full safety, ASM - acceptable safety menace, CSM - controlled safety menace, SL - safety loss) of water supply system. Moreover, the probabilities for the system to be in each of these states at the moment t were derived based on the Markov processes.