This study would present a risk analysis method to evaluate stable tap water supply in a multi-regional water supply
system and propose a measure for the evaluation of the effect of the conjunctive operation of the multi-regional water
supply system using this. Judging from the vulnerability for the crisis response of the entire N. multi-regional water supply
system, as compared to the result of Scenario 1 in which no conjunctive pipes were operated, it was found that in
Scenario 2, in which conjunctive pipes were partially operated, the vulnerability of crisis response decreased by about
30.6%, and as compared to Scenario 3, the vulnerability of crisis response decreased by 86.2%. In setting a plan for
stable tap water supply in N multi-regional water supply system, using the estimated value and the method for the
evaluation of the vulnerability of crisis response by pipe, by interval and by line, it is judged that this can be utilized
as a basis for the judgment of the evaluation of the operation or the additional installation of conjunctive pipes.