4.2.1. Scenario-Based MCDA

Table 7 shows the MCDA results of nine indices according to different scenarios. In Scenario 1, AD and PHRI showed high correlation coefficients from MCDA, which indicates that these indices appropriately quantify the system performance under the single pipe failure condition. In a similar way, under Scenario 2 (system-wide water consumption increase), hydraulic indices (RI, MRI, and API) show great performance; while for Scenario 3 (single-node fire flow), the hydraulic indices still show better performance than other indices but, overall, correlation coefficients were lower than those of the other scenarios.


**Table 7.** Correlation coefficients obtained by scenario-based MCDA.

Note: The values highlighted in yellow indicate high correlation coefficient of 0.95 or higher.
