Summary of PRI and NRI solutions for WDS-II in the cost range of ≤$5 million Cost rangeResilience metric# of solutionsAvg. cost ($)Norm. mean pipe size (mm)Avg. std. dev. of pipe sizes (mm)
(a) $0–1.7 M NRI 20 1.6 M 249.6 221.5 PRI 34 1.59 M 246.1 229.7 (b)$1.7–2.4 M NRI 60 ∼2 M 309.8 230.4
(c) $2.4–5 M NRI 99 3.54 M 466.9 296.0 PRI 215 3.51 M 479.4 270.5 Cost rangeResilience metric# of solutionsAvg. cost ($)Norm. mean pipe size (mm)Avg. std. dev. of pipe sizes (mm)
(a) $0–1.7 M NRI 20 1.6 M 249.6 221.5 PRI 34 1.59 M 246.1 229.7 (b)$1.7–2.4 M NRI 60 ∼2 M 309.8 230.4