Low w/c ratio enable high-performance material to have higher power, permeation decrease, and strength.

https://www.scribd.com/document/978343666/Hurricane-Season-Prep-Best-Concrete-Mixes-to-Withstand-Heavy-Rain-180745

High-performance concrete offers enhanced strength, permeability reduction, and durability through low w/c ratios, silica fume, and advanced admixture blends.