WHAT’S THE DIFFERENCE? The concrete ‘jackstones’ placed in front of the wave deflectors of the seawall along the stretch of the boulevard from Francia to San Vicente saved the structure from excessive pounding of super typhoon Uwan’s storm surge last Nov. 9, 2025. DPWH Sec. Vince Dizon has ordered regional officials to install similar hexapods along the seawall from Francia to San Pablo. Inset photo by PCP Co. shows the more common tetrapods used for the same purpose mostly in Europe and other parts of the world.
