The most dangerous water is behind your seawall, not in front of it.

Hydrostatic Pressure: diagnosed and explained.

Everyone watches the waves, but seawalls are usually beaten from behind. Water is heavy, over eight pounds per gallon, and when rain, irrigation, and tidal seepage saturate the soil behind a wall, all of that weight starts pushing outward. Engineers call it hydrostatic pressure, and walls are designed to shed it through weep holes and drainage rather than carry it. The trouble starts when those relief paths clog with soil or marine growth, or were never adequate to begin with. Then the pressure builds silently after every rain and every high tide, and the wall begins to show it: cracks opening where stress concentrates, sections bowing or leaning outward, water weeping through the face long after the tide has dropped. There is a second cost, too. Water that finally forces its way out through cracks and joints carries soil with it, so the same pressure that strains the wall also undermines the ground behind it. A wall fighting hydrostatic pressure is losing on two fronts at once, which is why relieving that pressure is step one of nearly every seawall repair we design. Pressure management is plumbing before it is structure: the water behind the wall needs a way out that does not carry soil with it. Where pressure has already carved voids or pushed the wall, hydrophobic foam injection stabilizes the saturated ground, and anchoring into stable soil restores the resistance the pressure has been beating. A free wall evaluation checks your weep holes and drainage first, because relieving the pressure is often the cheapest repair on the list.

For the repair side of this, the seawall repair solutions page lists every method Dalinghaus installs, including the ones that fix problems other than hydrostatic pressure.