Storm surge, a failing levee, sea-level rise over decades — all of it comes down to one question: how high does the water get, and what's below that line near you? Drag the water level up and the map floods every acre of the Lower 48 that sits beneath it, drawn straight from a 90-meter national elevation model. Click anywhere to read the ground elevation and how deep the water would be there.
Whether it's storm surge, a levee break, or decades of sea-level rise, the first move is knowing what sits below the line near you.
Raise the water and see what goes under.
Storm surge, a failing levee, or decades of sea-level rise all come down to one question: how high does the water get?
This is bare-earth elevation — it doesn’t model levees, pumps, drainage or wave action. It’s a terrain-limited picture of where water could reach, not a flood forecast.
