How to Keep Coastal Floodwater Out of a Basement
To keep coastal floodwater out of a basement, address the route water takes to reach it: surface runoff, low openings, foundation seepage, or drains that back up. Start by mapping your home’s flood exposure and inspecting those entry points, then combine drainage improvements with barriers and basement protection suited to the property. Key Takeaways Flood maps and a walk around the property help identify where coastal water may reach the basement. Keep stormwater moving away from the foundation, and protect low doors and window wells where water collects. Sealing and barriers can reduce entry, but basement walls and floors also need to withstand flood pressure. Plan for drain backups, sump-pump needs, utilities, and safe cleanup before water arrives. Table of Contents How do you assess coastal basement flood risk? How can you keep rain and runoff away from the foundation? How should you protect basement walls, doors, and window wells? What should you do about sump pumps and dr...