Can my house flood if it is not in a mapped floodplain?
Yes. A flood map shows the areas expected to flood in certain storms, but water can reach houses outside those areas through drains, saturated ground, garages and low openings. Virginia Emergency Management found that many of the homes flooded in Matthew were outside the mapped floodplain.
The map is drawn from models of how a river or coast would flood, and it may not show what happens when a city's drains are overwhelmed or the ground is already full of water. A house can take water from the street or the yard even if the nearest river or creek is some distance away.
The practical point for a homeowner is that the map is one piece of information and not a guarantee. Ask about entry points rather than about the map alone, and check the low spots, the drains and the openings in your own house, because they decide how water would reach you.
Why do so many homes flood outside the map?
Floodwater rarely follows a single line. It moves along streets, through drains, under thresholds and across saturated yards, and a storm can overwhelm the drainage system long before a river reaches a house. The map does not capture these paths in every case.
Heavy rain on ground that is already wet cannot soak in, so the water runs off into the nearest low point. If that point is a drain that is full, the water finds another route. Streets that carry water toward a house, or a yard that slopes toward the foundation, can become a path even without a river nearby.
Older drainage systems, paved surfaces and altered landscaping can all change how water moves. The map is not designed to track those local changes, which is why a technician looks at the house and the ground around it rather than relying on the map.
Will my homeowner insurance pay for water that came in from outside the floodplain?
That depends on your policy. Many standard homeowner policies generally exclude flood water from rising surface water, while water that enters through a storm-created opening may be treated differently. Read your policy and ask your insurer directly, because the outcome depends on the wording.
The distinction between flood water and other water is often the central question in a claim, and it is decided by your policy and the insurer, not by the crew. A technician can record the source and the entry point clearly, which helps the insurer make its decision.
If a claim is denied or stalls, try to resolve the matter with the company or agent first. If the problem remains, the Virginia Bureau of Insurance, part of the State Corporation Commission, accepts homeowner complaints. This page does not state what any particular policy pays.
What should I do first if my home flooded but the map said it was safe?
Call for water extraction and drying, keep out of standing water, and photograph the entry points and the damage before anything is moved. Do not assume the map was right, and do not assume the water is gone just because the surface looks dry.
Start by making the building safe, shutting off the power at the panel if you can reach it safely, and keeping children and pets away from the water. Then look for the entry point. Note whether the water came in at a door, a window, a vent, a drain or through the ground.
Call the line and describe the entry point as well as the rooms that are wet. A crew that knows where the water came in can take readings in the right places, and the readings are the best evidence of what has happened to the house.
What does a crew do differently when a house flooded from the ground up?
A crew measures the crawl space, the cellar and the slab edge along with the living space, because water that rises from the ground can wet materials that look dry from above. Drying is planned around the lowest materials first.
Water that comes up from saturated ground often enters at the foundation and works its way up through the subfloor and the bottom of the walls. The crew checks the sill plate, the joists and the wall base, and it records the readings at each level.
The drying plan follows the water upward. Equipment is set low in the room and at the wall base, and the crew checks the upper walls only after the lower materials have begun to respond. A dry floor does not prove a dry structure, and the readings show when the whole building has reached its target.