Flood protection glossary
Definitions used across our research pages and cited in structured data (JSON index).
- Base Flood Elevation (BFE)
- The computed elevation to which floodwater is anticipated to rise during the base (1% annual chance) flood. Structures are often required to be at or above BFE for compliance and insurance.
- Dry floodproofing
- Making a building watertight below the flood protection level so floodwater cannot enter. Deployable barriers are commonly used as dry-floodproofing measures when certified.
- Wet floodproofing
- Allowing floodwater to enter and exit enclosed areas to equalize hydrostatic pressure, using flood-resistant materials and elevated utilities.
- Hydrostatic pressure
- Pressure exerted by standing floodwater against walls and barriers. Increases with depth; barriers must be rated for expected loads.
- Deployable flood barrier
- A removable panel system installed before a flood event and stored when not needed. Contrasts with permanent floodwalls.
- NFIP (National Flood Insurance Program)
- Federal program providing flood insurance in participating communities. Mitigation and compliant floodproofing can affect premiums.
- Flood vent
- Opening designed to allow automatic inflow/outflow of floodwater in enclosed foundations to balance pressure (wet floodproofing).
- BFE
- Abbreviation for Base Flood Elevation; see full definition under Base Flood Elevation.