Which action is NOT typically part of modifying existing buildings in flood-prone areas?

The action of increasing the height of buildings without flood considerations is not typically part of modifying existing buildings in flood-prone areas because it may not adequately address the specific flood risks present. When modifying buildings to better withstand flooding, it is crucial to ensure that any alterations take into account the base flood elevation and other floodplain management criteria.

Modification efforts generally focus on enhancing a building's resilience to flooding, which includes actions like retrofitting for flood resistance, relocating buildings out of high hazard areas to reduce risk, or installing flood warning systems to improve preparedness. These actions have a direct connection to minimizing flood damage and ensuring safety.

In contrast, increasing the height of buildings without considering their flood vulnerability may result in structures that are still susceptible to flood impacts or that do not comply with local floodplain regulations. Such actions could inadvertently exacerbate flood risks rather than mitigate them, making this choice not aligned with effective floodplain management practices.