Where is elevation on piles or columns most advisable?

Elevating structures on piles or columns is particularly advisable in areas with high potential for flood velocities or waves because this design approach effectively reduces the impact of floodwaters on the structure. Elevation helps ensure that the building's lowest floor is above the anticipated flood level, thereby minimizing the risk of damage from both standing water and strong currents.

In regions where flood velocities and wave action are a concern, elevating on piles allows the structure to sit above potential debris and turbulence, providing greater stability and resilience against potential flooding scenarios. This is crucial for maintaining the integrity of the building while also ensuring the safety of its occupants.

Elevating structures in areas above the base flood elevation is also important, but it does not specifically address the challenges posed by high flood velocities or waves. Urban areas with no expected flooding do not necessitate such protective measures, and building in zones where construction is prohibited does not align with floodplain management principles that seek to promote safety and reduce flood risk.