What is the main consequence of hydrodynamic forces during a flood?

The main consequence of hydrodynamic forces during a flood is that they weaken building foundations. During a flood, the flow of water can exert significant pressure on structures, which may not be designed to withstand such forces. This pressure can cause soil erosion around foundations, leading to instability. As water moves rapidly, it can undermine the structural integrity of buildings by displacing the supporting soil, which can result in serious damage or even collapse.

While other consequences like erosion, wave creation, and debris accumulation are indeed relevant factors during floods, they do not directly address the specific impact hydrodynamic forces have on the stability of building foundations. Understanding the influence of hydrodynamic forces is essential for floodplain management and for designing structures that can withstand flood conditions effectively.