What are two key considerations during an encroachment review in a floodway?

During an encroachment review in a floodway, it is essential to determine if the project will obstruct flood flows and assess the potential for downstream flooding. The floodway is the portion of the floodplain that carries the highest velocity of floodwaters, and any encroachment can significantly impact flood dynamics. Evaluating whether the project will cause an obstruction allows decision-makers to foresee any negative consequences that may arise from altered flood patterns, including increased flooding risks to adjacent properties and areas downstream.

Furthermore, checking for downstream flooding helps in understanding how the proposed project could exacerbate flooding issues in other locations. This consideration is critical because it ensures that the integrity of the floodway is maintained and that the overall flood management goals are achieved. In contrast, the other options focus on factors that do not directly relate to the crucial hydrological impacts of a project within a floodway, such as aesthetics, noise, or tax implications, which are not primary considerations in floodplain management.