If a developer downstream wants to build a subdivision, what is one option available to them for determining base flood elevation?

Conducting a flood study at their expense is a valid and reliable option for a developer who wants to determine the base flood elevation (BFE) in a proposed subdivision area. This approach involves comprehensive analysis and evaluation of hydrological and hydraulic data tailored specifically to the site in question. It provides definitive and site-specific information regarding flood risks that could affect the property.

Such a study typically includes modeling of flood scenarios, assessment of rainfall runoff, and examination of local waterways to understand how they interact during flood events. This kind of detailed study is crucial for ensuring compliance with floodplain management regulations and for establishing appropriate building elevations that mitigate flood risks. Relying on neighboring properties, using newspaper archives, or assuming an area is flood-free lacks the rigor and specificity required for accurate floodplain management and could lead to compliance issues and increased risk for future development.