What role do bench marks play in floodplain management?

Benchmarks play a crucial role in floodplain management by establishing a consistent elevation reference for surveys. They serve as fixed reference points that can be used to determine the elevation of land relative to a base flood elevation (BFE) or other significant elevation metrics critical to flood risk assessment and management. This consistency is vital for accurately mapping floodplains, understanding flood risk for properties, and ensuring compliance with federal, state, and local floodplain management regulations.

Having a reliable elevation reference allows communities and property owners to assess whether structures are at risk of flooding and helps in planning for development in ways that mitigate flood risks. It also plays a key part in the administration of the National Flood Insurance Program (NFIP), ensuring that building and zoning practices are aligned with established flood risk data. Benchmarks are thus fundamental to effective floodplain management and planning efforts.