Surveyor uses outdated flood map causing elevation errors in Davidson County

The Stormwater Management Commission meeting held on March 6, 2025, in Nashville, Tennessee, focused on critical discussions surrounding flood elevation mapping and its implications for construction in flood-prone areas. A significant point raised was the reliance on outdated flood maps by surveyors, which has led to incorrect base flood elevation determinations.

During the meeting, a representative highlighted that a previous surveyor had used February 2001 flood maps, which indicated a base flood elevation of 414.2 feet, instead of the updated 2017 maps that show a base flood elevation of 415.2 feet. This discrepancy resulted in incorrect benchmarks being set for construction projects, potentially putting properties at risk.

The commission discussed the importance of using current data, noting that the National Flood Insurance Program has undergone several updates since 2001, including new maps released in 2017 and 2022. The need for accurate floodplain management was emphasized, particularly as the U.S. Army Corps of Engineers is currently reviewing the Cumberland River's base flood elevation, which may rise by 2.2 feet.

To address these issues, the commission has implemented a certified floodplain surveyor program aimed at ensuring that surveyors are well-trained in using the most current flood data. The meeting underscored the necessity for contractors and developers to stay informed about floodplain regulations and the potential consequences of using outdated information.

In conclusion, the discussions at the Stormwater Management Commission meeting highlighted the ongoing challenges in floodplain management and the critical need for accurate flood elevation data to protect Nashville's communities from future flooding risks. The commission's efforts to improve training and update flood maps are essential steps toward enhancing public safety and effective land use in flood-prone areas.