20230914 13401200 1.0 TRUE Riverine_Water_Surface_Grid_01_PCT The layers presents the predicted water surface elevation during a 1-percent-annual-chance flood (also referred to as a 100-year flood) in Baltimore County. This grid is derived from FEMA's Flood Risk Database. Baltimore County Preliminary Riverine Depth Grids Federal Emergency Management Agency, Preliminary Digital Firm Insurance Rate Map (DFIRM): 8/12/2020.