NDRAM allows users to zoom in and visually display current flood risks, both approximate floodplains from BLE and effective regulatory floodplains from FEMA’s NFIP. This new tool also provides users water surface elevations, flood depths, and the ability to download engineering model data and print customized maps making it useful for planning, mitigation, and disaster recovery actions.
The Base Level Engineering (BLE) data is a FEMA Non-Regulatory product that is meant to provide additional information beyond those products that appear on a FEMA Regulatory Flood Insurance Rate Map. The BLE production approach combines high-resolution ground elevation data, and modeling technology advancements to create engineering models and flood hazard data. These analyses are produced at a large scale as opposed to targeting individual stream reaches. The flood hazard information prepared is based off engineering models that determine base flood elevations, water depth, and water velocity along each stream reach studied.