Base Level Engineering (BLE) Tools and Resources

Tools, templates and resources in the searchable list below assist communities for the local review and incorporation of Base Level Engineering datasets in their floodplain management activities. These tools connect up with BLE data available, free-of-charge, on the interactive on-line portal, known as the Estimated Base Flood Elevation (estBFE) Viewer. 

There are various resources assist in the collection, review and utilization of the data to promote risk reduction and smart growth initiatives across the nation.

Search for Resources

Resources below are intended for use by state, tribal and local elected officials, technical community departments/staff, engineering and development industry, community and natural hazard planning staff across the nation. 

Using the FEMA Region 6 Estimated Base Flood Elevation Viewer (estBFE Viewer)

This resource explains each option for exploring BLE data in the estBFE Viewer. It includes steps for navigating each option.

Utilizando el Visor de Estimación del Nivel de Inundación Base (estBFE Viewer, por sus siglas en inglés)/Using the FEMA Region 6 Estimated Base Flood Elevation Viewer (estBFE Viewer) (en español)

Este recurso explica cada opción para explorar los datos BLE en el estBFE Viewer. Incluye pasos para navegar cada opción.

What is Base Level Engineering?

This resource explains what BLE is, how BLE data can be used, and where to access the data.

¿Qué es la Ingeniería De Nivel Base (BLE, por sus siglas en inglés)?

Este recurso explica que es la BLE, cómo se pueden utilizar sus datos, y dónde se puede acceder a ellos.

Pages – State Quick Guide

Intended for consistent release of BLE across the nation. Provides materials for incorporation into existing State Quick Guides. Connects with estBFE Viewer.

Flash Card – BLE Data Downloads

Assists in determining which downloads contain the information you need. Connects with estBFE Viewer.

Flash Card – BLE Vector GeoDatabase

Provides insight to the various spatial datasets available in the Vector Geodatabase. Connects with estBFE Viewer.

Flash Card – BLE and LOMAs

Steps on how to create site specific report and use it for LOMA submittal. Connects with estBFE Viewer.

When to Use BLE

BLE may be used in a number of situations. This document overviews when BLE may be applied for use based on the guidance for best available information use.

BFE Interpolate Tool

Excel file with programming to assist locals in determining BFE for structures outside floodplain. If you need further assistance accessing this document, please contact Diane Howe at diane.howe@fema.dhs.gov.

Informed Land Development with BLE

This resource covers floodplain management processes for permitting and development. It shows how BLE data can be used to help inform these processes and meet permitting requirements.

Local Permitting Checklist

Tool provides the basis for local floodplain development reviews, refers to FIRMs and Base Level Engineering information.

Fact Sheet – Water Surface Elevation Grids

Describes what information is included in a Water Surface Elevation Grid and how they can be used by various user groups.

Fact Sheet – Flood Depth Grids

Describes what information is included in a Flood Depth Grid and how they can be used by various user groups.

BLE, Social Media & Flood Risk Awareness

Communication resources and social media content to promote flood risk awareness and BLE data use.

BLE and Letters of Map Revision

Provides details on how to review effective FIRMs and BLE data to determine Base Flood Elevations for both LOMA and LOMR-F submittals.

LOMA (Out as Shown)

Connects with Map Service Center, National Flood Hazard Layer and estBFE Viewer.

HOW2 Find the Right HEC-RAS Models

Offers step-by-step instructions to find and download HEC-RAS models from the Estimated BFE Viewer.

HOW2 Find the Right BLE Spatial Files

Offers step-by-step instructions to find and download spatial files from the Estimated BFE Viewer.

Base Level Engineering (BLE) and Letters of Map Amendment (LOMAs)

This resource covers when you may need to request a LOMA and how you can use BLE data in the process.

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