Base Level Engineering (BLE) Status

The map and tables below show progress and development of new BLE products as of 2/8/2021. This information is subject to change as the projected BLE progress and schedule are contingent on many factors including federal funding availability, partnering agency involvement, and evolving prioritizations. The TWDB will be updating this data quarterly and will include any changes that have developed.


BLE Status Map for Texas watersheds

Status Map

This interactive map application provides the current progress of BLE development throughout the state. For watersheds with status 'complete' (meaning BLE development is complete for that watershed) access and download the BLE modeling files and results by going to FEMA's Estimated Base Flood Elevation Viewer.

Current BLE Status

  Complete In Progress Planned Total
HUC 8s in Texas 35 66 107 208
State Funded BLE 2 30 98 130
Cooperating Technical Partner (CTP) Funded BLE 2 16 0 18
FEMA Funded HUCs 31 20 9 60
1D BLE 34 16 0 50
2D BLE 1 50 107 158
  • HUC stands for Hydrologic Unit Code and is a unit of measurement for watersheds determined by the United States Geological Survey. HUC-8s are very roughly the size of Texas counties.
  • 1D and 2D are terms for different flood modeling methods.

Proposed BLE Schedule

BLE Status TWDB FEMA
Complete 4 31
FY21 25 19
FY22 36 1
FY23 38 7
FY24 45 2
Total 148 60
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