In June 2005, Halff Associates, Inc. was selected by the Federal Emergency Management Agency (FEMA) to produce county-wide Digital Flood Insurance Rate Map panels (DFIRMs) for McLennan County as part of the FEMA nationwide Map Modernization Program.

The Flood Insurance Study will include re-mapping of the flooded areas identified on the effective Flood Insurance Rate (FIRM) maps for all incorporated and unincorporated regions of McLennan County. DFIRMs will eventually replace the current FIRMs and will include GIS database information related to the underlying base maps and technical data, although paper copies of the FIRMs will still be available for use.

The study will update approximately 1122 miles of Zone A study streams, redelineation of approximately 205 miles of Zone AE study streams, and incorporate 42 miles of detailed studies finalized from the City of Waco Master Drainage Study.