Thornberry FEMA-LOMR


Greg Massey, PE
Red Plains Professional, Inc.
2933 S. Bryant Ave.
Edmond, OK 73013


Debbie Miller
OKC Public Works Department
420 W. Main
Oklahoma City, OK 73102


Oklahoma City, OK

Thornberry FEMA-LOMR
Thornberry FEMA-LOMR
Thornberry FEMA-LOMR
Thornberry FEMA-LOMR

Project Description

This project involved completing a comprehensive floodplain study, hydraulic models, and topographical maps to apply for a FEMA letter of Map revision. Through Red Plains’ efforts, the result was that FEMA revised the affected Flood Insurance Rate Map and issued a Letter of Map Revision.

This project was completed using the HEC-RAS river modeling program. Red Plains researched the hydraulic information that was used to establish the original floodplain identified on the FIRM map. Using this information, a hydraulic model was created in HEC-RAS that matched the original conditions. The current conditions of the subject area were then studied to develop up-to-date Q values to be used in the study.

A new HEC-RAS model was then developed to demonstrate current conditions and illustrate the revised floodplain region. This information was then transferred to a topographical map to accurately describe the extents of the revised flood plain.

Services Provided