Baltimore County Floodplain

Brudis & Associates, Inc. (BAI) was responsible for conducting detailed floodplain studies for watersheds located in Baltimore County, Maryland. BAI developed detailed hydrology and hydraulic models based on existing conditions and ultimate conditions for revising floodplain boundary delineations.

Windlass Run Floodplain Study: BAI developed detailed hydrology and hydraulic models based on existing conditions and ultimate conditions for revising floodplain boundary delineations and establishing the base flood elevations (Zone AE) along Windlass Run. The study area was approximately a 3 mile reach, and the current special flood hazard area for the study area is designated as Zone A on FEMA’s Flood Insurance Rate Map. LiDAR data and field topographic survey were used to delineate the watershed and set parameters for hydrologic and hydraulic models for Windlass Run. BAI developed an initial TR-20 hydrologic model based on the existing conditions, which was included in the GISHydro 2000.

Moores Branch Floodplain Study: The study area included a reach length of approximately 8,300 feet. Hydrologic analysis for the 2.2 square mile watershed was conducted using StreamStats program. BAI developed a HEC-RAS model for the 2-, 10-, 50- and 100- year, and ineffective flow areas both upstream and downstream of structure crossings were specified based on flow patterns, bridge/culvert openings, channel/floodplain geometries, and the roadway elevations. Model results were utilized to revise the base floodplain delineation, and BAI also delineated the 100-year floodplain boundaries. BAI ensured that the WSEL matched the elevation contours.