Anthony Theodorou & Company

Floodplain Management, Environmental Clearances, and Water Resource Modeling

ATAC teams with Dakota Headwaters to provide Certified Floodplain Management and Water Resource modeling, with 7+ years delivering hydrologic/hydraulic modeling, FEMA floodplain compliance, and drainage design on municipal, county, and DOT projects across the Northern Plains and Black Hills. 

We are proficient with CLOMR/LOMR/LOMR-F submittals, 1D/2D HEC-RAS, HEC-HMS, HY-8, ArcGIS/ArcGIS Pro, and LiDAR workflows. Experienced aligning designs with South Dakota DANR stormwater permits, SDDOT’s Drainage Manual, and FEMA Region VIII policy, coordinating as needed with the USACE Omaha District for Section 404/10 activities.

Our services include floodplain modeling, CSO and SSO control, inflow and infiltration studies, diversionary structure design, detention pond design, stormwater best management practices, and stormwater pump station design.