The Harwood Road Bridge over Stocketts Run was severely impacted by high flows caused by Tropical Storm Lee. Located in the Upper Patuxent River watershed, the Stocketts Run drainage area above the Harwood Road crossing is approximately 5 square miles.
A detailed engineering analysis of the existing hydrologic and hydraulic conditions which caused the flood overtopping and bridge deck damage was performed to properly and adequately rate the proposed replacement structure.
WRMA, sub-consultant to MCI, Inc., performed H&H analyses, and stream bank stabilization for the proposed Harwood Road bridge replacement. MCI/WRMA recommended stream bank channel realignment, bank stabilization, and a larger hydraulic opening for the replacement bridge in order to effectively manage the 100-year peak discharge from a rapidly urbanizing Stocketts Run watershed. The WRMA design team utilized GISHydroNXT to determine peak discharges calculated by TR-20 and developed a HEC-RAS model (Ver. 4.1.0) to model the existing and proposed bridge replacement.