The hydraulic model was then used to examine the effect of proposed conceptual improvements on flooding conditions. Creation of the hydraulic floodplain model along Main Street from Rogers Avenue to the confluence with the Tiber River included the use of one-dimensional (HEC-RAS v.4.1) and two-dimensional (TUFLOW) models to accurately represent the complex flow through the terrain and structures present within the floodplain. McCormick Taylor conducted this three-phased study with Howard County, keeping people’s safety, the preservation of the city’s natural environment and historic character, and community engagement at the forefront. As part of the initial phase Flood Study following a 2011 storm event, McCormick Taylor created a detailed hydraulic model of the flood flows through the Hudson Branch of the Tiber River encountered along Main Street. Couple this with the fact that the city is built on top of the stream and its natural floodplain, along with the changing probabilities associated with intense precipitation events, Ellicott City presents tremendous challenges for meaningful flood mitigation. Located at the confluence of three tributary streams-the Hudson Branch, Tiber Branch, and New Cut Branch-and flanked by the Patapsco River, Ellicott City is surrounded by waterways. The destruction sustained during these two events resulted in loss of life and severely impacted the city’s infrastructure, washing away roadways and damaging streets, sidewalks, and buildings. On Jand then again on May 27, 2018, heavy storm events caused catastrophic flooding along the Main Street and surrounding areas in Ellicott City. However, Ellicott City has been devastated by significant flooding in recent years. McCormick Taylor partnered with Howard County to conduct a Flood Impact Study for the city to mitigate the impacts of future flooding and build a more resilient community. A community established by the milling industry in the late 1700s and steeped with history, downtown Ellicott City, located between Baltimore, MD and Washington DC, is a destination that draws people in with its picturesque boutiques, restaurants, culture, and charming, old-town feel.
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