Document Type



Virginia Institute of Marine Science

Publication Date



The City of Norfolk and Norfolk District, U.S. Army Corps of Engineers (USACE), are partnering to conduct a Flood Risk Management Study (FRMS) to determine the Federal interest and feasibility of alternatives to mitigate coastal flooding risk in the City. The FRMS is in the Feasibility Study (FS) phase in which alternatives are proposed and developed to conceptual/preliminary design level, benefit/cost analyses are conducted, and environmental studies are completed to comply with the National Environmental Policy Act (NEPA). The magnitude of the feasibility study will require an Environmental Impact Statement (EIS).

A component of the FS/EIS is the analysis of expected impacts of certain proposed alternatives on tidal circulation and water quality in four water bodies within the City, which include Broad Creek, Hague (Smith Creek), the Lafayette River, and Pretty Lake. The purpose of the modeling is to support the determination of whether the proposed alternatives will have significant impacts on circulation and water quality, and if so, to what degree and what potential mitigation actions may be applied/required. This progress report documents the modeling scenarios, and preliminary model results for the scenarios. The document only provides a brief description of the model results. Dissolved oxygen (DO) levels are compared during spring and summer period at 9 selected stations. The time series comparison for phytoplankton, dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (PO4), and DO are presented at four selected stations. Detailed analysis and discussions will be presented in the final report.



Flood control, risk management, hydrodynamic modeling