Flood Risk and the Need for Operational Risk Assessment Frameworks

Climate change is altering precipitation regimes, hydraulic variability, and the frequency of extreme rainfall events. This leads to increasing flood risks around the world. Traditional flood risk assessment approaches rely on historical climate baselines. These baselines have become less reliable under nonstationary climate conditions. Research shows that flood hazards have increased and are driven by interacting mechanisms, including extreme precipitation, altered runoff time, and compound flooding processes where multiple hydrological drivers co-occur. Adaptation strategies such as nature-based solutions, blue-green infrastructure, and improved drainage systems are being evaluated for their capacity to reduce climate change impacts. Advances in operational flood risk systems and analytic tools that include machine learning and sensitivity-based planning approaches offer new opportunities to translate climate information into decision-relevant warning and preparedness frameworks. However, gaps remain in integrating changing climate signals with operational risk assessment and impact-based communication. This study examines how climate change has altered flood risk and evaluates evidence-based adaptation. Alongside adaptation, operational risk assessment approaches designed to enhance flood preparedness, warning effectiveness, and resilience are also a part of this study. Through synthesizing current research on hydraulic change, compound flooding, analytical modeling, and risk communication, the project supports the development of climate-informed, decision-ready flood risk management strategies. This capstone project, evaluates the relationship between rising atmospheric CO₂ concentrations, temperature, precipitation, and flood impacts in Virginia from 1950 to 2024. Using descriptive statistics, correlation, regression, and lagged analyses, the study examines whether climate-driven variables are associated with measurable changes in flood frequency, property damage, and fatalities. In addition, a structured narrative synthesis of operational flood risk assessment frameworks is conducted to translate statistical findings into decision-ready planning guidance. The project will produce a practitioner-oriented white paper, statistical figures and tables, and an operational flood risk framework to support climate-informed resilience planning in Virginia.