CRMP AppendixB Impact Assessment Methodology

<p>This document provides a technical overview of the approach and methods used to assess potential flooding impacts in Phase II of the Virginia Coastal Resilience Master Plan (CRMP). Phase II of the CRMP builds on the approach and methods of Phase I (Dewberry, 2021), with an expanded set of flood hazards, updated asset data sources, and refined impact metric calculation methods. The impact assessment produces quantitative data that characterizes how Virginia’s people and landscape will be affected by flood hazards, now and into the future, accounting for sea level rise (SLR) and shifting precipitation regimes. The impact assessment incorporates the hazard data from the Phase I coastal hazard framework, the Phase II pluvial hazard framework, and Federal Emergency Management Agency (FEMA) Special Flood Hazard Areas (SFHA). The impact assessment uses these sets of hazard data and results from the asset data gathering effort to produce information that decision-makers can leverage to address flood risk.</p>