As part of the Federal Emergency Management Agency's Floodplain Modernization Program, a partnership has been assembled to develop a state-of-the-art system to compute storm surge elevations FEMA Region III coastal waters for floodplain analysis, as required by FEMA. Â Experts in the fields of coastal storm surge, wind-driven waves, Geospatial InformationÂ Systems, and high-performance computational systems are working together in this effort to establish new base flood elevations. Â The project partners include:Â US Army Corps of Engineers Duck Field Research Facility, Renaissance Computing Institute (RENCI), ARCADIS, Ocean Weather Inc, UNC-Chapel Hill Institute of Marine Sciences, Applied Research Associates/IntraRisk, and Dewberry and Davis.The overall approach has been to assemble the pieces of system to enable the computation of still water levels using recent developments in similar projects (e.g., North Carolina Floodplain Mapping Program, Louisiana Coastal Protection and Restoration/FEMA). Â The primary components include assembly of a state-of-the-art Digital Elevation Model (DEM) that mergesÂ the latest LIDAR surveys of FEMA Region III coastal counties and available bathymetric data sets,Â from which the numerical model grid topography and bathymetry are derived; advanced numerical models for storm surge, oceanic and near-shore wave fields, and tropical cyclone wind fields are combined into a flexible software framework on RENCI's high-performance computer systems; development of the necessary hurricane parameter representations through application of the Joint Probability Method (JPM); and post-processing statistical methods for derivation of return periods from the computational results and JPM statistics. Â This document describes the development of the DEM and vertical datum analysis, numerical model grid generation, tropical cyclone statistical development, and archival strategy of the computational results.