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A GIS-Based Information System for Predicting Impacts from Coastal Storms-The Coastal Impact Assessment Tool (CIAT), Version 1.0, User's Manual, U.S. These case studies highlight additional information gained through performing a detailed, discretized analysis using TopCAT. The results compare well (generally within 6%) with previous investigations. The second case investigates the alongshore volumetric beach sand change caused by hurricane Bonnie (1998) for an 85km section in the Cape Hatteras National Seashore, North Carolina. The first case examines coastal cliff retreat for a 500m section in Del Mar, California and shows that large failures comprised a large portion of the total eroded volume and the average retreat rate does not provide a good estimate of local maximum cliff retreat. To demonstrate the capabilities of TopCAT two case studies are presented herein. TopCAT was specifically designed for the morphological analysis of seacliffs and beaches but may be applied to other elongated features which experience topographical change, such as stream beds, river banks, coastal dunes, etc. This paper discusses the development of a new GIS extension named the Topographic Compartment Analysis Tool (TopCAT), which compares sequential digital elevation models (DEMs) and provides a quantitative and statistical analysis of the alongshore topographical change.