Flood Model Assessment and Hurricane Inundation Map Display
Case Study City of Gloucester, Massachusetts
This article was originally published by Applied Geographics Inc. (AppGeo), a company acquired by The Sanborn Map Company Inc in September 2022.
AppGeo’s ongoing work with the City of Gloucester, Massachusetts highlights our ability to pull together important flood-related data and display it in a user-friendly manner for the general public and city officials to consume.
Project Dates: 2012 – ongoing
Project Description and Outcome: AppGeo has been working with the City of Gloucester to support all aspects of GIS and geospatial IT since 2002. Gloucester is a coastal community with a populated downtown that has some very low-lying areas directly on the water. The City of Gloucester can be greatly impacted by hurricanes or other flooding events. AppGeo began working with Gloucester on various projects related to flood model data, inundation data, and watershed delineation in 2012. In particular, AppGeo collaborated with the City of Gloucester on the following projects:
Displaying various flood-related layers and hurricane inundation details on MapGeo. AppGeo worked with city officials to determine which flood and hurricane layers were most important to display on the city map. AppGeo then pulled these layers from different sources and made them available on the city’s unified mapping platform (MapGeo). These layers provide key information about potential flooding and inundation to city officials and the general public.
Flood Model Assessment / Updates. AppGeo worked with the city to assess the FEMA flood inundation models to make any needed adjustments and improvements.
Watershed Delineation. AppGeo used detailed Lidar and DEM data to develop citywide watershed data.
Evacuation / Hurricane Inundation Assessment and Development of Evacuation Routes. AppGeo performed an assessment of inundation modeling to determine which areas of the city would be isolated during a flood event. This information was used to develop evacuation routes and create a prioritized evacuation plan.
AppGeo’s Performance: In addition to the flood-related work described above, AppGeo also provides many other forms of spatial IT and GIS support to the city that meet the city’s need for current data, custom tools and applications, and for project management and quality control on the work of other suppliers of GIS data. Among the tasks completed between 2002 and today are:
Updated orthogonal Imagery and conducted LiDAR survey of the city.