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Shared Enterprise Geodata and Services (SEGS) provides an EPA-curated collection of recommended geodata assets that are nationally relevant and support the Agency’s mission to protect human health and the environment. By connecting EPA users with curated datasets and promoting service reuse, SEGS aims to enhance information access, reduce data-storage costs, and improve the consistency and quality of data at the US EPA.
This SEGS content item depicts the Median Height Above Nearest Drainage (HAND) by Block Group for the continental United States, developed by RTI and EPA. These data were downloaded from the Oak Ridge National Laboratory Continental Flood Inundation Mapping Data Repository for HAND and processed by RTI to calculate median HAND values for each Block Group.