National Hydrologic Geospatial Fabric Reference and Derived Hydrofabrics

The National Hydrologic Geospatial Fabric Reference and Derived Hydrofabrics is a geospatial dataset of connected rivers, streams, lakes, catchments, hydrologic locations, and relevant attributes to support multi-scale and integrative hydrologic modeling and analysis.
A hydrofabric is a dataset of common and connected hydrologic features built around high-value community datasets and hydrologic locations. Hydrologic locations are linked to hydrofabric features, with both features and locations populated with persistent identifiers. Hydrologic locations include established sites that measure or report water quantity or quality, structures important to the storage and conveyance of surface water, such as dams and reservoirs, and important connection points such as confluences. Derived Hydrofabrics are geometrically modified versions of the Reference Hydrofabric to suit a specific modeling or analytical purpose. New geometries are created and are linked to the original reference fabric network and POIs.
This data release contains one reference hydrofabric and two derived hydrofabrics designed to meet specific modeling needs with different levels of consolidation and aggregation of features from the reference hydrofabric.
The three hydrofabrics, which are stored and described in their respective child item folders, are the:
1) the Reference Hydrofabric, which contains publicly available hydrologic locations and POIs, mainstem rivers, streams, catchments, and waterbodies with linked persistent identifiers, as well as topological, physical, and geometric feature attributes.
2) the Refactored Hydrofabric, a derived hydrofabric where several user-directed geometric modifications are implemented. Catchments whose flowline length is shorter than a user-defined threshold have been consolidated into larger ones and very large catchments whose flowline length is longer than a user-defined threshold are split into smaller ones to ensure a more uniform distribution of catchment size and flowpath lengths. Additionally, flowline and catchment splits are implemented at important hydrologic locations to represent their network location more precisely.
3) Points of Interest (POI) Aggregated Hydrofabric, a derived hydrofabric where the refactored hydrofabric (described above in #2) has been aggregated around a set of hydrologic locations or POIs.

Each of the three hydrofabrics is described within its metadata, containing a seamless geopackage for the conterminous United States and other files. See individual dataset metadata for more information.