is a Graph.
The SAWGraph Hydrology knowledge graph, describing surface water bodies (lakes, rivers, wetlands), the flowlines that connect them, and groundwater features (aquifers, wells, springs) together with their locations. Surface water bodies and flowlines are modeled from USGS NHDPlus data (NHDWaterbody and NHDFlowline); groundwater features are drawn primarily from individual state geological surveys (for example, the Maine Geological Survey). The RDF (Turtle) graph is served through the SAWGraph Hydrology KG SPARQL and Triple Pattern Fragments endpoints.