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Arc Hydro for EPA Basins David R. Maidment, University of Texas at Austin Dean Djokic, ESRI, Redlands • Implement Basins on Arc Hydro now for a region of interest • Examine new environmentwide modeling approaches for specific constituents e.g. Mercury, bacteria Hydrologic Information System Hydrologic Modeling Arc Hydro Geodatabase Arc Hydro Extension for EPA Basins • Arc Basins – – Builds on core Arc Hydro landscape representation – Provides additional feature datasets and tables to store Basins data Arc Hydro Feature classes Basins feature classes Arc Basins as one geodatabase Arc Basins as two related databases Connect these two databases using relationships Geodatabase stores geographic feature classes Relational database stores purely tabular information National Water Information System Web access to USGS water resources data in real time Arc Hydro Toolset Ver 1.0 Provides tools for processing raster and vector data and populating the attributes of the Arc Hydro data model Arc Hydro USA • Arc Hydro Framework dataset for USA at 1:500,000 scale • Built from USGS and National Weather Service data • HydroPoints are active USGS stream gaging stations ArcGIS Hydro Data Model Drainage System Hydro Network Flow Time Time Series Hydro Features Channel System Streams Drainage Areas Hydrography Channels Terrain Surfaces Rainfall Response Digital Orthophotos Thematic Layers supporting the Arc Hydro data model (from Michael Zeiler “Modeling Our World” Volume 2) Data Model Based on Behavior Follow a drop of water from where it falls on the land, to the stream, and all the way to the ocean. Integrating Data Inventory using a Behavioral Model Relationships between objects linked by tracing path of water movement Hydrologic Information System Hydrologic Analysis and Modeling Arc Hydro Geodatabase Other Arc Hydro Implementations • USGS – Stream Stats • HEC – GeoRAS – GeoHMS Streamstats Conclusions • Chief innovations of ArcGIS – Network, geodatabase, object modeling • Chief innovations of ArcHydro so far – – – – HydroNetwork New raster tools and methodology HydroID – relationships Integration of Time and Space in a single system • Geodatabase – convenient for working with large vector datasets (use larger packaging units than 8digit HUC’s) Arc Hydro for EPA Basins David R. Maidment, University of Texas at Austin Dean Djokic, ESRI, Redlands • Implement Basins on Arc Hydro now for a region of interest • Examine new environmentwide modeling approaches for specific constituents e.g. Mercury, bacteria