20151202 18252600 1.0 TRUE The available source databases are:<ul><li>US 30m, which is derived from the 30m National Elevation Dataset (NED) for the continental United States, and</li><li>90m HydroSHEDS for the world between 60 degrees north and 56 degrees south, plus some areas in Canada and Alaska north of 60 degrees</li></ul>To use the Hydrology Analysis Services, please see the instructions on the respective content item pages:<a href='https://www.arcgis.com/home/item.html?id=8e48f6209d5c4be98ebbf90502f41077' rel='nofollow ugc' style='color:rgb(33, 117, 155);' target='_blank'>Watershed</a> <a href='https://www.arcgis.com/home/item.html?id=5314c23c24484c68ac961f8772be813b' rel='nofollow ugc' style='color:rgb(33, 117, 155);' target='_blank'>Trace Downstream</a> Esri processed the source data and derived additional layers required to support high performance and scalable watershed delineation and downstream trace tasks. The source data were the same elevation, Hydrologic Unit boundaries, streams and waterbodies that were used by the Environmental Protection Agency and US Geological Survey to produce NHDPlus V2.1 for the conterminous United States (released in 2012). Sinks were filled unless they fell within a <a href='https://nhd.usgs.gov/wbd.html' rel='nofollow ugc' style='color:rgb(0, 121, 193); text-decoration:none;' target='_blank'>Watershed Boundary Dataset (WBD)</a> closed basin, ensuring that flow will only terminate in endorheic regions. The Esri hydroconditioning process differs from the NHDPlus V2.1 process; therefore the resulting watershed delineations and downstream traces do not always match those from NHDPlus V2.1.The 90m resolution <a href='https://worldwildlife.org/pages/hydrosheds' rel='nofollow ugc' style='color:rgb(0, 121, 193); text-decoration:none;' target='_blank'>HydroSHEDS</a> data, which was produced by the World Wildlife Fund Conservation Science Program in partnership with the U.S. Geological Survey, the International Centre for Tropical Agriculture, The Nature Conservancy, and the Center for Environmental Systems Research of the University of Kassel, Germany. HydroSHEDS is generally accepted to be the most comprehensive global hydrological data set.Additional informationFor more information about the NHDPlus V2 or HydroSHEDS data processing, please email <a href='mailto:HYDROTEAMRC@ESRI.COM' rel='nofollow ugc' style='color:rgb(0, 121, 193); text-decoration:none;' target='_blank'>HydroTeamRC@esri.com</a>.<div> </div> HydrologyWatershedDownstream TraceHydroWaterWater ResourcesRiverTraceDownstreamflowlandscapewaterwater resourceswatershedtrace downstreamearth observations Pop-up layer for the current coverage of the Watershed and Trace Downstream Ready-to-Use services in the Hydrology Toolbox. Source: USGS, EPA, Esri, WBD, NHD, WWF <img src='https://downloads.esri.com/blogs/arcgisonline/esrilogo_new.png' /> This work is licensed under the Esri Master License Agreement. <div><a href='https://goto.arcgis.com/termsofuse/viewsummary' rel='nofollow ugc' target='_blank'>View Summary</a> | <a href='https://goto.arcgis.com/termsofuse/viewtermsofuse' rel='nofollow ugc' target='_blank'>View Terms of Use</a></div> 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