{ "currentVersion": 11.3, "cimVersion": "3.3.0", "id": 25, "name": "Flowlines", "type": "Feature Layer", "description": "
The National Hydrography Dataset Plus (NHDplus) maps the lakes, ponds, streams, rivers and other surface waters of the United States. Created by the<\/span> US EPA Office of Water<\/a> and the US Geological Survey<\/a>, the NHDPlus provides mean annual and monthly flow estimates for rivers and streams. Additional attributes provide connections between features facilitating complicated analyses.
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For more information on the NHDPlus dataset see the NHDPlus v2 User Guide<\/a>.<\/div>

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Dataset Summary<\/font><\/div><\/span>
Phenomenon Mapped:<\/b> Surface waters and related features of the United States and associated territories not including Alaska.<\/span><\/font><\/div>
Coordinate System: <\/b>Web Mercator Auxiliary Sphere <\/span><\/font><\/div>
Extent: <\/b>The\n United States not including Alaska, Puerto Rico, Guam, US Virgin \nIslands, Marshall Islands, Northern Marianas Islands, Palau, Federated \nStates of Micronesia, and American Samoa <\/span><\/font><\/div>
Visible Scale: <\/b>Visible at all scales but layer draws best at scales larger than 1:1,000,000<\/span><\/font><\/div>
Resolution/Tolerance: <\/b>1 meter/2 meters <\/span><\/font><\/div>
Number of Features: <\/b>3,035,617 flowlines, 473,936 waterbodies, 16,658 sinks<\/span><\/font><\/div>
Feature Request Limit: <\/b>5,000<\/span><\/font><\/div>
Source:<\/b> <\/span><\/font>EPA<\/a> and USGS<\/a><\/div>
Publication Date: <\/b>March 13, 2019<\/span><\/font><\/div>

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Prior to publication, the NHDPlus network and non-network flowline feature classes were combined into a single flowline layer. Similarly, the NHDPlus Area and Waterbody feature classes were merged under a single schema.
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Attribute fields were added to the flowline and waterbody layers to simplify symbology and enhance the layer's pop-ups. Fields added include <\/span><\/font>Pop-up Title, <\/span><\/font><\/span><\/font>Pop-up Subtitle, <\/span><\/font><\/span><\/font><\/span><\/font>On or Off Network (flowlines only), <\/span><\/font><\/span><\/font><\/span><\/font><\/span><\/font>Esri Symbology (waterbodies only), and <\/span><\/font><\/span><\/font><\/span><\/font><\/span><\/font>Feature Code Description. All other attributes are from the original NHDPlus dataset. No data values -9999 and -9998 were converted to Null values for many of the flowline fields.
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What can you do with this Feature Layer?<\/font><\/div>

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Feature\n layers work throughout the ArcGIS system. Generally your work flow with\n feature layers will begin in ArcGIS Online or ArcGIS Pro. Below are \njust a few of the things you can do with a feature service in Online and\n Pro.<\/div>

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ArcGIS Online<\/b><\/div>