USA SSURGO - Soil Hydrologic Group
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<div>When rain falls over land, a portion of it runs off into stream channels and storm water systems while the remainder infiltrates into the soil or returns to the atmosphere directly through evaporation.</div><div><br /></div><div>Physical properties of soil affect the rate that water is absorbed and the amount of runoff produced by a storm. Hydrologic soil group provides an index of the rate that water infiltrates a soil and is an input to rainfall-runoff models that are used to predict potential stream flow.</div><div><br /></div><div>For more information on using hydrologic soil group in hydrologic modeling see the publication <a href='https://www.nrc.gov/docs/ML1421/ML14219A437.pdf' target='_blank' rel='nofollow ugc noopener noreferrer'>Urban Hydrology for Small Watersheds</a> (Natural Resources Conservation Service, United States Department of Agriculture, Technical Release–55).</div><div><br /></div><div><div><div><div style='text-align:left;'><font size='4'>Dataset Summary</font></div><div style='text-align:left;'><b>Phenomenon Mapped:</b> Soil hydrologic group<br /></div><div><div><b>Units:</b> Classes</div><div><b>Cell Size:</b> 30 meters</div><div><b>Source Type:</b> Discrete</div><div><b>Pixel Type:</b> Unsigned integer</div><div><b>Data Coordinate System:</b> WKID 5070 USA Contiguous Albers Equal Area Conic USGS version (contiguous US, Puerto Rico, US Virgin Islands), WKID 3338 WGS 1984 Albers (Alaska), WKID 4326 WGS 1984 Decimal Degrees (Guam, Republic of the Marshall Islands, Northern Mariana Islands, Republic of Palau, Federated States of Micronesia, American Samoa, and Hawaii).</div><div><b>Mosaic Projection: </b>Web Mercator Auxiliary Sphere</div><div><b>Extent:</b> Contiguous United States, Alaska, Hawaii, Puerto Rico, Guam, US Virgin Islands, Northern Mariana Islands, Republic of Palau, Republic of the Marshall Islands, Federated States of Micronesia, and American Samoa.</div><div><b>Source:</b> <a href='https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/?cid=nrcs142p2_053627' target='_blank' rel='nofollow ugc noopener noreferrer'>Natural Resources Conservation Service</a></div><div><b>Publication Date: </b>November 2023</div><div><b>ArcGIS Server URL:</b> https://landscape11.arcgis.com/arcgis/</div></div></div><div><br /></div><div><div><div><font><span style='font-size:17px;'>Data from the </span></font><a href='https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/geo/?cid=nrcseprd1464625' target='_blank' rel='nofollow ugc noopener noreferrer'>gNATSGO database</a><font><span style='font-size:17px;'> was used to create the layer for the for the contiguous United States and Alaska. The remaining areas were created with the </span></font><a href='https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/home/?cid=nrcs142p2_053628' target='_blank' rel='nofollow ugc noopener noreferrer'>gSSURGO database</a><font><span style='font-size:17px;'> (Hawaii, Guam, </span></font><font><span style='font-size:17px;'>Puerto Rico, the U.S. Virgin Islands</span></font><font><span style='font-size:17px;'>, Northern Marianas Islands, Palau, Federated States of Micronesia, Republic of the Marshall Islands, and American Samoa).</span></font></div></div><div><br /></div>This layer is derived from the 30m (contiguous U.S.) and 10m rasters (all other regions) produced by the <a href='https://www.nrcs.usda.gov/wps/portal/nrcs/site/national/home/' target='_blank' rel='nofollow ugc noopener noreferrer'>Natural Resources Conservation Service</a> (NRCS). The value for hydrologic group is derived from the gSSURGO map unit aggregated attribute table field Hydrologic Group - Dominant Conditions (hydgrpdcd).<br /></div></div><div><br /></div><div><div>The seven classes of hydrologic soil group followed by definitions:</div></div></div><ul><li><b>Group A</b> - Group A soils consist of deep, well drained sands or gravelly sands with high infiltration and low runoff rates.<br /></li><li><b>Group B</b> - Group B soils consist of deep well drained soils with a moderately fine to moderately coarse texture and a moderate rate of infiltration and runoff.<br /></li><li><b>Group C</b> - Group C consists of soils with a layer that impedes the downward movement of water or fine textured soils and a slow rate of infiltration.<br /></li><li><b>Group D</b> - Group D consists of soils with a very slow infiltration rate and high runoff potential. This group is composed of clays that have a high shrink-swell potential, soils with a high water table, soils that have a clay pan or clay layer at or near the surface, and soils that are shallow over nearly impervious material.<br /></li><li><b>Group A/D</b> - Group A/D soils naturally have a very slow infiltration rate due to a high water table but will have high infiltration and low runoff rates if drained.<br /></li><li><b>Group B/D</b> - Group B/D soils naturally have a very slow infiltration rate due to a high water table but will have a moderate rate of infiltration and runoff if drained.<br /></li><li><b>Group C/D</b> - Group C/D soils naturally have a very slow infiltration rate due to a high water table but will have a slow rate of infiltration if drained.</li></ul><div><div><div style='text-align:center;'><div style='text-align:left; background-color:rgb(255, 255, 255); margin:0px; padding:0px;'><font size='4'>What can you do with this Layer?</font> </div><div style='text-align:left; background-color:rgb(255, 255, 255); margin:0px; padding:0px;'><br /></div><div style='background-color:rgb(255, 255, 255); text-align:left; margin:0px; padding:0px;'><div style='margin:0px; padding:0px;'>This layer is suitable for both visualization and analysis across the ArcGIS system. This layer can be combined with your data and other layers from the <a href='https://livingatlas.arcgis.com' target='_blank' rel='nofollow ugc noopener noreferrer'>ArcGIS Living Atlas of the World</a> in ArcGIS Online and ArcGIS Pro to create powerful web maps that can be used alone or in a story map or other application.</div><div style='margin:0px; padding:0px;'><br /></div><div style='margin:0px; padding:0px;'>Because this layer is part of the <a href='https://livingatlas.arcgis.com' target='_blank' rel='nofollow ugc noopener noreferrer'>ArcGIS Living Atlas of the World</a> it is easy to add to your map:</div><div style='margin:0px; padding:0px;'><ul><li>In ArcGIS Online, you can add this layer to a map by selecting <i>Add</i> then <i>Browse Living Atlas Layers</i>. A window will open. Type "soil hydrologic group" in the search box and browse to the layer. Select the layer then click <i>Add to Map</i>.<br /></li><li>In ArcGIS Pro, open a map and select <i>Add Data</i> from the Map Tab. Select <i>Data</i> at the top of the drop down menu. The Add Data dialog box will open on the left side of the box, expand <i>Portal</i> if necessary, then select <i>Living Atlas</i>. Type "soil hydrologic group" in the search box, browse to the layer then click OK.</li></ul></div><div style='margin:0px; padding:0px;'>In ArcGIS Pro you can use the built-in <a href='https://pro.arcgis.com/en/pro-app/help/data/imagery/raster-functions.htm' target='_blank' rel='nofollow ugc noopener noreferrer'>raster functions</a> or create your own to create custom extracts of the data. 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