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While you could have also dissolved using the HU_10 field, the watershed name is probably more meaningful to you than the HU_10 code. You no longer need the original subwatersheds the SubwatershedsNew layer for this section. The rest of the analysis will be done with the new Watersheds layer.

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1. In the Contents pane, right-click the Watersheds layer and select Symbology.
2. In the Symbology pane, use the 'Primary symbology' drop-down menu to select Unique Values.
3. Use the ‘Field 1’ drop-down menu to select the HU_10_NAME field.
4. Use the ‘Color Scheme’ drop-down menu to select the color ramp of your choice.
   
   
5. On the bottom half of the Symbology pane, if only <all other values. shows up, click the Add all values button.

Notice that the subwatersheds from the previous layer have now been grouped into 8 watersheds within the Buffalo-San Jacinto subbasin.

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