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1. In the Table of Contents, click the Subwatershed layer to select it.
2. On the ribbon, click the Feature Layer contextual Appearance Tab tab.Image Removed
3. Under effectsIn the Effects group, type “60”  “60” to change the transparency of the layer.
   
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Now the basemap should be visible beneath the subwatersheds.

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Ultimately, you want to select all of the subwatersheds that lie within the Buffalo-San Jacinto subbasin in which Houston is located, but first you will need to look up the HUC-8 code corresponding to this subbasin.

1. On the ribbon, click the Map tab and ensure that the Explore tool is selected.
2. Use the navigation tools to zoom in to the Houston region. On the Tools toolbar, make sure that the Explore tool is on.
3. In Map Displaythe map view, click near the center of Houston.

In the ‘Identify’ ‘Pop-up’ window, notice that the HUC_8 field contains the code 12040104, which corresponds to the Buffalo Bayou-San Jacinto subbasin. The first two digits (12) stand for the region (Texas-Gulf Region). The next two digits (1204) stand for the subregion (Galveston Bay-San Jacinto). The next two digits (120401) stand for the basin (San Jacinto). The last two digits (12040104) stand for the subbasin (Buffalo-San Jacinto). The additional two digits added to create the HUC-10 and HUC-12 codes stand for the watershed and subwatershed, respectively.

1. Close the pop'Pop-up' window.

Performing an attribute query

Now you are ready to perform an attribute query to select all of the subwatersheds within the Buffalo-San Jacinto subbasin (HUC-8 = 12040104).

1. On the Map tab,  select Select click the Select by Attributes….
   
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1. In the Geoprocessing pane, use ‘Layer Name or Table View’ drop-down menu to select Subwatershed.
2. Use the ‘Selection Type’ drop-down menu to select New selection.
3. Click Add Clause.
   
   
   
   

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