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1. If necessary, in the 'Filters' section on the left sidebar, toggle off Only search in Rice University, at which point the proper layer should appear.
   
   
   
   
2. Click the NFIE-Geo Regions web map.
   
   
   
   
3. On the right, click to Open in Map Viewer.
4. On the map, click to select the Texas-Gulf region, which encompasses Houston.
5. In the pop-up, click More info.
6. In the Content section, right-click the NFIEGeo_12.gdb.zip file and select Download.
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1. Navigate to the location where the zipped file has been downloaded.
2. Right-click the downloaded NFIEGeo_12.gdb. zip file and select Extract All….
3. In the ‘Extract Compressed (Zipped) Folders' window, click Extract.
4. In the new extracted folder window that opens, right-click the extracted NFIEGeo_12.gdb folder and select and Copy.
5. Navigate back to your HydrologyLab folder.
6. Paste the NFIEGeo_12.gdb folder directly inside your HydrologyLab folder. Do NOT paste them inside the HydrologylabHydrologyLab.gdb geodatabase.
7. Ensure that your HydrologyLab folder appears as shown below.
   
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8. Return to ArcGIS Pro.

Adding feature data in ArcMap

Unfortunately, any changes you make to files outside of ArcGIS Pro are not automatically reflected inside ArcGIS Pro. Since you just added new files to your HydrologyLab folder, you will need to refresh your HydrologyLab folder in order for them to appear.

1. In the Catalog Pane pane on the right of the map displayview, expand Folders, right-click your HydrologyLab folder, and select Refresh.
2. Expand the HydrologyLab folder > NFIEGeo_12.gdb geodatabase and the > Geographic feature dataset to preview what feature classes, or layers, it contains.

3. Drag the Geographic feature dataset

   on

   from the Catalog

   Pane

   pane into the

   Map Display.

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1. Lab1 map view.

If you ever close the Catalog window, causing the Catalog tab to disappear, pane, you can reopen it by clicking the View button tab on the Standard toolbar, navigating to the Windows menu and selecting ribbon and then clicking the Catalog Pane button.

The polygons in the Subwatershed layer represent all of the subwatersheds within the Texas-Gulf Coast Region 12, which you selected when initially downloading the data from the ArcGIS Online website. Now you will examine the attributes of this subwatershed data.

1. In the Table of Contents, right-click the Subwatershed layer and select Attribute Table. Expand the size of the table, if desired.

You will notice three of the columns are labeled HUC_8, HUC_10, and HUC_12, which correspond to the subbasin, watershed, and subwatershed codes respectively. HUC stands for hydrologic unit code, which is a unique identification number assigned to each hydrologic unit in the United States. Further to the right, you will see additional columns containing the actual names of the HUC-10 watersheds and HUC-12 subwatersheds.

1. Close the Subwatershed attribute table.

Adding an online basemap

First, you would like to identify the subwatersheds within the greater Houston region, but without any additional reference layers regarding streets or administrative boundaries, this would be very difficult to do. Fortunately, you can utilize various basemaps of the world hosted online by Esri, rather than having to obtain all of the GIS reference layers yourself. Because these basemaps are being hosted online, they cannot be edited and can sometimes be slow to load.

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1. In the ‘Basemap’ window, select the Topographic basemap.

Though the basemap appears in the background, it is obscured by the other data layers.

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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.
   
   
   
   

1. Select HUC-8, and is equal to, in the first two fields.
2. Type ‘12040104’  "12040104" in the last field.
   Verify that your ‘Select By Attributes’ pane appears as shown on the following page and click Add.
   
   
   
   
3. Click Run.
4. In the Table of Contents, right-click the Subwatershed layer and select Selection - > Zoom To Selection.
   
   

Exporting selected features

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1. In the Table of Contents, right-click the Subwatershed layer and select Data - > Export Features….

Notice that, by default, the ‘Export Data’ window is set to export only the selected features using the coordinate system of the data source. Also notice that the output feature class defaults to the HydrologyLab geodatabase, because you initially set this as your default geodatabase.

1. For ‘Output feature class:’, rename “Subwatershed Subwatershed_CopyFeatures” CopyFeatures to “SubwatershedsNew”“SubwatershedsNew”.
2. Ensure your ‘Copy Features’ window appears as shown below and click Run.
   
   
   
   

Since you’ve exported the particular subwatersheds of interest, you may now remove the master subwatersheds Subwatersheds layer from your map document.

1. Right-click the Subwatershed layer and select Remove.

Saving ArcGIS projects

At this point, it is a good idea to save your map document and to continue saving regularly.

1. On the Standard Quick Access toolbar, click the Save button.
   

At the top of the Table of Contents window, notice that the leftmost List By Drawing Order button is currently selected.

1. At the top of the Table of Contents, click the List By Source button.
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The Source tab displays the full file path locations of all the data layers referenced in your map document. By default, the map document will store this full file path to all of your data files.

1. At the top of the Table of Contents, click the List By Drawing Order button to return to the list of data layers.

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1. Next to the Map tab, click the Analysis tab and select Tools.
2. On the search bar, type "Dissolve" and press Enter. Double-click Dissolve (Data Management Tools).
   
   
   
   
3. In the top right corner of the ‘Dissolve’ window, click question mark icon.

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1. For ‘Input Features’, drag in the SubwatershedsNew layer from the Table of Contents or select the SubwatershedsNew option from the drop down box.
2. For ‘Output Feature Class’, rename the feature class from “SubwatershedsNew_Dissolve” to “Subbasin”.
3. For ‘Dissolve_Field(s)’, select the HUC_8 field, since this is the field containing the common subbasin value you wish to dissolve on.
4. Ensure your ‘Dissolve’ window appears as shown below, and click Run.
   
   
   
   
5. In the Table of Contents, toggle the new Subbasin layer off and on to get a better idea of the result of the Dissolve tool.
6. In the Table of Contents, right-click the Subbasin layer and select Attribute Table.

Notice that only the dissolve field, in this case the HUC_8 field, was preserved. Because multiple subwatersheds were dissolved into a single subbasin, it is not possible to retain all of the attributes of each separate subwatershed.

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1.  For ‘Color:’, use the drop-down menu to select No Color.
2. For ‘Outline Color:’, used the drop-down menu to select Black.
3. For ‘Outline Width:’, type “2” “2”.
4. Click Apply.

Now you would like to create a new layer based on the watersheds in the Buffalo-San Jacinto subbasin. In order to facilitate symbolization and labeling of the watershed names, you will now dissolve the subwatersheds into their respective watershed boundaries using the HUC-10 code.

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1. In the Table of Contents, uncheck the original SubwatershedsNew layer.
2. In the Table of Contents, drag the Subbasin layer above the Watersheds layer, so it is fully visible again.

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1. In the Table of Contents, right-click the Watersheds layer . Click and select Symbology.
2. Use the drop-down menu to select Unique values.
3. Use the ‘Value Field’ 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.
   
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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.Image Removed

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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1. On the main tab, click Insert - > New Layout - > ANSI Landscape - > Letter.
2. Click Insert tab and click Map Frame.
3. Select the Lab1 map under Map.
   

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1. In the Table of Contents, check the Flowline and Catchment layers to make them visible.

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Now you would like to select out only the flowlines within the Buffalo-San Jacinto subbasin, but this is not possible with an attribute query, so you will instead use a spatial query.

1. On the Main menu, select Select By Location….
2. For ‘Input Feature Layer’, use the drop-down menu to select Flowline.
3. For ‘Relationship’, use the drop-down menu to select "Have their center in".
4. For ‘Selecting Features’, check the Subbasin layers.

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1. Ensure your ‘Select by Location’ window appears as shown and click Run.
   
   

All of the flowlines catchment areas that are within the subbasin are now selected.

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1. If necessary, go to the Catalog window and click Layouts on top of the map display to get in layout mode.
2. Click the Insert tab. Select the drop down menu of Text and click Rectangle.
   
   
   
   
3. Drag a rectangle on your map layout to insert a rectangle text element.

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1. Open the Flowlines Symbology tab.
2. Use Symbology drop down menu to select Graduated symbols.
3. Use the ‘Field’ drop-down menu to select the Q0001C field, which contains the mean annual flow.
4. Click the line next to Template to change the symbology of your flowlines.
   
   
   
   
5. Save your map document.

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FOR MAP LAYOUT TO BE TURNED IN

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1. In the table of contents, check the StreamGages layer which you brought in at the beginning with the Geographic feature dataset from the NFIEGeo_12 Geodatabase.
2. On the Main menu, click Select By Location….
3. For ‘Input Feature Layer’, check the StreamGage layer.
4. For ‘Relationship’, use the drop-down menu to select within.
5. For ‘Selecting Features’, use the drop-down menu to select Subbasin.
6. Ensure your ‘Select by Location’ window appears as shown and click Run.
   
   

All of the stream gages that are within the subbasin are now selected.

1. Export the selected StreamGage features into your HydrologyLab geodatabase and name the new feature class “SubbasinStreamGages”“SubbasinStreamGages”.
2. Remove the original StreamGage layer from the Table of Contents.
3. Save your map documentproject.
4. When you are finished creating your layout, close ArcGIS Pro.
   
   

FOR MAP LAYOUT TO BE TURNED IN

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