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1. On the ribbon, click the Map tab.
2. In the Selection group, click the Select By Location button.
3. For ‘Input Features’, use the drop-down menu to select  the Flowline layer.
4. Use the second 'Input Features' drop-down menu to select the Catchment layer.
5. For ‘Relationship’, use the drop-down menu to select "Have their center in".
6. For ‘Selecting Features’, check the Subbasin layers.
7. . (This setting ensures that catchments and flowlines which share the outside border with the subbasin will not also get selected.)
8. For ‘Selecting Features’, use the drop-down menu to select the Subbasin layer.
9. Ensure your ‘Select by Location’ window appears as shown below and click RunOK.
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All of the flowlines and catchment areas that are within the subbasin are now selected.

1. Export the selected Flowline features into your HydrologyLab geodatabase and name the new feature class “Flowlines”.
2. Remove the original Flowline layer from the Contents pane.
3. Repeat step 1-7 using Catchment layer as Input Feature Layer and name the new Export the selected Catchment features into your HydrologyLab geodatabase and name the new feature class “Catchments”.
4. Remove the original Catchment layer from the Contents pane.
5. Uncheck the new Uncheck the Catchments layer, so it is no longer visible.

Symbolizing features using a single symbol

1. In the Contents pane, click the line symbol beneath the Flowlines layer name.
2. In the ‘Symbology’ window under Gallery, At the top of the Symbology pane, click the Gallery tab and select the Water (line) symbol.

Calculating summary statistics for an attribute table field

1. Open the FlowlinesFlowlines attribute table.
2. RightScroll right to the 8th field and right-click the LENGTHKM field name and select Statistics….

Symbolizing features using a single symbol

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1. Statistics.

From the ‘Statistics of Flowlines’ window Chart Properties pane on the right of map display, you can see there are 543 flowlines in the Buffalo-San Jacinto basin whose average length is 1.94 km and total length is 1052 km.

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