Clear the Selected Features, then repeat this procedure for selecting the Catchment features that lie within the San Marcos basin. Remove the large coverages of Flowline and Catchment that you started with and display only the Flowlines and Catchments within the San Marcos Basin. This so clever as for the land cover distribution you have to recolor the process isn’t quite – newly added Flowlines and Catchments to make them blue and green respectively. This map looks a little bit like spaghetti, so recolor the Flowlines according to the Mean Annual Flow let’s (Q0001C attribute). Right click on the Flowline feature class and select Properties/Symbology. Use Graduated Symbols with Value Q0001C and click on Template to change the base color to blue. Turn on the display for the Subwatershed feature class. Now got a much more interesting you’ve map with the main river, called upstream the Blanco River and then downstream the San Marcos River. The tributary on the east side of the basin is Plum Creek. This is all laid out over a subdivision of the San Marcos basin by the HUC10 Watersheds. If you open up the Catchment Attribute Table and right click on the AreaSqKm attribute, you can determine the statistics of the Catchment areas. You can similarly summarize the attributes of Flowline feature class, such as the LengthKm attribute. Use the Basemap to find the town of Wimberley near the upper end of the basin You can use the Select tool to select a flowline, such as the one labelled with COMID = 1630223 (be sure to expand the field so you can see all the numbers in it) as shown in the diagram. If you similarly select the Catchment in this area, see you’ll
Clear the Selected Features, then repeat this procedure for selecting the Catchment features that lie within the San Marcos basin. Remove the large coverages of Flowline and Catchment that you started with and display only the Flowlines and Catchments within the San Marcos Basin. This process isn’t quite so clever as for the land cover distribution – you have to recolor the newly added Flowlines and Catchments to make them blue and green respectively. This map looks a little bit like spaghetti, so let’s recolor the Flowlines according to the Mean Annual Flow (Q0001C attribute). Right click on the Flowline feature class and select Properties/Symbology. Use Graduated Symbols with Value Q0001C and click on Template to change the base color to blue. Turn on the display for the Subwatershed feature class. Now you’ve got a much more interesting map with the main river, called upstream the Blanco River and then downstream the San Marcos River. The tributary on the east side of the basin is Plum Creek. This is all laid out over a subdivision of the San Marcos basin by the HUC10 Watersheds. If you open up the Catchment Attribute Table and right click on the AreaSqKm attribute, you can determine the statistics of the Catchment areas. You can similarly summarize the attributes of Flowline feature class, such as the LengthKm attribute. Use the Basemap to find the town of Wimberley near the upper end of the basin You can use the Select tool to select a flowline, such as the one labelled with COMID = 1630223 (be sure to expand the field so you can see all the numbers in it) as shown in the diagram. If you similarly select the Catchment in this area, you’ll see
Ex22015.docx