Using the Segment ID table to select sub-catchments

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In this section you are going to use the segment ID table you created in the previous section to create a selection on a sub-catchment, this is very useful in finding what's upstream. The selection could be used to tally up network statistics or used in a spatial selection (e.g. used to select monitoring sites). An example using another network is described here but this walk-through will use the supplied sample data.