Find upstream and downstream features

You can find features upstream or downstream from a starting point in a trace network using the Trace tool with the Upstream or Downstream trace type set.

For more information, see Trace network trace types.

Requirements

To perform an upstream or downstream trace, the following requirements must be met:

• The network topology must be enabled.

• One or more starting points must exist.

Trace upstream features

To perform an upstream trace, complete the following steps:

1. Ensure that the trace network is added to an active map, and select the trace network or one of its related layers in the Contents pane.

   This enables the Trace Network tab and Data contextual tab on the ribbon.

2. Under Trace Network, click the Data tab.
3. On the Data tab, in the Tools group gallery, click Upstream.

   The Trace tool opens for the trace network in the active map using the upstream trace type, and the Input Trace Network parameter is populated with the trace network from the active map.

4. Ensure that one or more starting points exist in the map view. In the Tools group, click the Trace Locations command to open the Trace Locations pane. Set starting points and barriers to use in the trace.

   For upstream traces, at least one starting point must be set. Barriers are optional.

5. For the Starting Points parameter, use the TN_Temp_Starting_Points feature class populated by default, or select another feature class to use.
6. For the Barriers parameter, use the TN_Temp_Barriers feature class populated by default, or select another feature class to use.
7. Configure additional parameters as needed. Refer to the Trace tool for a full list of parameters.
8. Click Run.

Features upstream from the starting points are returned.

Trace downstream features

To perform a downstream trace, complete the following steps:

1. Ensure that the trace network is added to an active map, and select the trace network or one of its related layers in the Contents pane.

   This enables the Trace Network tab and Data contextual tab on the ribbon.

2. Under Trace Network, click the Data tab.
3. On the Data tab, in the Tools group gallery, click Downstream.

   The Trace tool opens for the trace network in the active map using a downstream trace type, and the Input Trace Network parameter is populated with the trace network from the active map.

4. Ensure that one or more starting points exist in the map view. In the Tools group, click the Trace Locations command to open the Trace Locations pane. Set starting points and barriers to use in the trace.

   For downstream traces, at least one starting point must be set. Barriers are optional.

5. For the Starting Points parameter, use the TN_Temp_Starting_Points feature class populated by default, or select another feature class to use.
6. For the Barriers parameter, use the TN_Temp_Barriers feature class populated by default, or select another feature class to use.
7. Configure additional parameters as needed. Refer to the Trace tool for a full list of parameters.
8. Click Run.

Features downstream from the starting points are returned.