Enable subnetworks

Subnetworks are well-defined areas of connectivity in a database that either originate or terminate to a known set of features called subnetwork controllers. In a water system, subnetworks are used to model the connectivity and flow of a water system and, because they exist as features in your database, they can be used to organize, manage, and analyze your data. In this workflow, you will define subnetwork controllers, assign terminals, and create subnetworks.

Set subnetwork controllers

Subnetwork controllers define the origin or destination of a subnetwork. They are used in subnetwork management and specify how a resource flows through a network. Subnetwork controllers require terminals and are an important part of the utility network.

Set the water system subnetwork controller

In the workflow data, the subnetwork controller for the water system tier is the treatment plant. You will set this subnetwork controller, which will later be used to create the subnetwork. To set the subnetwork controller, complete the following steps:

1. If necessary, open the Water Essentials Network Asset Type map.
2. On the Map tab, in the Selection group, click Select by Attributes.
3. For Input Rows, choose Water Device\Treatment Plant.
4. Under Expression, build the following expression: Where Asset ID is equal to NS-7.
5. Click OK.

   The treatment plant is selected on the map.

6. On the Utility Network tab, in the Subnetwork group, choose Modify Controller.

   The Modify Subnetwork Controller pane appears.

7. In the Modify Subnetwork Controller pane, click Add Selected , and set the following parameters:
   1. For Terminal, choose Outlet Port.
   2. For Tier, choose Water System.
   3. For Subnetwork Controller Name, type Firemens Treatment Plant.
   4. For Subnetwork Name, type Naperville Water Distribution.
   5. For Description, type The treatment plant for the Naperville water distribution system.
8. Click Apply.
9. On the Utility Network tab, in the Network Topology group, click Validate .
10. On the Edit tab, in the Manage Edits group, click Save .

Set pressure zone controller

In the Water Utility Network Essentials, you can manage pressure zones in a separate tier. Pressure zones are controlled by their assigned subnetwork controllers. In this section, you will set the subnetwork controller for a pressure zone and will later use the controller to create the subnetworks. To set the subnetwork controller, complete the following steps:

1. If necessary, open the Water Essentials Network Asset Type map.
2. On the Map tab, in the Selection group, click Clear.
3. On the Map tab, in the Selection group, click Select by Attributes.
4. In the tool, set the following parameters:
   1. For Input Rows, choose Water Device\Pressure Valve.
   2. For Selection Type, choose New Selection.
   3. Under Expression, build the following expression: Where Asset ID is equal to WCVAL-6.
5. Click OK.
6. On the Utility Network tab, in the Subnetwork group, click Modify Controller.

   The Modify Subnetwork Controller pane appears.

7. In the Modify Subnetwork Controller pane, click Add Selected , and set the following parameters:
   1. For Terminal, choose Low Pressure Out.
   2. For Tier, choose Water Pressure.
   3. For Subnetwork Controller Name, type Charles Ave PRV.
   4. For Subnetwork Name, type 3000.
   5. For Description, type The pressure valve for the 3000 pressure zone.
8. Click Apply.
9. On the Utility Network tab, in the Network Topology group, click Validate .
10. On the Edit tab, in the Manage Edits group, click Save .

Create subnetworks

When a subnetwork is updated, information in the Subnetworks table, attributes on features, and objects are updated, and a subnetwork line in the SubnetLine feature class can be created or updated.

To calculate the subnetwork values, complete the following steps:

1. If necessary, open the Water Essentials Network Asset Type map.
2. In the Geoprocessing pane, click Toolboxes, expand System, expand Utility Network Tools, and click the Update Subnetwork tool.
3. In the tool, set the following parameters:
   1. For Utility Network, click the drop-down arrow and choose Network Utility Network.
   2. For Domain Network, choose Water.
   3. For Tier, choose Water System.
   4. For All Subnetworks in Tier, check the check box.
   5. For Continue on Failure, leave the check box unchecked.
4. Click Run.
5. Repeat this step, but change Tier to Water Pressure.

After running the tool, the subnetwork fields are populated with values of the subnetworks that they participate in. If a field shows Unknown, it could indicate that there is an issue in that area.

Check connectivity

Every feature in the line, device, and junction feature classes as well as every object in the domain network's junction object and edge object tables contains an Is connected attribute. This attribute helps identify isolated network features and objects by maintaining information about their connectivity to subnetwork controllers.

Update connectivity

You will use the Update Is Connected geoprocessing tool to update the is connected field.

To calculate the is connected attribute, complete the following steps.

1. If necessary, open the Water Essentials Network Asset Type map.
2. In the Geoprocessing pane, click Toolboxes, expand System, and expand Utility Network Tools, and then click the Update Is Connected tool.
3. In the tool pane, for Utility Network, select Network Utility Network from the drop-down menu.
4. Click Run.

After running the tool, the is connected fields are populated with values indicating their connectivity status.

Verify the connectivity

Once the is connected field has been populated you can use a query to help find areas of the network that may be disconnected.

To find potentially disconnected areas, complete the following steps.

1. If necessary, open the Water Essentials Network Asset Type map.
2. On the Map tab, in the Selection group, click Clear.
3. On the Map tab, in the Selection group, click Select by Attributes.
4. In the tool, set the following parameters:
   1. For Input Rows, choose Water Line\Water Main.
   2. For Selection Type, choose New Selection.
   3. Under Expression, build the following expression: Where Is Connected is equal to False.
5. Zoom to the selected features.

   Note:

   In this workflow, you ran a query against the Water Line\Water Main feature class. It is a good idea to check connectivity in all of your classes.

Fix the connectivity

In the previous step, you identified an area that was not connected to the network. In this section you will correct the disconnected section, and recalculate the connected attributes.

To fix the disconnected areas, complete the following steps.

1. With the area still selected from the previous workflow, zoom to the area where the neighborhood meets the main distribution line.

   You will notice that there is a line missing that connects the neighborhood to the main distribution line.

2. On the Edit tab, in the Features group, click Create.
3. In the Search box, type Distribution Main.
4. Scroll to Water Line : Water Main and click Distribution Main.
5. On the map, digitize a line between the tap and the valve, starting at the tap and ending at the valve.
6. Click the Finish button on the editing taskbar.
7. Click the Utility Network tab, and then in the Network Topology group, click Validate .
8. On the Edit tab, in the Manage Edits group, click Save .
9. On the Utility Network tab, in the Subnetwork group, choose Find.

   The Find Subnetworks pane appears.

10. Right-click the Water Distribution subnetwork and click Update Subnetwork.

In this workflow, you fixed the connectivity issue, and updated the subnetwork. When update subnetwork is run, the Is connected attribute is automatically updated for any portion of the network that participates in that subnetwork. Thus, your previously disconnected section is now calculated as connected.

This tutorial provided a detailed and structured approach to migrating geometric network data into the utility network using the Water Utility Network Foundation. By following the steps outlined in each section, you successfully navigated the data migration process, from preparing the project and data mapping to resolving network errors and creating subnetworks. You can apply the knowledge gained from this tutorial to migrate your own data to the utility network, ensuring a smooth transition.