Introduction

In this demonstration, we are going to demonstrate the Interdependent Network Analysis to compute the connection loss and service flow reduction of an interdependent network composed of an electric power network and water network. Alternatively, we could also compute the connection loss and service flow reduction for an electric power network and gas network.

Tutorial Example

This advanced tutorial is going to look at how the damage to one utility (a power network) could effect another utility (water network) that might rely on the power network to run, for example, water pumps. Because of this interdependency, looking at the physical damage to the water network is not enough to determine if it can still operate at full capacity after an earthquake event. Using the Interdependent Network Analysis, we can determine connection loss and service flow reduction. To get started, we will need to create a new scenario.

Create Scenario

Interdependent Network Analysis

First, we will need to determine the physical damage to our water network. To do this, go through the following steps:

Now that we have determined the damage to the water network, let's do the same for the power network.

One thing to note here is that our network dataset inputs (e.g. Memphis Electric Power Network for INA) contain both a link and a node dataset; however, Ergo can only display the links in the visualization view even though nodes are present as well. The drawback of this is that even though the Electric Power Utility Network Damage (Hazus Style) and the Water Utility Network Damage Analysis computed damage to both links and nodes, only the damage to the links can be displayed and viewed in the tabular view. The damage to the node dataset is there and will be used in the Interdependent Network Analysis even though they cannot be viewed. Now that we have our power network damage and water network damage, let's proceed to find what the effects are from their interdependencies.

After running the analysis, you should now have 4 new result tables under Scenario Data. You should have two connectivity loss tables, one for the water network and one for the power network and you should have two service flow reduction tables, one for the water network and one for the power network.

Results

Now that we have some results, let's open up the datasets to see what we have. The connectivity loss tables have the following 3 columns:

The service flow reduction tables have the following 3 columns: