Setting up the risk ranking point data

This section is not applicable to Safeti Lite because risk ranking points are not available in Safeti Lite.

For this tutorial you will define two risk ranking points, as shown by the blue dots in the illustration:

1.At the group of four houses nearest to the boundary of the site.

2.At the village school.

Select the Risk ranking points folder in the Risk tab of the Study Tree, insert the two points, placing them in the GIS Input View, and name the nodes Nearest houses and School. Risk ranking points do not have any input data apart from their geographical location.

If you find that the population shapes are preventing you

from seeing the map image properly when you are placing the risk ranking points, you can hide the population shapes by right-clicking on the Population item in the Map Legend, and then selecting

Display Off from the right-click menu. The population shapes have been hidden in the illustration above.

Defining the Models and Populations Playlists for the two Run Rows

You have now completed all of the input data in the Study Tree, and the final step is to select the appropriate sets of input data for day and for night. This involves working in the Run row grid Supertab to define Playlists, which are selections of items of input data.

Defining a Models Playlist for the Day Run Row

A Models Playlist is a selection of Scenarios.

When you click in the Models cell for the Day Run Row, you will see that the cell changes to display a dropdown list and a Playlist Properties icon . You use the dropdown list to choose between the Models playlists that have been defined in the workspace.

There is currently a single Models Playlist called All. Each type of input data that uses a Playlist always has a Playlist called All defined, and this Playlist is selected by default for the first Run Run row in each new workspace, and for each new Run Row that you add to the grid. The All Playlist always has all relevant items selected (e.g. all Scenarios, or all Populations), and you cannot edit the definition of this Playlist.

For this tutorial, you will not use the All Models Playlist for the Day Run Row. The Models tab section of the Study Tree still includes the time-varying line rupture Scenario for the chlorine sphere, which you will keep in the workspace as background information, but this Scenario should not be included in the risk calculations because that would involve double-counting the risk for the line rupture. You will create a new Models Playlist called Day, with all Scenarios selected except the time-varying Scenario.

To create a new Playlist, click on the

Playlist Properties icon . The Run row grid will change to displaying the Playlist Editor, as shown. The All Playlist is selected, and this means that all of the Scenarios are in the Selected items list. It also means that the fields in the editor are disabled, as it is not possible to edit an All Playlist.

The Day Playlist will be very similar to the All Playlist, with just one Scenario deselected, and this means that the easiest way to create the Day Playlist is as a copy of the All Playlist.

To make the copy, click on the Copy icon above the Selected items list.

The fields in the editor will become enabled as shown, and the name of the new Playlist will be set by default to

Copy of All.

First, change the name to Day.

Next, check the box next to the timevarying Scenario under Chlorine, Saturated 10 degC, and click on the left arrow to remove it from the

Selected items list.

Finally, click on OK to close the editor and return to the Run Row table. You will see that the selection of Models

Playlist for the Day Run Row is now set to Day.

Defining a Models Playlist for the Night Run Row

The process is almost identical to the process for defining the Day Playlist:

1.Click on the Models cell for the Night Run Row.

2.Click on the Playlist Properties icon to open the Playlist Editor.

3.Click on the Copy icon to create the new Playlist as a copy of the All Playlist.

4.Set Night as the name of the new Playlist.

5.Deselect the time-varying chlorine Scenario and the chlorine tank wagon Route Model.

6.Click on OK to close the editor and return to the Run Row table.