In our example, the local planning board also requires analysis of maximum day demands, so a new demand alternative is required. No variation in demand is expected at J-2, which is an industrial site. As a result, the new demand alternative can inherit J-2’s demand from Average Day while the other two demands are overridden.

Now we can create a child scenario from Average Day that inherits the physical alternative, but overrides the selected demand alternative. As a result, we get the following scenario hierarchy:

Since no physical data (pipe diameters) have been changed, the physical alternative hierarchy remains the same as before.