This analysis results in acceptable pressures, until it is discovered that the industrial demand is not actually 500 gpm—it is 1,500 gpm. Because of the inheritance within the demand alternatives, however, only the Average Day demand for J-2 needs to be updated. The changes ripple through to the children. After the single change is made, the demand hierarchy is as follows:

Notice that no changes need to be made to the scenarios to reflect these corrections. The three scenarios can now be calculated as a batch to update the results.

When these results are reviewed, it is determined that the system does not have the ability to adequately supply the system as it was originally thought. The pressure at J-2 is too low under peak hour demand conditions.