What if I use the pre/post scenario creation tool but want to go back and add another return event?
If you had used the Pre/Post Scenario Creation tool at some point in the past, but later want to add another return event, you’ll need to add a new rainfall runoff alternative and two new scenarios. First, go to Analysis > Alternatives and expand the Rainfall Runoff Alternative. Right click on the base rainfall runoff alternative, choose New > Child Alternative and give it a name corresponding to your new return event. For example, you may already have a ’10 year’ base alternative with ’25 year’ and ‘100 year’ child scenarios. If you were adding the 50 year scenario as a child to the 10 year, it would show up on the same ‘level’ as the 25 and 100. Next, click Analysis > Scenarios, right click the base predeveloped scenario, choose New > Child scenario and name it appropriately. Double click the new scenario and assign the newly created rainfall runoff alternative. For example, if you had just added a 50-year rainfall runoff alternative, select it as the “rainfall runoff” alternative fo
