We have started using SewerCAD to design our low pressure sewers. The consultants we have used in the past were using WaterCAD. They have told us they have to "trick" the program just like what GCIII was saying. I'm not crazy about trying to "trick" the program to get it to work for our application. Back in 2006 I did a little research on SewerCAD and found that it was better for us to use than WaterCAD. We went with SewerCAD that could be integrated with AutoCAD and that has worked very well because I can do the design and drafting at the same time. When I was finally able to get upper management to allow me to purchase SewerCAD it was version 5. It was supposed to be able to integrate with AutoCAD and we never could get it to integrate but later learned that it was compatible only up to AutoCAD 2002 and we were using 2008. SewerCAD just has released version 8 which is compatible with AutoCAD 2009. Since I've been using SewerCAD I have not had a problem with evaluating high spots in a line. I've not used WaterCAD so I can't help answer that. Don't mean to ramble but I hope this helps with your question.