If you're in the US, you could check your local transportation department or regulatory authority to see if they offer any classes. In Virginia, for example, the VDOT Transportation Training Academy occasionally offers a two-day HEC-RAS course (for a fee). It's not enough to become an expert or...
@kornolio Your point about financial hardship not being a valid basis for a variance is a good one.
That being said, is the 16-inch pipe large enough to accommodate the additional backwater from the 10-inch pipe? If the pipe needs to be 16 inches just to carry the design storm, methinks they...
When you say "urban routing", do you just mean a worked out example of how to fill out one of those pipe calculation tables? Or are you talking an urban system that has detention facilities (ponds, etc.) that you are trying to incorporate?