While not specific to tailings, this webinar includes valuable knowledge for tailings engineers. This webinar demonstrates the differences between Level Pool reservoir routing and Dynamic reservoir routing for dam breach modeling. Though the concept would apply to any 1-d hydrodynamic model, this webinar is designed around HEC-RAS. Given its stability and ease-of-use, Level Pool routing can be a more cost effective way to simulate the drawdown of a reservoir during a dam breach event, when compared to the more accurate, yet more computationally demanding Dynamic routing. The required input is simply a definition of the reservoir's stage-storage relationship. Dynamic routing requires much more detail, including cross sections that represent the bathymetric terrain in the reservoir, and is prone to instabilities, which can require a great deal of time and effort to work out. While Level Pool reservoir routing is a convenient method to simulate dam breach reservoir drawdown, it is not always appropriate and if misused, can lead to significant errors in computing the dam breach outflow hydrograph. This webinar explains when, and under what circumstances a Level Pool analysis is appropriate for dam breach modeling and demonstrates the input requirements and geometry setup for both Level Pool and Dynamic routing in HEC-RAS.