In the Routing method properties dialogue, routing of flow as well as water level calculations can be included.
Routing can be used to model the hydraulics of upstream tributaries and secondary river branches, where the main concern is to route water to the main river system.
Routing is a simplified hydraulic calculation. Normally, simulation of hydrograph mitigation along a branch is based on the shallow water equations, which require cross section information. However, routing doesn't require such cross sections. The concept of routing is basically transformation of a hydrograph, i.e. calculating the modified hydrograph (different peak value and adjusted shape) at a given location based on the hydrograph at the upstream point and simple parameters.