CivilStorm let's you choose between three different Active Numerical Solvers, each offers different runoff methods for catchments. You can change the Active Numerical Solver by opening the Analysis menu, select Calculation Options, and then double-click…

To add to Craig's response - the notable runoff methods with the Implicit and Explicit dynamic solvers in CivilStorm are the Unit Hydrograph Method, EPA-SWMM Runoff Method and the Modified Rational Method. For a large catchment area, the first two…