When analyzing, switch among multiple solvers, according to the type of system you are using. To solve the Saint Venant equations, choose between SewerGEMS’ explicit EPA solver based on SWMM and the implicit dynamic wave engine. These two dynamic engines account for storage effects within structures and quantify overflows should they occur. The convex/gradually varied flow solver uses convex routing to determine gravity sewer flows and gradually varied flow (backwater analysis) to determine hydraulic properties once the flow is known. With the rational/gradually varied flow solver, peak flows in the storm sewer system are calculated using the rational method. Use this solver to analyze peak flow conditions, or to automatically design storm sewers.