HYDROLOGIC-HYDRODYNAMIC ASSESSMENT OF DESIGN PEAK DISCHARGES USING THE EPA SWMM

The EPA S.W.M.M. model is a dynamic rainfall-runoff simulation model used to simulate the quantity and quality of runoff for a single event or over the long term (continuously), primarily in urban areas. The runoff component of S.W.M.M. operates on a collection of subcatchment areas that receive precipitation and generate the corresponding runoff. The routing component of S.W.M.M. conveys this runoff through a system of pipes, channels, storage facilities, pumps and gates. S.W.M.M. determines the quantity and quality of runoff generated within each catchment area, as well as the flow rate and flow depth in each pipe and channel during a simulation period composed of multiple time steps. This model enables a more accurate determination of the time of concentration and, consequently, the peak discharge, thereby supporting improved design of the relevant structures. The hydrodynamic modelling of the new Vlora Airport is presented as an example.