Real World Scenario The real world scenario I will use is a model created by the United States Environmental Protection Agency (EPA). This is a Stormwater Management Model (SWMM). This model is used worldwide for planning, analysis, and design related to stormwater runoff combined with sanitary sewers and other drainage systems in urban areas (Huber, 1988:1). The stormwater management model can also be used in non-urban areas. This model is primarily used to perform urban runoff analysis and can be broken down into several components, much like the real-world model. These components are: - preliminary screening models models. Computers are not used in this model but are used to determine the extent of runoff and quality problems in the areas. - Planning models used for an overall assessment of the urban runoff problem, as well as the quality and costs of the procedures (Huber, 1988:2). -Design models that simulate storm events to get an idea of ​​what happens during these events (Huber,