About This Application Manual

This tutorial illustrates the simulation of pollutant buildup and washoff processes within an urban catchment using GeoSWMM. It considers the effects of varying land use on pollutant accumulation and applies empirical equations, such as Exponential functions (EXP) or Event Mean Concentration (EMC).

Surface runoff quality plays a critical role in evaluating the environmental impact of wet-weather flows; however, accurately modeling this aspect is challenging due to limited understanding of pollutant transport mechanisms and insufficient calibration data. GeoSWMM addresses these challenges by offering an empirical framework for simulating nonpoint source pollutant loading and evaluating treatment performance. In this tutorial, both Event Mean Concentrations (EMCs) and Exponential functions (EXP) are used to model the washoff behavior during storm events.

With flexible mathematical formulations, GeoSWMM enables users to calibrate pollutant accumulation during dry periods and simulate pollutant transport in stormwater runoff. The same study area featured in Tutorials 05 is used here to demonstrate how these pollutant dynamics can be effectively modeled in an urban setting.

In the next chapter, this document will describe the worked-out tutorial with illustration.