About This Application Manual

This manual has been prepared to serve as one of the practical application guides for modelers; provided that they have already acquired the basics of hydrology, storm water management modeling and on how GeoSWMM’s hydraulic elements and flow routing methods are used to model a surface drainage system. Especially they must know how to develop a GeoSWMM model using GIS data, to set simulation options and prepare model input data in ArcGIS Pro, and to run simulation and interpret model results under different scenarios. Readers are recommended to keep GeoSWMM User's Manual aside in case they face difficulties during model building and simulation process. The User's Manual elaborately discusses working with a GeoSWMM model and its different settings.

This tutorial demonstrates how to model water quality treatment in the BMPs that were used in Tutorial 05 to control runoff from a new residential development. Here, treatment of total suspended solids (TSS) is applied at both the detention pond introduced in Tutorial 03 and the filter strips and infiltration trenches added in Tutorial 05. The pond from Tutorial 03 is re-designed to a smaller volume for this tutorial to account for the runoff reduction associated with the upstream infiltration trenches. TSS removal in the detention pond is modeled as an exponential function of time and water depth. TSS removal in the filter strips and infiltration trenches is a fixed percent reduction in loading.

In the next chapter, the worked-out tutorial with illustrations is detailed.