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.

As the first worked-out GeoSWMM project of the application manual, this tutorial demonstrates how to construct a hydrologic model of an urban catchment and use it to compare storm water runoff under undeveloped and post-development scenarios. Only subcatchment runoff has been simulated here which is one of the most important drainage concerns in urban development. This tutorial will help understanding rainfall-runoff phenomena, peak runoff characteristics, and the impact of increased surface imperviousness (resulted from urbanization process) on the peak and total runoff.

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