What This Tutorial Covers

This tutorial serves as a hands-on guide for professionals using GeoSWMM, with a focus on the practical application of continuous simulation modeling for long-term stormwater system performance evaluation. It is intended for users who already have a working knowledge of hydrology, hydraulics, stormwater management modeling, model input data in ArcGIS Pro and the use of EPA SWMM elements and flow routing methods for representing drainage systems.

The tutorial walks users through the process of modeling a continuous simulation using long-term rainfall data for a stormwater drainage system and a detention pond designed in Tutorial 03 for a 48.78-acre residential site. It emphasizes key tasks such as incorporating evaporation rates and a continuous precipitation record into the simulation to assess long-term system performance. Users will also learn how to use GeoSWMM’s Statistics tool to analyze continuous simulation results and evaluate system behavior over a 10-year period. These skills are especially relevant for engineers and planners evaluating stormwater systems over time, considering factors like varying rainfall intensity, antecedent conditions, and evaporation effects.

Users will learn how continuous simulation addresses the limitations of synthetic design storms by incorporating real historical rainfall data. The tutorial also highlights how this approach provides a more robust and realistic understanding of long-term water balance and the hydrologic performance of stormwater management strategies, compared to traditional single-event simulations. This tutorial complements the GeoSWMM User’s Manual by offering a structured, example-driven walkthrough of real-world modeling scenarios.

The following section begins a step-by-step demonstration of the worked example project, guiding users through each stage of setting up and analyzing continuous simulations in GeoSWMM.