source: github Introduction SWMM/XPSWMM is a widely used software that utilizes a node-link scheme for modeling drainage networks, particularly for underground pipe systems. …

source: github Introduction When building large hydrology models, you might find it easier to prepare the subcatchments input parameters in GIS or CAD software. Two commonly used methods to get external data into XPSWMM are “import from GIS” and “GIS Link”. …

Source: github Introduction The runoff from pervious areas can be highly dependent on the infiltration settings used in models like SWMM. To ensure accurate results, SWMM infiltration methods have undergone several major updates. …

source: github Introduction Evaporation usually is not a significant source of loss for models running a single design storm for system capacity analysis. However, for continuous simulation with a focus on water volume and quality, it can have significant impact on the modeling results. Evaporation happens when there is standing water…

When working with modeling software packages like XPSWMM or SWMM, text files are often used to store the models. Even software that uses a database to store the model, like InfoWorks ICM, may still use text files as an exchange format. As the size of the model grows, the text…

In part 1 we covered the basics of SCS hydrology (CN method and SCS UH), and in part 2 we showed how to set it up in XPSWMM and HEC-RAS. In this post we’ll go through the steps of setting up SCS hydrology in an InfoWorks ICM network. InfoWorks ICM subcatchment InfoWorks manages…

InfoWorks ICM Ground Infiltration simulates the complicated long term hydrological cycle of sewer infiltration over seasons. Most modelers with a Civil background are not familiar with these concepts, and here are a few diagrams to give you a fast start. Input Parameters

In part 1, we reviewed the basic ideas behind SCS hydrology method. In this post, we will setup a model in both XPSWMM and HEC-HMS. XPSWMM In XSWMM, for each subcatchment, you enter the following, · Area · Imp (%) · Shape factor · Initial abstraction · CN · Time of…

Introduction SCS hydrology is a widely used method for designing stormwater sewer. It is well documented in TR-55 and implemented in many software packages. HEC-HMS online help explains how it transforms the rainfall into hydrograph, · SCS curve number loss model · SCS Unit hydrograph routing model In the first step…