![]() ![]() ![]() Easy to build a model without the need of estimating TOC or selecting a UH transform method, however, not every regulating agency approves its use.Some thoughts on SWMM nonlinear reservoir runoff method. “Routing model” needs to be selected as “SWMM” which means SWMM nonlinear reservoir runoff method. “Runoff routing value” is NOT used for some other routing models widely used in the United States and its value can be simply set as 1.0 for these routing methods. As shown in Figure 6, “Runoff routing value” is for Manning’s n of overland flow of SWMM nonlinear reservoir runoff method. The impervious areas can be modeled by a runoff surface using “Fixed” runoff volume type with the fixed runoff coefficient of 1.0. ![]() In InfoWorks ICM, the 3 subareas of EPA SWMM need to be defined as three separate runoff surfaces in subcatchment grid window ( Figure 6), but again, you don’t need to create all of them at the same time if not needed. Before creating a subcatchment with SWMM nonlinear reservoir runoff method, it is beneficial to read through this post to have a general idea on how subcatchment hydrology works in InfoWorks. InfoWorks ICM has the capability to apply SWMM nonlinear reservoir runoff method to a subcatchment, however, its implementation is not as straightforward as EPA SWMM or XPSWMM.
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