Figure 1-2 shows the proposed development for this site. This undeveloped area is primarily pasture land that has a silt loam soil type. To meet environmental sustainability objectives, similar criteria are being applied to total runoff volume as well.įigure 1-1 is a contour map of a 29 acre natural catchment area where a new residential development is planned. Many local stormwater ordinances and agencies require that new developments limit peak runoff flows relative to those under pre-development conditions. Models of this type are very common in practice. Flow routing of runoff through the drainage pipes and channels contained within the catchment is addressed in Example 2. It illustrates the process of spatially dividing a catchment into smaller computational units, called Subcatchments, and discusses the characteristics of these Subcatchments that InfoSWMM H2OMap SWMM InfoSWMM SA uses to transform rainfall into runoff. ![]() ![]() This first example demonstrates how to construct a hydrologic model of an urban catchment and use it to compare stormwater runoff under both pre- and post-development conditions. Post-Development Runoff in InfoSWMM and InfoSWMM SA
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